Ingersoll-Rand M951P040BU24AA Assembly instructions

© 2012 Ingersoll Rand All Rights Reserved
Upflow/Horizontal, Downflow/ Horizontal, Gas-Fired, Direct Vent
Condensing Furnaces
INSTALLER'S GUIDE
M95 Upflow models can also be used in the
Horizontal Left configuration.
M95 Downflow models can also be used in the
Horizontal Right configuration.
A341624P16
M95 Furnace
18-CD35D1-4
OPTIONAL ACCESSORIES
Model Number Description
BAYBASE205 Downflow subbase for downflow models only
BAYFLTR200 External side filter rack
BAYFLTR203 Filter kit horizontal for 17.5" cabinet
BAYFLTR204 Filter kit horizontal for 21" cabinet
BAYFLTR205 Filter kit horizontal for 24.5" cabinet
BAYFLTR317 Cleanable filter for 17.5" cabinet upflow only
BAYFLTR321 Cleanable filter for 21" cabinet upflow only
BAYFLTR324 Cleanable filter for 24.5" cabinet upflow only
BAYLPKT210B Propane conversion kit
BAYLPSS210B LP kit with stainless steel burners
BAYMFGH100A Manufactured / mobile home kit
BAYRACK960A Internals filter rack kit for upflow models
BAYAIR30AVENTA Concentric vent kit for 2,2.5,3" vent system
BAYVENT200B Sidewall vent termination kit for direct vent furnaces
BAYVENT500A Side vent kit for downflow models only
BAYSWT01AHALTA High altitude switch kit - UF/DF 040, DF 085
BAYSWT04AHALTA High altitude switch kit - UF 060, 100, UF 120
BAYSWT05AHALTA High altitude switch kit - UF 080, 100, DF 110
BAYSWT12AHALTA High altitude switch kit - DF 065
KIT09224 Filter clip kit
BAYBRCKFLT10 Downflow bracket kit
ALL phases of this installation must comply with
NATIONAL, STATE AND LOCAL CODES
IMPORTANT—This Document is customer property and is to
remain with this unit. Please return to service
information pack upon completion of work.
M951P040BU24AA
M951P060BU36AA
M951P080BU42AB
M951P100CU48AA
M951P100DU60AA
M951P120DU60AA
M951P040BD24AA
M951P065BD42AA
M951P085CD48AA
M951P110DD60AA

2 18-CD35D1-4
INSTALLER’S GUIDE
INSTALLATION INSTRUCTIONS
SAFETY SECTION
The following safety practices and precautions must be followed
during the installation, servicing, and operation of this furnace.
1. Use only with the type of gas approved for this furnace.
Refer to the furnace rating plate.
2. Install this furnace only in a location and position
as specied in “Location and Clearances” of these
instructions.
3. Provide adequate combustion and ventilation air to the
furnace space as specied in “Air for Combustion and
Ventilation” of these instructions.
4. Combustion products must be discharged outdoors.
Connect this furnace to an approved vent system only, as
specied in the “Venting” section of these instructions.
5. Never test for gas leaks with an open ame. Use a
commercially available soap solution made specically
for the detection of leaks to check all connections, as
specied in “Gas Piping” of these instructions.
6. Always install the furnace to operate within the
furnace’s intended temperature-rise range with a duct
system which has an external static pressure within the
allowable range, as specied on the unit rating plate.
Airow with temperature rise for CFM versus static is
found in Service Facts document M951-SF-x.
7. When a furnace is installed so that supply ducts carry
air circulated by the furnace to areas outside the space
containing the furnace, the return air shall also be
handled by a duct(s) sealed to the furnace casing and
terminating outside the space containing the furnace.
8. A gas-red furnace for installation in a residential
garage must be installed as specied in “Location and
Clearances” section, of these instructions.
9. The furnace may be used for temporary heating of
buildings or structures under construction only when
the following conditions have been met:
The furnace venting system must be complete and
installed per manufacturer’s instructions.
The furnace is controlled only by a room thermostat
(no eld jumpers).
The furnace return air duct must be complete and
sealed to the furnace and clean air lters are in
place.
The furnace input rate and temperature rise must be
veried to be within nameplate marking.
100% of the furnace combustion air requirement
must come from outside the structure.
The furnace return air temperature range is between
55 and 80 degrees Fahrenheit.
Clean the furnace, duct work, and components upon
substantial completion of the construction process,
and verify furnace operating conditions including
ignition, input rate, temperature rise and venting,
according to the manufacturer’s instructions.
10. This product must be gas piped by a Licensed Plumber
or Gas Fitter in the Commonwealth of Massachusetts.
▲
WARNING
!
CARBON MONOXIDE POISONING HAZARD
Failure to follow the steps outlined below for
each appliance connected to the venting system
being placed into operation could result in carbon
monoxide poisoning or death.
The following steps shall be followed for each appliance
connected to the venting system being placed into
operation, while all other appliances connected to the
venting system are not in operation:
Seal any unused openings in the venting
system.
1. Inspect the venting system for proper size and
horizontal pitch, as required in the National Fuel Gas
Code, ANSI Z223.1/NFPA 54 or the CAN/CGA B149
Installation Codes and these instructions. Determine
that there is no blockage or restriction, leakage,
corrosion and other deficiencies which could cause
an unsafe condition.
2. As far as practical, close all building doors and
windows and all doors between the space in which
the appliance(s) connected to the venting system are
located and other deficiencies which could cause an
unsafe condition.
3. Close fireplace dampers.
4. Turn on clothes dryers and any appliance not
connected to the venting system.Turn on any exhaust
fans, such as range hoods and bathroom exhausts, so
they are operating at maximum speed. Do not operate
a summer exhaust fan.
5. Follow the lighting instructions. Place the appliance
be-ing inspected into operation. Adjust the thermostat
so appliance is operating continuously.
6. If improper venting is observed during any of the
above tests, the venting system must be corrected
in accordance with the National Fuel Gas Code,
ANSI Z221.1/NFPA 54 and/or CAN/CGA B149
Installation Codes.
7. After it has been determined that each appliance
connected to the venting system properly vents where
tested as outlined above, return doors, windows,
exhaust fans, fireplace dampers and any other gas-
fired burning appliance to their previous conditions of
use.

18-CD35D1-4 3
INSTALLER’S GUIDE
INSTALLATION INSTRUCTIONS..........2
General Installation Instructions ....................................... 3
Location and Clearances.................................................. 4
Outline Drawings .............................................................. 5
Upflow Installation ............................................................ 7
Downflow Installation........................................................ 7
Horizontal Installation ....................................................... 7
Air for Combustion and Ventilation.................................... 8
Duct Connections ........................................................... 10
Return Air Filters ............................................................ 11
General Venting .............................................................. 12
Venting Material.............................................................. 13
Venting Tables................................................................. 14
Horizontal Venting........................................................... 16
Horizontal Venting Through Wall..................................... 16
Venting Through Roof..................................................... 18
Venting Through A Masonry Chimney ............................ 21
Downward Venting.......................................................... 21
Electrical Connections.................................................... 27
Gas Piping...................................................................... 29
Combustion and Input Check ......................................... 30
START UP AND ADJUSTMENT..........33
Preliminary Inspections .................................................. 33
Lighting Instructions ....................................................... 33
Sequence of Operation................................................... 34
Control and Safety Switch Adjustments ......................... 34
Airflow Adjustment.......................................................... 34
ABNORMAL CONDITIONS .................36
IFC Error Flash Code ..................................................... 36
GENERAL INSTALLATION
INSTRUCTIONS
The manufacturer assumes no responsibility for equipment
installed in violation of any code or regulation.
It is recommended that Manual J of the Air Conditioning
Contractors Association (ACCA) or A.R.I. 230 be followed
in estimating heating requirements. When estimating heating
requirements for installation at altitudes above 2000 ft.,
remember the gas input may need to be reduced (See High
Altitude Installation).
Material in this shipment has been inspected at the factory
and released to the transportation agency without known
damage. Inspect exterior of carton for evidence of rough
handling in shipment. Unpack carefully after moving
equipment to approximate location. If damage to contents
is found, report the damage immediately to the delivering
agency.
Codes and local utility requirements governing the installation of
gas red equipment, wiring, plumbing, and ue connections must
be adhered to. In the absence of local codes, the installation must
conform with latest edition of the National Fuel Gas Code ANSI
Z223.1 • National Installation Code, CAN/CGA B149.1. The
latest code may be obtained from the American Gas Association
Laboratories, 400 N. Capitol St. NW, Washington D.C. 20001.
1-800-699-9277 or www.aga.org
These furnaces have been classied as CATEGORY IV furnaces
in accordance with latest edition of ANSI Z21.47 • CAN/ CGA
2.3 standards.
Category IV furnaces operate with positive vent static pressure
and with a ue loss less than 17 percent. These conditions require
special venting systems, which must be gas tight and water
tight. These Category IV Direct Vent furnaces are approved for
installation in Manufactured/ Mobile housing when used with
BAYMFGH100A.
▲WARNING
!
FIRE OR EXPLOSION HAZARD
Failure to follow the safety warnings exactly could
result in serious injury, death or property damage.
Improper servicing could result in dangerous
operation, serious injury, death, or property
damage.
Safety signal words are used to designate a degree or level of
seriousness associated with a particular hazard. The signal
words for safety markings are WARNING and CAUTION.
WARNING indicates a potentially hazardous
situation which, if not avoided, could result in death
or serious injury.
CAUTION indicates a potentially hazardous
situation which, if not avoided, may result in minor
or moderate injury. It is also used to alert against
unsafe practices and hazards involving only property
damage.
Contents

4 18-CD35D1-4
INSTALLER’S GUIDE
LOCATION AND CLEARANCES
The location of the furnace is normally selected by the architect,
the builder, or the installer. However, before the furnace is moved
into place, be sure to consider the following requirements:
1. Is the location selected as near the vent and as centralized
for heat distribution as practical?
2. Do all clearances between the furnace and enclosure
equal or exceed the minimums shown in the Table 1.
3. Is there sufcient space for servicing the furnace and other
equipment? A minimum of 24 inches front accessibility
to the furnace must be provided. Any access door or
panel must permit removal of the largest component.
4. Are there at least 3 inches of clearance between the
furnace front panel and any closed panel or door
provided?
5. Are the ventilation and combustion air openings large
enough and will they remain unobstructed? If outside
air is used, are the openings set 12" minimum above
the highest snow accumulation level (18" in Canadian
applications)?
6. Allow sufcient height in supply plenum above or below
the furnace to provide for cooling coil installation if the
cooling coil is not installed at the time of this furnace
installation.
7. A furnace shall be installed so electrical components are
protected from water.
8. If the furnace is installed in a residential garage, it must
be installed so that the burners and the ignition source are
located not less than 18 inches (46 cm) above the oor
and the furnace must be located or protected to avoid
physical damage from vehicles.
IMPORTANT: The furnace must be installed
level. The only allowable variation would be
slightly to the left and/or forward in upflow
installations or slightly toward the front in
horizontal installations. This is necessary for
proper condensate drainage.
NOTE: On upflow 5 ton airflow models where the
airflow requirement exceeds 1800 CFM - Models
will require return air openings and filters on: (1)
both sides; or (2) one side and the bottom; or (3)
just the bottom.
▲
CAUTION
!
To prevent shortening its service life, the furnace
should not be used as a “Construction Heater”
during the finishing phases of construction
until the requirements listed in item 9, a-g of the
safety section of this publication have been met.
Condensate in the presence of chlorides and
fluorides from paint, varnish, stains, adhesives,
cleaning compounds, and cement create a
corrosive condition which may cause rapid
deterioration of the heat exchanger.
▲
CAUTION
!
Do NOT install the furnace in a corrosive or
contaminated atmosphere.
▲WARNING
!
EXPLOSION HAZARD!
PROPANE GAS IS HEAVIER THAN AIR AND MAY
COLLECT IN ANY LOW AREAS OR CONFINED
SPACES. IN ADDITION, ODORANT FADE MAY
MAKE THE GAS UNDETECTABLE EXCEPT WITH
A WARNING DEVICE. IF THE GAS FURNACE IS
INSTALLED IN A BASEMENT, AN EXCAVATED
AREA OR A CONFINED SPACE, IT IS STRONGLY
RECOMMENDED TO CONTACT A GAS SUPPLIER
TO INSTALL A GAS DETECTING WARNING
DEVICE IN CASE OF A GAS LEAK.
NOTE: The manufacturer of your furnace does not
test any detectors and makes no representations
regarding any brand or type of detector

18-CD35D1-4 5
INSTALLER’S GUIDE
M95 OUTLINE DRAWING, UPFLOW / HORIZONTAL
(ALL DIMENSIONS ARE IN INCHES)
1. DIAMETER OF VENT PIPE MAY BE LIMITED TO 2-1/2” OR 3” ON SOME MODELS AT DIFFERENT ALTITUDES. REFER TO THE VENT LENGTH TABLE FOR PROPER APPLICATION.
MODEL DIM "A" DIM"B" DIM "C" DIM "D" DIM "E" DIM "F"
M951P040BU24AA* M951P060BU36AA* M951P080BU42AB*
17-1/2" 2-1/4" 16-1/4" 16" 7-1/2" 2"
M951P100CU48AA* 21" 2-1/2" 19-3/4" 19-1/2" 9" 3" M951P100DU60AA* M951P120DU60AA* 24-1/2" 2-15/16" 23-1/4" 23" 10" 3"
*15th digit is a service code and may be A-Z

6 18-CD35D1-4
INSTALLER’S GUIDE
M95 OUTLINE DRAWING, DOWNFLOW / HORIZONTAL
(ALL DIMENSIONS ARE IN INCHES)
MODEL DIM "A" DIM"B" DIM "C" DIM "D"
M951P040BD24AA* M951P065BD42AA* 17-1/2" 2-1/4" 16-1/4" 16" M951P085CD48AA* 21" 2-1/2" 19-3/4" 19-1/2" M951P110DD60AA* 24-1/2" 2-15/16" 23-1/4" 23"
*15th digit is a service code and may be A-Z

18-CD35D1-4 7
INSTALLER’S GUIDE
UPFLOW INSTALLATION
The cased coil must be secured to the furnace and both the
furnace and the cased coil must be properly supported.
The coil is always placed downstream of the furnace airow.
DOWNFLOW INSTALLATION
▲
WARNING
!
Do NOT install the furnace directly on carpeting,
tile or other combustible material other than
wood flooring. For vertical downflow application,
subbase (BAYBASE205) must be used between
the furnace and combustible flooring. When the
downflow furnace is installed vertically with a
cased coil, a subbase is not required.
Required oor opening:
SUBBASE CROSS SECTION
2
TABLE 1
CABINET
WIDTH
RETURN
DUCT
WIDTH
FLOOR OPENING PLENUM OPENING
"A" "B" "C" "D"
17-1/2" 16-1/4" 16-5/8" 20-1/8" 15-5/8" 19-3/8"
21" 19-3/4" 20-1/8" 20-1/8" 19-1/8" 19-3/8"
24-1/2" 23-1/4" 23-5/8" 20-1/8" 22-5/8" 19-3/8"
FURNACE
FRONT
A (width)
B (depth)
C
D
3
HORIZONTAL INSTALLATION
The coil and furnace must be fully supported when used in the
horizontal position. It is always recommended that an auxiliary
drain pan be installed under a horizontally installed evaporator
coil or 95% gas furnace. Connect the auxiliary drain line to a
separate drain line (no trap is needed in this line).
Installing the three brackets (with screws) that are included in
donwow furnaces will stabilize and secure the furnace and
cased coil in the horizontal position. See Figure 4.
IMPORTANT: The cased coil must be placed
downstream of the furnace. In horizontal
installations, the apex of the coil may point
either toward or away from the furnace. See the
coil Installer's Guide for more details.
The cased coil is secured to the furnace and both the furnace and
the cased coil must be properly supported. If used, the brackets
mount using the rear screws on the coil case and use the screws
provided to secure the bracket to the furnace. The remaining
bracket is placed as close to center as possible (horizontally)
between the coil case front and the furnace bottom channel (for
downow/horizontal furnace). Use four of the screws provided to
secure the bracket. The upow furnace, converted to horizontal,
aligns and attaches the coil as in Figure 1. However, the coil
requires additional support.
DOWNFLOW ONLY
CASED COIL CONNECTION
BRACKET FOR DOWNFLOW
FURNACE IN HORIZONTAL
4
The furnace may be installed in an attic or crawl space in the
horizontal position by placing the furnace on the left side (as
viewed from the front in the vertical position). The horizontal
furnace installation in an attic should be on a service platform
large enough to allow for proper clearances on all sides and
service access to the front of the furnace (See Figure 3 and Table
1). Line contact is only permissible between lines formed by
intersections of the top and two sides of the furnace casing and
building joists, studs, or framing.

8 18-CD35D1-4
INSTALLER’S GUIDE
5
UPFLOW/
HORIZONTAL
SHOWN
6" Minimum
The furnace may be placed horizontally in a crawl space on a
pad or other noncombustible material which will raise the unit
for sufcient protection from moisture. The furnace must be
supported at both ends and the middle when installed horizontally.
The furnace must also be elevated a minimum of 6 inches to
allow clearance for the condensate drain to exit the cabinet in the
horizontal position.
The horizontal furnace may also be suspended from the joists
using 3/8" all-thread rods with pieces of angle iron underneath
the furnace to form a hanging rack at both ends and the midpoint.
The rods need to be of sufcient length to allow for proper
clearances from combustible materials. The angle iron needs to
be at least 32" in length to allow for access to service panels.
50 CU. FT. OR MORE
PER 1000 BTU/HR. INPUT
ALL EQUIP. INSTALLED
UNCONFINED
6
AIR FOR COMBUSTION AND
VENTILATION
If these furnaces are installed in a non-direct vent capacity then
the adequate ow of combustion and ventilating air must not be
obstructed from reaching the furnace. Air openings provided for
combustion air must be kept free of obstructions which restrict
the ow of air. Airow restrictions affect the efciency and safe
operation of the furnace. Keep this in mind should you choose
to remodel or change the area which contains your furnace.
Furnaces must have a free ow of air for proper performance.
Provisions for combustion and ventilation air shall be made in
accordance with latest edition of Section 5.3, Air for Combustion
and Ventilation, of the National Fuel Gas Code, ANSI Z223.1 —
CAN/CGA B149.1 or applicable provisions of the local building
codes. Special conditions created by mechanical exhausting of
air and replaces must be considered to avoid unsatisfactory
furnace operation.
OUTSIDE AIR IS RECOMMENDED
The use of indoor air for most applications is acceptable, unless
there is the presence of corrosive chemicals or contamination.
Certain types of installation will require the use of outside air for
combustion.
The following types of installations will require use of
OUTDOOR AIR for combustion, due to chemical exposures:
• Commercial buildings
• Buildings with indoor pools
• Furnaces installed in “conned” laundry rooms
• Furnaces installed in “conned” hobby or craft rooms
• Furnaces installed near chemical storage areas.
Exposure to the following substances in the combustion air
supply will also require OUTDOOR AIR for combustion:
• Permanent wave solutions
• Chlorinated waxes and cleaners
• Chlorine based swimming pool chemicals
• Water softening chemicals
• Deicing salts or chemicals
• Carbon Tetrachloride
• Halogen type refrigerants
• Cleaning solvents (such as perchloroethylene)
• Printing inks, paint removers, varnish, etc.
• Hydrochloric acid
• Cements and glues
• Antistatic fabric softeners for clothes dryers
• Masonry acid washing materials
Furnace locations may be in a “conned space” or an
“unconned space”.
Unconned space is dened in Figure 6. These spaces may
have adequate air by inltration to provide air for combustion
and ventilation. Buildings with tight construction (for example,
weather stripping, heavily insulated, caulked, vapor barrier, etc.)
may need additional air to be provided as described for conned
space.
Conned spaces are installations with less than 50 cu. ft. of
space per 1000 BTU/hr input from all equipment installed, as in
Figure 7. Air for combustion and ventilation requirements can
be supplied from inside the building as in Figure 8 or from the
outdoors, as in Figure 9.

18-CD35D1-4 9
INSTALLER’S GUIDE
TABLE 2
MINIMUM AREA IN SQUARE FEET
FOR UNCONFINED SPACE INSTALLATIONS
FURNACE MAXIMUM
BTUH INPUT RATING
WITH 8 FT. CEILING
MINIMUM AREA IN SQUARE FEET OF
UNCONFINED SPACE
40,000
60,000
80,000
97,000
110,000
250
375
500
625
688
CONFINED
SPACE
7
1. All air from inside the building as in Figure 8: The
conned space shall be provided with two permanent
openings communicating directly with an additional
room(s) of sufcient volume so that the combined
volume of all spaces meets the criteria for an unconned
space. The total input of all gas utilization equipment
installed in the combined space shall be considered in
making this determination. Refer to Table 2 for minimum
open areas requirements.
2. All air from outdoors as in Figure 9: The conned
space shall be provided with two permanent openings,
one commencing within 12 inches of the top and one
commencing within 12 inches of the bottom of the
enclosure. The openings shall communicate directly, or
by ducts, with the outdoors or spaces (crawl or attic) that
freely communicate with the outdoors. Refer to Table 2,
for minimum open areas requirements.
TABLE 3
MINIMUM FREE AREA IN SQUARE INCHES
EACH OPENING (FURNACE ONLY)
FURNACE
MAXIMUM
BTUH/INPUT
RATING
AIR
FROM
INSIDE
AIR FROM OUTSIDE
VERTICAL
DUCT
HORIZONTAL
DUCT
40,000
60,000
80,000
97,000
110,000
100
100
100
100
110
10
15
20
25
28
20
30
40
50
55
8
9

10 18-CD35D1-4
INSTALLER’S GUIDE
DUCT CONNECTIONS
Air duct systems should be installed in accordance with standards
for air conditioning systems, National Fire Protection Association
Pamphlet No. 90. They should be sized in accordance with ACCA
Manual D or whichever is applicable.
Central furnaces, when used in connection with cooling units, shall
be installed in parallel or on the upstream side of the cooling coil
to avoid condensation in the heat exchanger. With a parallel ow
arrangement, the dampers or other means used to control ow of air
shall be adequate to prevent chilled air from entering the furnace,
and if manually operated, must be equipped with means to prevent
operation of either unit unless the damper is in full heat or cool
position.
On any job, exible connections of nonammable material may be
used for return air and discharge connections to prevent transmission
of vibration. Though these units have been specically designed for
quiet, vibration free operation, air ducts can act as sounding boards
and could, if poorly installed, amplify the slightest vibration to the
annoyance level.
When the furnace is located in a utility room adjacent to the
living area, the system should be carefully designed with returns
to minimize noise transmission through the return air grille.
Although these furnaces are designed with large blowers operating
at moderate speeds, any blower moving a high volume of air will
produce audible noise which could be objectionable when the unit
is located very close to a living area. It is often advisable to route
the return air ducts under the oor or through the attic. Such design
permits the installation of air return remote from the living area
(i.e. central hall).
When the furnace is installed so that the supply ducts carry air
circulated by the furnace to areas outside the space containing the
furnace, the return air shall also be handled by a duct(s) sealed to the
furnace and terminating outside the space containing the furnace.
RETURN AIR DUCT CONNECTION
NOTE:
On upflow 5 ton airflow models where the
airflow requirement exceeds 1800 CFM - Models
will require return air openings and filters on: (1)
both sides; or (2) one side and the bottom; or (3)
just the bottom.
All return air duct systems should provide for installation of
return air lters.
1. Determine the appropriate position to set the furnace in
order to connect to the existing supply and return ductwork.
NOTE:
Minimum return air temperature is 55° F.
2. Refer to Figure 11 and the M95 Outline Drawing for duct
connection dimensions for various furnaces.
3. The side panels on upow furnaces include locating notches
which may be used as guides for cutting an opening for
return air. Refer to Figure 11 and the Outline Drawings for
duct connection dimensions for specic furnace models.
4. If a 3/4" ange is to be used for attaching the air inlet duct,
add to cut where indicated by dashed lines in Figure 11.
Cut corners diagonally and bend outward to form ange.
5. If anges are not required and a lter frame is installed, cut
along knockout guides.
6. Upow Furnaces: Use the optional lter rack on either
side or on the bottom if the lter is to be used within the
furnace cabinet.
7. When the upow furnace is installed in the horizontal
application and a return duct is attached to the top side as
shown in Figure 10, install the lter in a remote location.
Do not install the lter in the return duct directly above the
furnace in horizontal applications.
▲
WARNING
!
Do NOT install the filter in the return duct directly
above the furnace in horizontal applications.Install
the filter remotely. Installing the filter directly
above the furnace in horizontal applications may
cause property damage, serious injury or death.
▲WARNING
!
SAFETY HAZARD
To prevent injury or death due to contact with
moving parts, turn the power to the furnace off
before servicing filters
Failure to follow the safety warnings exactly could
result in serious injury, death or property damage.
When the upow furnace is installed in the horizontal
application and a close coupled (less than 36") return duct
is attached to the bottom side of the furnace as shown in
Figure 10, securely attach a 1/2" mesh metal hardware cloth
protective screen to the inside bottom of the lter grill to
prevent personal injury from contacting moving parts when
reaching into the return opening to replace the lter.
Close coupled (less than 36") return (lter directly beneath
bottom side return) is not recommended due to noise
considerations.
Downow Furnaces: Brackets must be eld supplied (Figure
12). Order BAYBRCKFLT10 2-FLR01185 for 14.5" models,
2 -FLR01186 for 17.5", 21.5" and 24.5" models.
8. Connect the duct work to the furnace. See the M95
Outline Drawing for supply and return duct size and
location. Flexible duct connectors are recommended to
connect both supply and return air ducts to the furnace.
If only the front of the furnace is accessible, it is
recommended that both supply and return air plenums are
removable.
9. When replacing a furnace, old duct work should be cleaned
out. Thin cloths should be placed over the registers and the
furnace fan should be run for 10 minutes. Don’t forget to
remove the cloths before you start the furnace.

18-CD35D1-4 11
INSTALLER’S GUIDE
FILTER
REMOVE FILTER FROM UPFLOW
FURNACE WHEN RETURN DUCT IS
ATTACHED TO FURNACE TOP SIDE
(HORIZONTAL APPLICATIONS) AS
SHOWN.
Close coupled (less than 36")
return (filter directly beneath bottom
side return) not recommended due to
noise considerations. If used, securely
attach 1/2" mesh metal hardware cloth
protective screen to the inside bottom of
filter grill.
0
*SEE OUTLINE DRAWING
q
LOCATING
NOTCHES
PROVIDED
FOR SIDE
RETURN
CUTOUT
*
*
*
*
CUT OUT
FOR SIDE
FILTER
FRONT of
Furnace
TABLE 4
MINIMUM CLEARANCE FROM COMBUSTIBLE MATERIALS
FOR UPFLOW/HORIZONTAL LEFT AND DOWNFLOW/
HORIZONTAL RIGHT FURNACES
UNIT
LOCATION
FURNACE
SURFACE
VERTICAL
CLOSET
HORIZONTAL
CLOSET
HORIZONTAL
ALCOVE /
ATTIC
SIDES 0" 1" 0"
BACK 0" 3" 6"
TOP 1" 1" 1"
FRONT 3" 3" 18"
VENT 0" 0" 0"
NOTE: CLEARANCE REQUIRED AT TOP OF PLENUM IS 1"
RETURN AIR FILTERS
(Filter and lter rack are not supplied with unit)
TYPICAL UPFLOW RETURN AIR FILTER INSTALLATIONS
These furnaces require high velocity type air filters. The
optional filters may be located within the furnace blower
compartment for UPFLOW furnaces in either a BOTTOM
or SIDE (left side or right side) return air inlet. Some
optional filters may need to be trimmed for side or bottom
filter use. See Figure 13.
Airflow
w
TYPICAL DOWNFLOW FURNACE
RETURN AIR FILTER INSTALLATIONS
Two high velocity type air lters are required for each downow
furnace. Downow furnaces in the horizontal conguration must
have the lters outside of the cabinet.
Typical installations are shown in Figure 12 and 14. Table 5 and 6
provide information for installation of the lter retaining brackets
shipped with downow furnaces.
Airflow
r
e
Typical Filters of Upflow in Horizontal
Typical Filters of Downflow Horizontal
Typical Filters in Downflow
Airflow
BAYBRCKFLT10
Accessory filter kit BAYFLTR203,
204, or 205 used for Upflow
Horizontal furnaces

12 18-CD35D1-4
INSTALLER’S GUIDE
TABLE 5
CABINET
WIDTH
FILTER
SIZE
FILTER BRACKET
LOCATION *
14-1/2" 2 - 14X20X1 12-7/8"
17-1/2" 2 - 16X20X1 14-3/8"
21" 2 - 16X20X1 13-1/8"
24-1/2" 2 - 16X20X1 11-5/8"
* Location dimension is from end of duct to the screw holes for the
bracket.
TABLE 6
CABINET
WIDTH
RETURN
DUCT
WIDTH
FILTER ACCESS
OPENING -
DIMENSION "A"
FILTER ACCESS
OPENING -
DIMENSION "B"
14-1/2" 13-1/4" 12" 14"
17-1/2" 16-1/4" 15" 14"
21" 19-3/4" 19-1/2" 14"
24-1/2" 23-1/4" 22" 14"
GENERAL VENTING
IMPORTANT:
These furnaces may be installed as Direct Vent
(sealed combustion) or as Non-direct vent
(single pipe). The furnaces are shipped DIRECT
VENT with sealed combustion. Please refer to
Table 11 and 12 for maximum vent length.
For DIRECT VENT APPLICATION: The furnaces
must be vented to the exterior of the house and
combustion air MUST come through the inlet air
pipe FROM OUTSIDE AIR.
For NON-DIRECT VENT APPLICATION: The
furnace shall be vented to the exterior of the
house, but combustion air may enter from
the surrounding area as long as combustion
air requirements are met. (See AIR FOR
COMBUSTION AND VENTILATION)
THIS FURNACE MUST BE VENTED TO THE OUTDOORS.
THESE FURNACES ARE INDUCED DRAFT VENTED AND
MUST NOT BE CONNECTED TO ANY VENT SERVING
ANOTHER APPLIANCE. PLEASE NOTE THAT THESE
FURNACES USE POSITIVE-PRESSURE VENT SYSTEMS.
Proper venting is essential to obtain maximum efciency from
a condensing furnace. Proper installation of the vent system
is necessary to assure drainage of the condensate and prevent
deterioration of the vent system.
American Gas Association has certied the design of condensing
furnaces for a minimum of 0" clearance from combustible
materials with a single wall plastic vent pipe.
The recommended system is assembled from 2", 2-1/2", or
3" plastic pipe and ttings (See Table 10). Where the system
is routed to the outdoors through an existing masonry chimney
containing ue products from another gas appliance, or where
required by local codes, then 3" venting of Type 29-4C stainless
steel must be used in place of PVC material.
These furnaces have been classied as CATEGORY IV furnaces
in accordance with the latest edition of ANSI Z21.47 • CAN/
CGA-2.3 Standards. Category IV furnaces operate with positive
vent pressure and with a vent gas temperature less than 140°F
above the dew point. These conditions require special venting
systems, which must be gas tight and water tight.
NOTE:
When an existing furnace is removed from a
venting system serving other gas appliances,
the venting system is likely to be too large to
properly vent the remaining attached appliances.
The following steps shall be followed with each appliance
remaining connected to the common venting system placed in
operation, while the other appliances remaining connected to the
common venting system are not in operation.
1. Seal any unused openings in the common venting system.
2. Visually inspect the venting system for proper size and
horizontal pitch and determine there is no blockage or
restriction, leakage, corrosion or other deciencies which
could cause an unsafe condition.
3. Insofar as is practical, close all building doors and
windows and all doors between the space in which the
appliances remaining connected to the common venting
system are located and other spaces of the building. Turn
on clothes dryers and any appliances not connected to
the common venting system. Turn on any exhaust fans,
such as range hoods and bathroom exhausts, so they will
operate at maximum speed. Do not operate a summer
exhaust fan, close replace dampers.
4. Follow the lighting instructions. Place the appliance
being inspected in operation. Adjust thermostat so
appliance will operate continuously.
5. Test for spillage at the draft hood relief opening after
5 minutes of main burner operation. Use the ame of a
match or candle.
6. After it has been determined that each appliance
remaining connected to the common venting system
properly vents when tested as outlined above, return
door, windows, exhaust fans, replace dampers and any
other gas-burning appliance to their previous conditions
of use.
If improper venting is observed during any of the above tests,
the remaining common venting system must be corrected.
Correction of the remaining common vent system should be
done by referring to the latest edition of the National Fuel Gas
Code (ANSI Z223.1) • CAN/CGA B149.1 Installation Codes

18-CD35D1-4 13
INSTALLER’S GUIDE
or “Exhibit J” of ANSI Z21.47 • CAN/ CGA-2.3 Standards.
The following are general steps to be used to correct or resize
a remaining vent system when a furnace which may not be
common vented is removed from the system:
a. Determine the BTU per hour input of all remaining
appliances attached to the venting system.
b. Determine the diameter, rise, and lateral of the existing
venting system, as well as quantity and type of bends.
c. Use the appropriate tables in the latest edition of
the National Fuel Gas Code (ANSI Z223.1 • CAN/
CGA B149.1 Installation Codes or “Exhibit J” of
ANSI Z21.47 • CAN/ CGA-2.3 Standards. “Exhibit
J” includes examples and drawings of typical venting
systems.
VENTING MATERIAL
PVC VENT FITTING MATERIAL
These ttings are available from your Gas Furnace Distributors.
Straight Pipe Sections, Couplings, 45° Elbows, 60° Elbows, 90°
Elbows, Vent or Sanitary Tee, or other necessary ttings may be
2", 2½", 3", or 4" diameter. The allowable materials are shown
in Table 7.
VENT FITTING MATERIAL – PLASTIC
Gas and liquid tight single wall vent ttings, designed for
resistance to corrosive ue condensate, MUST be used
throughout.
Listed in Table 7 are 2", 2½", 3", and 4" size ttings that meet
these requirements. The materials listed are various grades of
PVC and ABS plastic.
PIPE JOINTS: All joints must be fastened and sealed to prevent
escape of combustion products into the building.
NOTE: It is recommended that the first joints
from the furnace be connected and sealed with
high temperature RTV. This will enable the pipes
to be removed later without cutting.
Be sure to properly support these joints.
BONDING OF PVC
Commercially available solvent cement must be used to join the
pipe and ttings. Follow instructions on the container carefully.
Procedure for Cementing Joints:
1. Cut pipe square, remove ragged edges and burrs. Chamfer
end of pipe, then clean tting socket and pipe joint area
of all dirt, grease, moisture or chips.
2. After checking pipe and socket for proper t, wipe socket
and pipe with cleaner-primer. Apply a liberal coat of
primer to inside surface of socket and outside of pipe.
DO NOT ALLOW PRIMER TO DRY BEFORE APPLYING
CEMENT.
3. Apply a thin coat of cement evenly in the socket. Quickly
apply a heavy coat of cement to the pipe end and insert
pipe into tting with a slight twisting movement until it
bottoms out.
4. Hold the pipe in the tting for 30 seconds to prevent
tapered socket from pushing the pipe out of the tting.
5. Wipe all excess cement from the joint with a rag. Allow
15 minutes before handling. Cure time varies according
to t, temperature and humidity.
NOTE:
Follow venting instructions carefully when
using PVC cement.
IMPORTANT:
All joints must be water tight. Flue condensate
is somewhat acidic, and leaks can cause
equipment damage.
Connection of the pipe and collar of the combustion air inlet
should just be a friction t. It is recommended that the inlet air
joint be sealed with RTV type sealant to allow the joint to be
separated for possible future service. The inlet and vent pipes
must be properly supported throughout the entire length.
▲
WARNING
!
CARBON MONOXIDE POISONING HAZARD
Do not replace any of the factory supplied venting
components with field fabricated parts. Failure to
follow this safety warning exactly could result in
damaged vents, damaged components, carbon
monoxide poisoning, or death.
Connection of the vent pipe to the vent collar should also be
accomplished using RTV type sealant. This type sealant provides
a connection which remains exible and can be separated in the
future if service needs require the removal of the vent pipe for
service or clearance. See Figure 15.
Seal VENT PIPE
with RTV sealant
Seal INLET AIR PIPE
with RTV sealant
Front of Furnace
VENT AND INLET AIR CONNECTIONS
t

14 18-CD35D1-4
INSTALLER’S GUIDE
TABLE 7
PLASTIC PIPE DESIGNATIONS
PVC
ASTM STANDARD PIPE TYPE ALLOWABLE TEMPERATURE MARKING
F891 CELLULAR CORE *158 ASTM F891
D2665 DWV PIPE **158 ASTM D2665
D1785 SCH 40, 80, 120 **158 ASTM D1785
D2241 SDR SERIES **158 ASTM D2241
CPVC
ASTM STANDARD PIPE TYPE ALLOWABLE TEMPERATURE MARKING
D2846 CPVC 41 **212 ASTM D2846
F441 SCH 40, 80 **212 ASTM F441
F442 SDR SERIES **212 ASTM F442
ABS
ASTM STANDARD PIPE TYPE ALLOWABLE TEMPERATURE MARKING
D2661 SCH 40 DWV ***180 ASTM D2661
F628 SCH 40 DWV CELLULAR CORE ***180 ASTM F628
*Allowable temperatures based on classifications covered in ASTM D4396 [Deflection Temps Under Load (264 PSI)]
**Allowable temperatures based on classifications covered in ASTM D1784 [Deflection Temps Under Load (264 PSI)]
***Allowable temperatures based on classifications covered in ASTM D3965 [Deflection Temps Under Load (264 PSI)]
UPFLOW/ HORIZONTAL VENTING TABLE
MAXIMUM VENT LENGTH:
MODEL
DIRECT VENT (2 PIPE SYSTEM) -
MAXIMUM TOTAL EQUIVALENT FEET FOR
VENT AND INLET AIR PIPES (SEE NOTES)
NON-DIRECT VENT (1 PIPE SYSTEM) -
MAXIMUM TOTAL EQUIVALENT FEET FOR
VENT PIPES ONLY (SEE NOTES)
2" PIPE &
FITTINGS
2-1/2" PIPE
& FITTINGS
3" PIPE &
FITTINGS
4" PIPE &
FITTINGS
2" PIPE &
FITTINGS
2-1/2" PIPE
& FITTINGS
3" PIPE &
FITTINGS
4" PIPE &
FITTINGS
M951P040BU24AA 60 80 100 130 50 80 80 130
M951P060BU36AA 60 80 100 130 50 80 80 130
M951P080BU42AB 40 80 100 130 30 80 80 130
M951P100CU48AA NA NA 90 130 NA NA 70 130
M951P100DU60AA NA NA 90 130 NA NA 70 130
M951P120DU60AA NA NA 50 130 NA NA 30 130
NOTES: *First letter may be "A" or "T", NA = NOT ALLOWED
1. The INLET AIR of one pipe systems require the installation of a 90° elbow (to prevent dust and debris from falling straight into the furnace)
and a 2 foot horizontal or vertical straight pipe section connected before or after the elbow.
2. DO NOT MIX PIPE DIAMETERS IN THE SAME LENGTH OF PIPE OUTSIDE THE FURNACE CABINET (Except adapters at the top of the
furnace). If different inlet and vent pipe sizes are used, the vent pipe must adhere to the maximum length limit shown in the table above (See
Note 7 below for exception). The inlet pipe can be of a larger diameter, but never smaller than the vent pipe.
3. MAXIMUM PIPE LENGTHS MUST NOT BE EXCEEDED! THE LENGTH SHOWN IS NOT A COMBINED TOTAL, IT IS THE MAXIMUM
LENGTH OF EACH (Vent or Inlet air pipes in two pipe systems).
4. One standard radius 90° elbow is equivalent to 12' of 4" pipe; one SHORT radius 90° elbow is equivalent to 10' of 3" pipe and one LONG
radius elbow is equivalent to 6' of 3" pipe. One SHORT/LONG radius 90° elbow is equivalent to 7½' of 2½" pipe, and 5' of 2" pipe. Two 45°
elbows equal one 90°elbow.
5. The termination tee or bend must be included in the total number of elbows. If the BAYAIR30AVENTA termination kit is used, the equivalent
length of pipe is 5 feet. There is zero equivalent length for the BAYVENT200.
6. Pipe adapters are field supplied.
7. 4" pipe may be reduced to 3" for termination with BAYAIR30AVENTA or BAYVENT200 without additional length restriction.
8. For Canadian applications Only: IPEX 196006 may be used for horizontal and vertical terminations. IPEX 081216, IPEX 081218, and IPEX
081219 may only be used for horizontal vent terminations. Equivalent lengths are IPEX 196009 = 5 feet, IPEX 081216 = 11 feet, IPEX 081218
= 16 feet, and IPEX 081219 = 21 feet.
TABLE 8
VENTING TABLES

18-CD35D1-4 15
INSTALLER’S GUIDE
DOWNFLOW/ HORIZONTAL VENTING TABLE
MAXIMUM VENT LENGTH:
MODEL
DIRECT VENT (2 PIPE SYSTEM) - MAXIMUM TOTAL
EQUIVALENT FEET FOR VENT AND INLET AIR PIPES
(SEE NOTES)
NON-DIRECT VENT (1 PIPE SYSTEM) - MAXIMUM
TOTAL EQUIVALENT FEET FOR VENT PIPES ONLY
(SEE NOTES)
2" PIPE &
FITTINGS
2-1/2" PIPE
& FITTINGS
3" PIPE &
FITTINGS
4" PIPE &
FITTINGS
2" PIPE &
FITTINGS
2-1/2" PIPE
& FITTINGS
3" PIPE &
FITTINGS
4" PIPE &
FITTINGS
M951P040BD24AA 60 80 100 130 50 80 80 130
M951P065BD42AA 45 80 100 130 40 80 80 130
M951P085CD48AA NA 80 100 130 NA 80 80 130
M951P110DD60AA NA 15 60 130 NA NA 50 130
NOTES: * - First letter may be "A" or "T", NA = NOT ALLOWABLE
1. The INLET AIR of one pipe systems require the installation of a 90° elbow (to prevent dust and debris from falling straight into the furnace)
and a 2 foot horizontal or vertical straight pipe section connected before or after the elbow.
2. DO NOT MIX PIPE DIAMETERS IN THE SAME LENGTH OF PIPE OUTSIDE THE FURNACE CABINET (Except adapters at the top of the
furnace). If different inlet and vent pipe sizes are used, the vent pipe must adhere to the maximum length limit shown in the table above (See
Note 7 below for exception). The inlet pipe can be of a larger diameter, but never smaller than the vent pipe.
3. MAXIMUM PIPE LENGTHS MUST NOT BE EXCEEDED! THE LENGTH SHOWN IS NOT A COMBINED TOTAL, IT IS THE MAXIMUM
LENGTH OF EACH (Vent or Inlet air pipes in two pipe systems).
4. One standard radius 90° elbow is equivalent to 12' of 4" pipe; one SHORT radius 90° elbow is equivalent to 10' of 3" pipe and one LONG
radius elbow is equivalent to 6' of 3" pipe. One SHORT/LONG radius 90° elbow is equivalent to 7½' of 2½" pipe, and 5' of 2" pipe. Two 45°
elbows equal one 90°elbow.
5. The termination tee or bend must be included in the total number of elbows. If the BAYAIR30AVENTA termination kit is used, the equivalent
length of pipe is 5 feet. There is zero equivalent length for the BAYVENT200B.
6. Pipe adapters are field supplied.
7. 4" pipe may be reduced to 3" for termination with BAYAIR30AVENTA or BAYVENT200B without additional length restriction.
8. For Canadian applications Only: IPEX 196006 may be used for horizontal and vertical terminations. IPEX 081216, IPEX 081218, and IPEX
081219 may only be used for horizontal vent terminations. Equivalent lengths are IPEX 196009 = 5 feet, IPEX 081216 = 11 feet, IPEX 081218
= 16 feet, and IPEX 081219 = 21 feet.
TABLE 9
Vent only
to outside
Air Inlet
B
A
A (0-2') or greater
B (0-2') or greater
A+B = 2' minimum
UPFLOW FURNACE
y
Vent only
to outside
Air Inlet
A
A = 2' minimum
DOWNFLOW
FURNACE
SINGLE PIPE VENTING
NOTE:
To ensure proper operation at the vent lengths
indicated, the combustion air inlet and vent
terminals should be in the same pressure
zone. Terminating the vent and inlet in different
pressure zones will change the maximum vent
lengths and may cause nuisance tripping of the
pressure switch(es). The amount of change can
not be predicted. The selection of the inlet and
outlet terminal locations are the responsibility
of the designer/installer. If the installer chooses
separate pressure zones for the terminals, the
combustion air inlet termination must be in the
higher (more positive) pressure zone.
IMPORTANT:
Products installed in Canada must use vent
systems that are certified to the Standard forType
BH GasVenting Systems (ULC S636) for Class II-A
venting systems (up to 65°C). Components of the
vent system must not be interchanged with other
vent systems or unlisted pipe or fittings. Plastic
components, specified primers, and glues must
be from a single system manufacturer and not
intermixed with other system manufacturer's
vent system parts. In addition, the first three feet
of the vent pipe must be visible for inspection.

16 18-CD35D1-4
INSTALLER’S GUIDE
Table 10 - See Figure 17-Direct Vent Terminal
Clearances Canadian Installations US Installations
A= Clearance above grade, veranda, porch,
deck, or balcony 12 inches (30 cm) 12 inches (30 cm)
B= Clearance to window or door that may be
opened
6 inches (15 cm) for appliances =/<
10,000 Btuh (3 kw), 12 inches (30 cm) for
appliances > 10,000 Btuh (3 kw) and =/<
100,000 Btuh (30 kw), 36 inches (91 cm) for
appliances > 100,000 Btuh (30 kw)
6 inches (15 cm) for appliances =/< 10,000
Btuh (3 kw), 9 inches (23 cm) for appliances
> 10,000 Btuh (3 kw) and =/< 50,000 Btuh
(15 kw), 12 inches (30 cm) for appliances >
50,000 Btuh (15 kw)
C= Clearance to permanently closed window * *
D=
Vertical clearance to ventilated soffit located
above the terminal within a horizontal
distance of 2 feet (61 cm) from the center
line of the terminal
**
E= Clearance to unventilated soffit * *
F= Clearance to outside corner * *
G= Clearance to inside corner * *
H= Clearance to each side of center line
extended above meter/regulator assembly
3 feet (91 cm) with a height 15 feet (4.5 m)
above the meter/regulator assembly *
I= Clearance to service regulator vent outlet 3 feet (91 cm) *
J=
Clearance to nonmechanical air supply inlet
to building or the combustion air inlet to any
other appliance
6 inches (15 cm) for appliances =/<
10,000 Btuh (3 kw), 12 inches (30 cm) for
appliances > 10,000 Btuh (3 kw) and =/<
100,000 Btuh (30 kw), 36 inches (91 cm) for
appliances > 100,000 Btuh (30 kw)
6 inches (15 cm) for appliances =/< 10,000
Btuh (3 kw), 9 inches (23 cm) for appliances
> 10,000 Btuh (3 kw) and =/< 50,000 Btuh
(15 kw), 12 inches (30 cm) for appliances >
50,000 Btuh (15 kw)
K= Clearance to a mechanical air supply inlet 6 feet (1.83m) 3 feet (91 cm) above if within 10 feet (3m)
horizontally
L= Clearance above a paved sidewalk or paved
driveway located on public property 7 feet (2.13 m) † *
M= Clearance under veranda, porch, deck, or
balcony `12 inches (30 cm) ‡ *
Notes:
1. In accordance with the current CSA B149.1 Natural Gas and Propane Installation Code.
2. In accordance with the current ANSI Z223.1/NFPA 54 National Fuel Gas Code.
†. A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwelling and serves both
dwellings.
‡. Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
* Clearance in accordance with local installation codes and the requirements of the gas supplier and the manufacturer's Installation Instructions.
HORIZONTAL VENTING
NOTE:
Vent termination kit BAYAIR30AVENTA or
BAYVENT200B may be used instead of the
horizontal and vertical termination options shown
in the following figures. For Canadian applications
Only: IPEX 196006 may be used for horizontal and
vertical terminations. IPEX 081216, IPEX 081218,
and IPEX 081219 may only be used for horizontal
vent terminations.
▲
CAUTION
!
When the vent pipe is exposed to temperatures
below freezing, i.e., when it passes through
unheated spaces, etc., the pipe must be insulated
with 1/2 inch (22.7 mm) thick Armaflex-type
insulation or equal. If the space is heated
sufficiently to prevent freezing, then the insulation
would not be required. If domestic water pipes are
not protected from freezing then it is assumed the
space meets the condition of a heated space.
HORIZONTAL VENTING THROUGH WALL
These furnaces may be installed as direct vent (as shipped) or as
non-direct vent. Installation must conform to national, state, and
local codes.
The vent and inlet terminals must be located at least 12" minimum
(18" in Canada) above normally expected snow accumulation
level.
Avoid areas where staining or condensate drippage may be a
problem.
Location of the vent/ wind terminal should be chosen to meet
the requirements of Figure 26 for either direct or non-direct vent
applications.
PITCH – Venting through the wall must maintain 1/4" per foot
pitched upward to insure that condensate drains back to the
furnace.

18-CD35D1-4 17
INSTALLER’S GUIDE
Table 11 - See Figure 17 Non-Direct Vent
Terminal Clearances Canadian Installations US Installations
A= Clearance above grade, veranda, porch,
deck, or balcony 12 inches (30 cm) 12 inches (30 cm)
B= Clearance to window or door that may be
opened
6 inches (15 cm) for appliances =/<
10,000 Btuh (3 kw), 12 inches (30 cm) for
appliances > 10,000 Btuh (3 kw) and =/<
100,000 Btuh (30 kw), 36 inches (91 cm) for
appliances > 100,000 Btuh (30 kw)
4 feet (1.2m) below or to the side of
opening; 1 foot (0.3m) above opening.
C= Clearance to permanently closed window * *
D=
Vertical clearance to ventilated soffit located
above the terminal within a horizontal
distance of 2 feet (61 cm) from the center
line of the terminal
* *
E= Clearance to unventilated soffit * *
F= Clearance to outside corner * *
G= Clearance to inside corner * *
H= Clearance to each side of center line
extended above meter/regulator assembly
3 feet (91 cm) with a height 15 feet (4.5 m)
above the meter/regulator assembly *
I= Clearance to service regulator vent outlet 3 feet (91 cm) *
J=
Clearance to non-mechanical air supply
inlet to building or the combustion air inlet to
any other appliance
6 inches (15 cm) for appliances =/<
10,000 Btuh (3 kw), 12 inches (30 cm) for
appliances > 10,000 Btuh (3 kw) and =/<
100,000 Btuh (30 kw), 36 inches (91 cm) for
appliances > 100,000 Btuh (30 kw)
4 feet (1.2 m) below or to side of opening; 1
foot (300 m) above opening
K= Clearance to a mechanical air supply inlet 6 feet (1.83m) 3 feet (91 cm) above if within 10 feet (3m)
horizontally
L= Clearance above a paved sidewalk or
paved driveway located on public property 7 feet (2.13 m) † 7 feet (2.13 m)
M= Clearance under veranda, porch, deck, or
balcony `12 inches (30 cm) ‡ *
Notes:
1. In accordance with the current CSA B149.1 Natural Gas and Propane Installation Code.
2. In accordance with the current ANSI Z223.1/NFPA 54 National Fuel Gas Code.
†. A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwelling and serves both
dwellings.
‡. Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
* Clearance in accordance with local installation codes and the requirements of the gas supplier and the manufacturer's Installation Instructions.
V
D
EE
V
G
INSIDE
CORNER DETAIL
B
L
V
V
FIXED
CLOSED
OPERABLE
F
B
C
V
FIXED
CLOSED
V
V
V
B
B
B
A
X
J
B
H
I
V
X
K
M
V
VENT TERMINAL XAIR SUPPLY INLET AREA WHERE TERMINAL IS NOT PERMITTED
OPERABLE
u
VENT CLEARANCES
See Table 10 and 11

18 18-CD35D1-4
INSTALLER’S GUIDE
POSSIBLE CONFIGURATIONS FOR TWO PIPE VENTING SYSTEMS
ELBOW AND TEE MUST BE
AS CLOSE TOGETHER AS
POSSIBLE
i
FLUE GAS DEGRADATION – The moisture content of the
ue gas may have a detrimental effect on some building materials.
This can be avoided by using the roof or chimney venting option.
When wall venting is used on any surface that can be affected by
this moisture, it is recommended that a corrosion resistant shield
(24 inches square) be used behind the vent terminal. This shield
can be wood, plastic, sheet metal, etc. Also, silicone caulk all
cracks, seams and joints within 3 feet of the vent terminal.
COMBUSTIBLE MATERIAL WALL
A minimum clearance of 1" to combustible materials must be
maintained when using single wall stainless steel venting. See
Figure 30.
Shield material to be a minimum of 24 gauge stainless or
aluminized sheet metal. Minimum dimensions are 12"x12".
Shield must be fastened to both inside and outside of wall. Use
screws or anchor type fasteners suited to the outside or inside
wall surfaces.
NONCOMBUSTIBLE MATERIAL WALL
The hole through the wall must be large enough to maintain pitch
of vent and properly seal.
Use cement mortar seal on inside and outside of wall.
See Figure 22.
VENTING THROUGH ROOF
When penetrating roof with a 2" PVC vent pipe, a 2" electrical
conduit ashing may be used for a weather tight seal. Lubricate
exible seal on ashing before PVC pipe is pushed through the
seal. (Field Supplied)
NOTE:
No vent cap as shown in Figure 26 is the
preferred method for vertical vent termination
in extremely cold climates. In extreme climate
conditions, insulate the exposed pipe above the
roof line with Armaflex type insulation.

18-CD35D1-4 19
INSTALLER’S GUIDE
COMBUSTION
AIR VENT
12" MIN TO
OVERHANG
1"
MAINTAIN 12 IN
MINIMUM CLEARANCE
ABOVE HIGHEST
ANTICIPATED SNOW
LEVEL OR GRADE
WHICHEVER IS GREATER
12"
BAYAIR30AVENTA
(Sidewall)
pdSUPPORT HORIZONTAL PIPE EVERY
3' 0" WITH THE FIRST SUPPORT AS
CLOSE TO THE FURNACE AS POSSIBLE.
INDUCED DRAFT BLOWER, HOUSING,
AND FURNACE MUST NOT SUPPORT
THE WEIGHT OF THE FLUE PIPE.
COUPLING
(PLASTIC
VENTING) STUD
PVC WALL
MOUNT FLANGE
(OPTIONAL)
APPROVED
TERMINATION
1” CLEARANCE
(AIR SPACE)
VENTING THROUGH COMBUSTIBLE WALLS
Pitch - 1/4 Inch Per Foot
CLEARANCE (0” ACCEPTABLE FOR PVC VENT PIPE)
(1” ACCEPTABLE FOR TYPE 29-4C STAINLESS STEEL VENT PIPE)
12” MINIMUM ABOVE
NORMALLY EXPECTED
SNOW ACCUMULATION
LEVEL
6 IN. MIN.
(TO JOINT)
COUPLING
(PLASTIC
VENTING)
PVC WALL
MOUNT FLANGE
(OPTIONAL)
APPROVED
TERMINATION
CEMENT
MORTAR SEAL
INSIDE &
OUTSIDE
VENTING THROUGH NON-COMBUSTIBLE WALLS
Pitch - 1/4 Inch Per Foot
12” MINIMUM ABOVE
NORMALLY EXPECTED
SNOW ACCUMULATION
LEVEL
6 IN. MIN.
(TO JOINT)
a
s
For Canadian Applications Only: IPEX 196006, IPEX 081216,
IPEX 081218, and IPEX 081219 may be used for horizontal vent
terminations. Maintain 18 in. minimum clearance above highest
anticipated snow level or grade whichever is greater.
VENT
COMBUSTION
AIR
VENT
VENT
PLATE
VENT
CAP
12" MINIMUM
TO OVERHANG
MAINTAIN 12" MINIMUM
CLEARANCE ABOVE HIGHEST ANTICIPATED
SNOW LEVEL OR GRADE WHICHEVER IS GREATER
SCREWS
(4 req.)
ANCHORS
(4 req.)
7.2"
3.2"
BAYVENT200B
o
For Canadian Applications Only: IPEX 196006, IPEX 081216,
IPEX 081218, and IPEX 081219 may be used for horizontal vent
terminations. Maintain 18 in. minimum clearance above highest
anticipated snow level or grade whichever is greater.

20 18-CD35D1-4
INSTALLER’S GUIDE
NOTE: VENT AND INLET MUST BE
SUPPORTED AT A MAXIMUM OF 3' INTERVALS
40" UPFLOW OR
DOWNFLOW MODELS
SEE VENTING TABLE
OUTSIDE
WALL
NOTE: ANY FITTINGS PASSING
THROUGH AN UNHEATED SPACE
MUST BE INSULATED.
FIRST SUPPORT SHOULD BE AS
CLOSE TO FURNACE CONNECTION
AS POSSIBLE.
UPWARD PITCH -- 1/4" PER FOOT
STRAPS OR OTHER SUITABLE SUPPORTS
AT MAXIMUM OF 3'-0" INTERVALS
COMBUSTION
AIR INLET
USE ONLY
APPROVED
TERMINATION
TEE
RAIN CAP
COMBUSTION AIR
STRAP
(FIELD SUPPLIED)
COMBUSTION
AIR
VENT
ELBOW
(FIELD
SUPPLIED)
VENT
1" + 1/2"
BAYAIR30AVENTA
3" PIPING
2", 2-1/2"
or 3" PIPING
REDUCING
COUPLING,
FIELD SUPPLIED
IF NEEDED
SEAL ALL
WALL CAVITIES
BAYVENT200B
f
For Canadian applications only, IPEX 196006, IPEX 081216, IPEX 081218,
and IPEX 081219 may be used for horizontal vent terminations.
▲CAUTION
!
The vent for this appliance shall not terminate
1. Over public walkways; or
2. Near sofit vents or crawl space vents or other areas
where condensate or vapor could create a nuisance or
hazard or cause property damage; or
3. Where condensate vapor could cause damage or
could be detrimental to the operation of regulators,
relief valves. or other equipment.