UTICA BOILERS DV-B Series Installation and operating instructions

VENTING ADDENDUMVENTING ADDENDUM VENTING ADDENDUMVENTING ADDENDUM
VENTING ADDENDUM
DD
DD
DVV
VV
V-B-B
-B-B
-B
GAS FIRED BOILERS
FOR FORCED HOT WATER
Utica Boilers •P.O. Box 4729 • Utica, NY 13504

TT
TT
TABLE OF CONTENTSABLE OF CONTENTS
ABLE OF CONTENTSABLE OF CONTENTS
ABLE OF CONTENTS
HORIZONTAL PIPING .................................................................................. PAGES 1-10
WARNINGS............................................................................................... PAGE 1
INSTALLATION .................................................................................... PAGES 2-3
TYPICAL INSTALLATION ......................................................................... PAGE 4
FLEX-L PIPING COMPONENTS ............................................................... PAGE 5
HEAT FAB PIPING COMPONENTS ........................................................... PAGE 6
Z-FLEX PIPING COMPONENTS ............................................................... PAGE 7
PROTECH PIPING COMPONENTS........................................................... PAGE 8
CONDENSATE DRAINS............................................................................ PAGE 9
LOCATING THE VENT TERMINATION ................................................PAGES 9-10
VERTICAL VENT PIPING ........................................................................... PAGES 11-18
INSTALLATION .................................................................................. PAGE 11-16
B VENT SINGLE APPLIANCE ................................................................ PAGE 16
B VENT DUAL APPLIANCE ................................................................... PAGE 17
CATEGORY I VENT INSTALLATION....................................................... PAGE 18

PAGE 1
WARNING:WARNING:
WARNING:WARNING:
WARNING: ALL INSTALLATIONS OF BOILERS AND VENTINGALL INSTALLATIONS OF BOILERS AND VENTING
ALL INSTALLATIONS OF BOILERS AND VENTINGALL INSTALLATIONS OF BOILERS AND VENTING
ALL INSTALLATIONS OF BOILERS AND VENTING
SHOULD BE DONE ONLY BY A QUALIFIED EXPERT AND INSHOULD BE DONE ONLY BY A QUALIFIED EXPERT AND IN
SHOULD BE DONE ONLY BY A QUALIFIED EXPERT AND INSHOULD BE DONE ONLY BY A QUALIFIED EXPERT AND IN
SHOULD BE DONE ONLY BY A QUALIFIED EXPERT AND IN
ACCORDANCE WITH THE APPROPRIATE UTICA BOILERS, INC.ACCORDANCE WITH THE APPROPRIATE UTICA BOILERS, INC.
ACCORDANCE WITH THE APPROPRIATE UTICA BOILERS, INC.ACCORDANCE WITH THE APPROPRIATE UTICA BOILERS, INC.
ACCORDANCE WITH THE APPROPRIATE UTICA BOILERS, INC.
MANUAL. INSTALLING OR VENTING A BOILER OR ANY OTHER GASMANUAL. INSTALLING OR VENTING A BOILER OR ANY OTHER GAS
MANUAL. INSTALLING OR VENTING A BOILER OR ANY OTHER GASMANUAL. INSTALLING OR VENTING A BOILER OR ANY OTHER GAS
MANUAL. INSTALLING OR VENTING A BOILER OR ANY OTHER GAS
APPLIANCE WITH IMPROPER METHODS OR MATERIALS MAY RESULTAPPLIANCE WITH IMPROPER METHODS OR MATERIALS MAY RESULT
APPLIANCE WITH IMPROPER METHODS OR MATERIALS MAY RESULTAPPLIANCE WITH IMPROPER METHODS OR MATERIALS MAY RESULT
APPLIANCE WITH IMPROPER METHODS OR MATERIALS MAY RESULT
IN SERIOUS INJURY OR DEATH DUE TO FIRE OR TO ASPHYXIATIONIN SERIOUS INJURY OR DEATH DUE TO FIRE OR TO ASPHYXIATION
IN SERIOUS INJURY OR DEATH DUE TO FIRE OR TO ASPHYXIATIONIN SERIOUS INJURY OR DEATH DUE TO FIRE OR TO ASPHYXIATION
IN SERIOUS INJURY OR DEATH DUE TO FIRE OR TO ASPHYXIATION
FROM POISONOUS GASES SUCH AS CARBON MONOXIDE WHICH ISFROM POISONOUS GASES SUCH AS CARBON MONOXIDE WHICH IS
FROM POISONOUS GASES SUCH AS CARBON MONOXIDE WHICH ISFROM POISONOUS GASES SUCH AS CARBON MONOXIDE WHICH IS
FROM POISONOUS GASES SUCH AS CARBON MONOXIDE WHICH IS
ODORLESS AND INVISIBLE.ODORLESS AND INVISIBLE.
ODORLESS AND INVISIBLE.ODORLESS AND INVISIBLE.
ODORLESS AND INVISIBLE.
HORIZONTHORIZONT
HORIZONTHORIZONT
HORIZONTALAL
ALAL
AL VENT PIPE INSTVENT PIPE INST
VENT PIPE INSTVENT PIPE INST
VENT PIPE INSTALLAALLA
ALLAALLA
ALLATION INSTRTION INSTR
TION INSTRTION INSTR
TION INSTRUCTIONSUCTIONS
UCTIONSUCTIONS
UCTIONS
(Through the wall)
THIS BOILER IS DESIGN CERTIFIED FOR USE WITH THE FOLLOWING VENTING
SYSTEMS.
COMPANY HEAT-FAB ®®
®®
®FLEX-L®®
®®
®Z-FLEX®®
®®
®ProTech®®
®®
®
PRODUCT SAF-T-VENT™STAR-34™Z-VENT™FasNSeal™
CAUTION:CAUTION:
CAUTION:CAUTION:
CAUTION: THE ABOVE VENT PIPE AND FITTINGS ARE USED FOR
VENTING GAS BURNING CATEGORY III AND IV APPLIANCES. DO NOT USE THIS
VENT PIPE OR FITTINGS FOR VENTING APPLIANCES BURNING FUELS SUCH AS
WOOD, OIL, KEROSENE OR COAL.
CAUTION:CAUTION:
CAUTION:CAUTION:
CAUTION: DO NOT USE THIS VENT PIPE AND FITTINGS FOR VENTING
INCINERATORS OF ANY KIND.
WARNINGS:WARNINGS:
WARNINGS:WARNINGS:
WARNINGS:
1. FOR CORRECT INSTALLATION OF VENT SYSTEM, READ ALL OF THESE
INSTRUCTIONS AND REFER TO THE VENT PIPE MANUFACTURER'S INSTRUCTIONS.
2. FAILURE TO USE THIS VENTING SYSTEM WILL VOID THE MANUFACTURER’S
WARRANTY AND MAY RESULT IN RAPID DETERIORATION OF THE VENTING SYSTEM,
A POTENTIAL HEALTH HAZARD.
3. FAULTY VENT INSTALLATION CAN ALLOW TOXIC FUMES TO BE RELEASED
INTO LIVING AREAS. THIS MAY CAUSE SERIOUS BODILY INJURY OR PROPERTY
DAMAGE. VENT PERFORMANCE MAY ALSO BE AFFECTED BY IMPROPER ASSEMBLY.
4. INSTALL SEPARATE VENTS FOR FORCED EXHAUST APPLIANCES AND
NATURAL DRAFT APPLIANCES. A COMMON VENT BETWEEN NATURAL DRAFT AND
FORCED EXHAUST APPLIANCES MAY CAUSE TOXIC GASES TO EXHAUST THROUGH
THE NATURAL DRAFT APPLIANCE RATHER THAN TO OUTSIDE AIR. BREATHING
EXHAUST GASES WILL CAUSE SERIOUS PERSONAL INJURY OR DEATH.

PAGE 2
HORIZONTAL VENT INSTALLATION:HORIZONTAL VENT INSTALLATION:
HORIZONTAL VENT INSTALLATION:HORIZONTAL VENT INSTALLATION:
HORIZONTAL VENT INSTALLATION:
A. The boilers covered in this section are design-certified as CATEGORY 3 for venting,
only when they are installed with manufacturer specified vent system components and
installation practices.
B. Install vent pipe beginning at the vent connector and work toward the vent cap.
C. Vent pipe and fittings MUST NOT be routed into, through, or within any other vent,
such as an existing masonry chimney or factory built chimney. (Recommended installation
is shown in figure 1 page 3, unacceptable installation is shown in figure 2 page 3).
D. Vent pipe lengths. The maximum length is the combined length of straight horizontal
and vertical runs, and the equivalent straight length of fittings. The required lengths for each
boiler are as follows:
VENT PIPE LENGTHS
Vent Pipe VENT LENGTHS EQUIV.
Model Dia. Maximum Minimum feet per fitting
DV38/100 3" 30' W/
Condensate 2' W/1 5'
Tee & 2 Elbows Elbow
DV125 3" 25' W/1 2' W/1 5'
Elbow Elbow
DV150/200 4" 30' W/1 2' W/1 5'
Elbow Elbow
Example: 20 feet of vent pipe w/1 elbow is Equivalent to 15 feet of vent pipe w/2
elbows. Note, condensate trap is not required on models DV150 thru 200.
E. The vent pipe should slope upward from the boiler at least 1 inch for every 4 feet.
F. No portion of the vent pipe should have dips or sags where condensate could collect,
see figure 3 on page 3 for a typical vent system.
G. Rigidly support vent pipe every 5 feet and at the elbows. Plumbers straps may be
used.
H. Clearances and enclosures. ALL vent pipe and fittings must be installed with
appropriate air space clearances to combustibles. These air space clearances apply to
indoor or outdoor vents, whether they are open, enclosed, horizontal or vertical or pass
through floors, walls, roofs, or framed spaces. The appropriate air space clearances should
be observed to joists, studs, subfloors, plywood, drywall, or plaster enclosures, insulated
sheathing, rafters, roofing, and any other combustible material. The minimum air space
clearance also applies to electrical wires and any kind of building insulation.
WARNING:WARNING:
WARNING:WARNING:
WARNING: DO NOT INSULATE OR OTHERWISE WRAP VENT PIPE OR
FITTINGS.
For Horizontal runsFor Horizontal runs
For Horizontal runsFor Horizontal runs
For Horizontal runs maintain a minimum air space clearance of 6 inches for 3 inch and
4 inch vent pipe to any combustible material, electric wires, and building materials.

PAGE 3
FIGURE 1b
FIGURE 2
FIGURE 3
FIGURE 1a

PAGE 4
FIGURE 4
TYPICAL INSTTYPICAL INST
TYPICAL INSTTYPICAL INST
TYPICAL INSTALLAALLA
ALLAALLA
ALLATIONTION
TIONTION
TION
Notes:
*1 : A condensate tee/drain is only needed when horizontal vent lengths exceed
10 feet.
*2 : Insert vent pipe in boiler venter outlet (vent adapter), apply silicone completely
around edge of outlet and tighten clamp.

Flex-L®Star-34™Vent Pipe Components
Notes:
*1 : A condensate tee/drain is only needed when horizontal vent lengths exceed
10 feet.
*2 : Insert vent pipe in boiler venter outlet (vent adapter), apply silicone completely
around edge of outlet and tighten clamp.
PAGE 5
FIGURE 5

Heat Fab®Saf-T Vent™Vent Pipe Components
PAGE 6
FIGURE 6
Notes:
*1 : A condensate tee/drain is only needed when horizontal vent lengths exceed
10 feet.
*2 : Insert vent pipe in boiler venter outlet (vent adapter), apply silicone completely
around edge of outlet and tighten clamp.

PAGE 7
FIGURE 7
Z-Flex®Z-Vent™Vent Pipe Components
Notes:
*1 : A condensate tee/drain is only needed when horizontal vent lengths
exceed 10 feet.
*2 : Insert vent pipe in boiler venter outlet (vent adapter), apply silicone
completely around edge of outlet and tighten clamp.

PAGE 8
FIGURE 8
ProTech®FasNSeal™Vent Pipe Components
Notes:
*1 : A condensate tee/drain is only needed when horizontal vent lengths
exceed 10 feet.
*2 : Insert vent pipe in boiler venter outlet (vent adapter), apply silicone
completely around edge of outlet and tighten clamp.

PAGE 9
LL
LL
LOCAOCA
OCAOCA
OCATINGTING
TINGTING
TING THETHE
THETHE
THE VENTVENT
VENTVENT
VENT TERMINTERMIN
TERMINTERMIN
TERMINAA
AA
ATIONTION
TIONTION
TION
A. At least 12 inches above finished grade, or at least 12 inches above the normally
expected snow accumulation level in geographical areas where snow accumulates.
B. 4 feet away from and not above any doors or windows.
C. At least 3 feet above any forced air inlet located within 6 feet horizontally.
D. At least 6 feet from a combustion air intake of another appliance.
E. At least 4 feet horizontally from electric meters, gas meters, regulators and relief
equipment.
F. Do not locate the vent termination in traffic areas like walkways, unless it is at least 7
feet above finished grade.
G. Do not locate the vent termination too close to shrubbery as flue products may stunt or
kill them.
H. Some building materials may be affected by flue products expelled near unprotected
surfaces. Sealing or shielding of exposed surfaces with a corrosion resistant material
(such as aluminum sheet) may be required to prevent staining or deterioration.
I. When installing vent cap secure it to a noncombustible wall or a combustible wall thimble.
Refer to vent pipe manufacturers instructions.
J. See the Federal Codes listed at the beginning of these instructions for additional
information on termination location.
FIGURE 9
CONDENSATE DRAINSCONDENSATE DRAINS
CONDENSATE DRAINSCONDENSATE DRAINS
CONDENSATE DRAINS
(Note: A condensate drain is not required on models DV150 thru 200)
WARNING:WARNING:
WARNING:WARNING:
WARNING: DO NOT PLACE CONDENSATE DRAIN WHERE FREEZING
MAY OCCUR.
CONDENSATE DRAINS ARE REQUIRED IN THE VENT WHEN USING THE
CONDENSATE TEE. THE CONDENSATE DRAIN FITTING MUST BE PLUMBED TO A
SANITARY DRAIN FOR LIQUID CONDENSATE DISPOSAL.
Refer to figure 9 below for the following instructions.
Condensate drain is plumbed with 3/8" (1 cm) inside diameter flexible tubing. Refer to
"GENERAL INSTRUCTION FOR SEASONAL STARTUP AND MAINTENANCE", in the
Installation Manual for maintenance
recommendations and schedule.
1. Flexible Tubing Condensate Drain.
In the vent, and close to the appliance, install
a tee with a run outlet. Install condensate
drain in the down outlet with high temperature
adhesive. Connect the condensate drain
outlet to commercially available flexible tubing
(minimum length 40"). Below the drain
outlet, make a 6" diameter loop in 3/8" ID
tubing, or a 9" diameter loop in 5/8" ID tubing.
Secure the loop with a plastic cable tie. Run
the other end of the flexible tubing to a
sanitary drain. (Use a condensate pump if
necessary)

PAGE 10
FIGURE 10
NOTE: IF THERE IS A POTENTIAL FOR EXCESSIVE WINDS, SPECIAL CONSIDERATION SHOULD BE GIVEN TO LOCATE THE VENT TERMINATION AWAY FROM THE WINDWARD SIDE OF THE BUILDING.

PAGE 11
VERVER
VERVER
VERTICALTICAL
TICALTICAL
TICAL VENT PIPE INSTVENT PIPE INST
VENT PIPE INSTVENT PIPE INST
VENT PIPE INSTALLAALLA
ALLAALLA
ALLATIONTION
TIONTION
TION
INSTRUCTIONSINSTRUCTIONS
INSTRUCTIONSINSTRUCTIONS
INSTRUCTIONS
(PROVIDING FOR PROPER VENTING THROUGH THE ROOF)
Vent boiler making Ref. to NFGC section 2 & 10 and using these instructions and the
requirements of the local utilities and other local code authorities. You must connect boiler to
a vent or factory-built chimney. Vent or factory-built chimney must meet a recognized standard.
Chimney lining method and material must comply with local code requirements. Use corrosion-
resistant material meeting nationally recognized standards for vent construction.
WARNING:WARNING:
WARNING:WARNING:
WARNING: Inadequate vent or chimney could allow combustion products
to collect in structure, resulting in injury or death.
WARNING:WARNING:
WARNING:WARNING:
WARNING: Vent this boiler separately from any appliance designed to burn
solid fuel, particularly wood burning or coal burning appliances. Improper venting could allow
combustion products to collect in the structure, resulting in injury or death.
A. VENTING CATEGORY
The boilers covered by this manual are design-certified as CATEGORY 1 for venting.
CATEGORY 1 Appliances have non-positive vent static pressure and rely on the heat
content of combustion products to vent. You may common vent CATEGORY 1 boilers.
The boilers covered by this manual are also design certified as CATEGORY 3 for
venting, only when they installed with manufacturer specified vent system components and
installed practices.(Ref. pages 1-10 for category 3 venting instructions)
B. DESIGN CONSIDERATIONS
1. Avoid oversizing boiler for your application. Select a boiler model with a rated heating
output close to the calculated heating load. This extends the firing period, decreasing the
potential for condensate formation in the vent.
2. Too small a vent cannot carry all combustion products outdoors. Too large a vent will
not vent combustion products rapidly enough to avoid potential for condensation. Refer to
pages 15 thru 18 for correct vent size.
3. Vent height must be a minimum of six feet. Minimize vent connector horizontal runs
to the extent possible for best performance.
4. The designer must consider the building’s orientation, answering these questions.
(Ref. pages 13-15)
A. Will the vent terminate outside the building where its operation could be
adversely affected by winds?
B. Could any adjacent buildings adversely affect vent operation?
C.Allowing for these factors can reduce the possibility of downdraft
conditions.
5. If your local experience indicates possible condensation problems, provide for
draining and disposal of venting system condensate.
C. VENT SIZING
1. Sometimes the horizontal distance from the boiler to the vent or chimney is already
given; this is known as the horizontal vent connector run. The vent or chimney height is also
usually given as the Btuh input of the gas appliances served by the vent.

PAGE 12
Check these parameters to be sure the venting system will work. Use approved engineering
practices and part 7 & 10 of the latest revision of the (NFGC) National Fuel Gas Code,
ANSI Z233.1/NFPA54.
2. Use this venting addendum for single appliance venting and multiple appliance
(common) venting. For multistory installations, refer to the latest revision of the National
Fuel Gas Code ANSI Z223.1/NFPA 54.
D. VENT CONNECTOR
1. Vent connectors must be made of noncombustible, corrosion resistant material
capable of withstanding vent gas temperatures. They must be thick enough to withstand
physical damage and be accessible for inspection, cleaning and replacement.
2. Use Type B 1 vent connector in or through attics, crawl spaces, or other cold areas.
Install thimbles that meet local codes when vent connectors pass through walls or partitions
of combustible material.
3. Keep vent connectors as short as possible by locating boiler as close as practical to
vent or chimney. Avoid unnecessary turns or bends which create resistance to flow of vent
gases. Adding an elbow adds resistance. For example, adding a 6" 90-degree elbow would
be the equivalent of adding 20 feet of horizontal 6" pipe. (45-degree elbows have lower
resistance than 90-degree elbows, and can work for most vent runs).
4. If you join two or more vent connectors before they enter the vertical vent or chimney, see
figure17,on page17. Also refer to NFGC book, ANSI standards and NFPA book.
5. Do not connect this boiler to any portion of a vent system which operates under
positive pressure. Positive pressure will result with CATEGORY 3 or 4 appliances that are
connected to the vent.
6. Do not connect vent connector to a chimney flue serving a fireplace.
E. VERTICAL VENT OR CHIMNEY
1. Vents and chimneys usually extend vertically with offsets not exceeding 45-degrees.
Consider vent pipe runs more than 45-degrees as horizontal runs. Include their length in
the total horizontal run.
2. Designer and installer must provide an appropriately sized common vent for all
appliances connected to it. (Ref. to figure 17, on page 17 or the latest revision of the NFGC)
3. Connect this CATEGORY 1 boiler only to vent systems with other CATEGORY 1
appliances.

PAGE 13
WARNING:WARNING:
WARNING:WARNING:
WARNING: Do not connect this CATEGORY 1 boiler to a vent system used
by a CATEGORY 3 and 4 appliance. Do not connect it to vents with mechanical draft
systems operating at positive pressure. Improper venting could allow combustion products
to collect in the structure during use, resulting in damage, injury or death.
F. CHIMNEY LINING
Use a suitably sized Type B1 vent liner or suitable corrigated liner. (See Figure 11 below)
WARNING:WARNING:
WARNING:WARNING:
WARNING: Support vent liner in a masonry chimney. Maintain at least 1"
clearance on all sides to reduce the possibility of condensate in vent. Condensate may
cause vent to deteriorate allowing combustion products to collect in structure, which could
result in injury or death. See Figure 12 below.
WARNING:WARNING:
WARNING:WARNING:
WARNING: Vent liner must not block opening where other appliance's vent
connectors enter chimney. Blocked openings will cause combustion products to collect in
the structure, resulting in damage, injury or death.
WARNING:WARNING:
WARNING:WARNING:
WARNING: Do not use unlined masonry chimneys. These increase risk of
condensate formation, which may cause chimney to deteriorate, allowing combustion
products to collect in the structure, resulting in damage, injury or death.
G. VENT TERMINATION
1. Terminate all vertical vents with a listed vent cap or roof assembly unless local codes
FIGURE 12
FIGURE 11

PAGE 14
require otherwise. See vent cap or roof assembly manufacturer’s instructions. Locate vent
termination (vent cap or roof assembly) in an area without positive pressures or eddy
currents. Eddy currents occur when air swirls over roof peaks. They cause down-drafts and
adversely affect vent operation. See Figure
13 at right. Some vent terminations or caps
protect against eddy currents and down-
drafts. Consult their manufacturer’s
instructions. Vent terminations or caps should
usually be at least the same size as the vent.
They may be larger if the installation
warrants.
2. Vent systems must end at least five
feet above the highest gas appliance
connection. The vent pipe must extend at
least three feet above the point where it
passes through the roof. Vent termination
must be at least two feet higher than any
portion of building within ten feet horizontal
and vent termination must be at least two
feet higher than roof peaks within ten feet
horizontal. See figures 14 and 15 below. Some vent cap manufacturers offer vent caps that
allow reduced clearances. Consult their instructions.
WARNING:WARNING:
WARNING:WARNING:
WARNING: Failure to properly terminate vent chimney systems could allow
combustion products to collect in the structure, resulting in injury or death.
3. Terminate venting system at least three feet above any forced-air building inlet within ten
feet. Consider doors, windows and gravity air building inlets. Locate vent termination at least
four feet below, four horizontal feet from or one foot above any of these openings.
FIGURE 13
FIGURE 14 FIGURE 15
TERMINATION 10' OR LESS FROM RIDGE TERMINATION MORE THAN 10' FROM RIDGE

PAGE 15
HEIGHT
ROOF PITCH ABOVE ROOF
FLAT TO 7/12 1.0 FT.
OVER 7/12 TO 8/12 1.5 FT.
OVER 8/12 TO 9/12 2.0 FT.
OVER 9/12 TO 10/12 2.5 FT. BRACE TO ROOF
OVER 10/12 TO 11/12 3.3 FT. AT TOP
OVER 11/12 TO 12/12 4.0 FT.
OVER 12/12 TO 14/12 5.0 FT.
OVER 14/12 TO 16/12 6.0 FT. BRACE TO ROOF
OVER 16/12 TO 18/12 7.0 FT. AT TOP AND
OVER 18/12 TO 20/12 7.5 FT. MID POINT
OVER 20/12 TO 21/12 8.0 FT.
ROOF PITCH CHART
H. INSTALLATION
1. Vent Adaptor.
Attach vent adaptor at draft inducer collar. See figure 18 on page 18. Use Kit #
56111101 for DV 50-125 and Kit # 56111102 for DV 150-200, or equivalent.
WARNING: Make sure that all vent pipe and connectors are secured because
unsecured vent pipe connections may loosen. This can allow combustion products to collect
in the structure, resulting in injury or death.
2. Vent Connector.
Install vent connectors without any dips or sags. Slope them upward from boiler at
least 1/4" per foot. To prevent sagging, at each joint support vent connectors and horizontal
portions using hangers, straps or equivalent. Seal all connections where vent connectors enter
chimney. See Figure 11 on page 13.
3. Vertical Vent
Install vent materials following their listing terms, manufacturer’s instructions, these
instructions and local codes. A gas vent passing through a roof must extend through roof
flashing, jack or thimble. It must terminate above the roof surface.(Ref. Figure 14 & 15)
I. EXISTING VENT CONSIDERATIONS
MASONRY CHIMNEYS PREVIOUSLY USED FOR VENTING EQUIPMENT SHOULD BE
SUITABLY PER NFGC STANDARD. Also provide an accessible clean out per the latest
revision of the NFGC, ANSI Z2231, AND NFPA 54.1
1. INSPECTION OF VENTS
A. Make sure existing vent or chimney is the proper size and construction for
appliances that will use it. The best way to do this is to size as if it were a new installation.
Compare the existing vent to your calculations and make necessary corrections.

B. Examine vent or chimney cleanouts to make sure they remain tightly closed when not
in use. Make sure vent or chimney passageway is clear and free of obstructions. Look for
evidence of condensate or deterioration in vent or chimney. Either of these means an
inadequate vent.
C. If you find an inadequate vent or chimney, do not leave it as is. Repair or replace
it. A new vent must meet these instructions and the latest revision of the National Fuel Gas
Code ANSI Z223.1/NFPA 54.
PAGE 16
FIGURE 16
VERVER
VERVER
VERTICALTICAL
TICALTICAL
TICAL VENTING INSTVENTING INST
VENTING INSTVENTING INST
VENTING INSTALLAALLA
ALLAALLA
ALLATION FOR (TYPE BTION FOR (TYPE B
TION FOR (TYPE BTION FOR (TYPE B
TION FOR (TYPE B VENT)*VENT)*
VENT)*VENT)*
VENT)*
MODEL D1 D2 D2
MIN MAX
DV50 4" 4" 5"
DV75 & 100 4" 4" 6"
DV125 4" 4" 8"
DV150 - 200 4" 5" 8"
NOTE: See below*
*The information contained in this figure is only one of many possible vertical
venting configurations. Follow appropriate sections of NFGC for proper
venting practice for category 1 appliances.

PAGE 17
FIGURE 17
VERVER
VERVER
VERTICALTICAL
TICALTICAL
TICAL VENTING INSTVENTING INST
VENTING INSTVENTING INST
VENTING INSTALLAALLA
ALLAALLA
ALLATION FORTION FOR
TION FORTION FOR
TION FOR
(TYPE B(TYPE B
(TYPE B(TYPE B
(TYPE B VENT)VENT)
VENT)VENT)
VENT) W/ NW/ N
W/ NW/ N
W/ NAA
AA
ATURAL DRAFTTURAL DRAFT
TURAL DRAFTTURAL DRAFT
TURAL DRAFT
WW
WW
WAA
AA
ATER HEATER HEA
TER HEATER HEA
TER HEATER (40,000 BTU/HR)*TER (40,000 BTU/HR)*
TER (40,000 BTU/HR)*TER (40,000 BTU/HR)*
TER (40,000 BTU/HR)*
MODEL D1 D2 D2
MIN MAX
DV50 4" 4" 4"
DV75 & 100 4" 5" 6"
DV125 & 150 4" 6" 8"
DV175 & 200 4" 7" 8"
NOTE: See below*
*The information contained in this figure is only one of many possible vertical
venting configurations. Follow appropriate sections of NFGC for proper
venting practice for category 1 appliances.

37616501 PAGE 18 REV. 4.1, March, 2004
FIGURE 18