Mendota CHELSEA M-27 User manual

CHELSEA
OPEN HEARTH TRUE ARCHED GAS DIRECT VENT FIREPLACE
Model M-27
INSTALLATION & OPERATING INSTRUCTIONS MANUAL
DOCUMENT NO. M27-0308
In the Commonwealth of Massachusetts:
Installation must be performed by a licensed plumber or
gas fitter;
A CO detector shall be installed in the room where the
appliance is installed.
WARNING: Improper installation, adjustment, altera-
tion, service or maintenance can cause injury or prop-
erty damage. Refer to this manual. For assistance or
additional information consult a qualified installer, ser-
vice agency or the gas supplier.
CAUTION
THESE INSTRUCTIONS ARE TO REMAIN WITH
THE HOMEOWNER.
WARNING
If the information in this manual is not followed exactly, a
fire or explosion may result causing property damage,
personal injury or loss of life.
Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or any
other appliance.
WHAT TO DO IF YOU SMELL GAS
Open windows.
Do not touch electrical switches.
Do not try to light any appliance.
Extinguish any open flame
Do not use the phone in your building.
Immediately call your gas supplier from a neighbor's
phone. Follow the gas supplier’s instructions.
If you cannot reach your gas supplier, call the fire
department.
FOR YOUR SAFETY
A qualified installer, service agency, or the gas suppli-
er must perform installation and service.
Do not store or use gasoline or other flammable va-
pors and liquids in the vicinity of this or any other ap-
pliance. WARNING
Do not operate this appliance with the glass removed,
cracked or broken. A licensed or qualified person
should do replacement of glass.
WARNING
Mendota gas fireplaces are heat producing appliances.
Do not burn wood, paper or other materials in this fire-
place. This fireplace is designed as a supplement
heat source. It is advisable to have an alternative pri-
mary heat supply.
WARNING
Do NOT use this appliance if any part has been under water.
Immediately call a qualified service technician to inspect the
appliance and to replace any part of the control system and
any gas control, which has been under water.
The installation must conform with local codes or, in
the absence of local codes, with the current National
Fuel Gas Code, ANSI Z223.1, or the current Natural
Gas and Propane Installation Code, CSA B149.1

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Table of Contents
SAFETY AND WARNING INFORMATION ................................................................................................................................................3
SPECIFIC REQUIREMENTS FOR THE COMMON WEALTH OF MASSACHUSETTS............................................................................4
CONGRATULATIONS ...............................................................................................................................................................................6
BUILDING PERMIT AND INSTALLATION INSPECTION APPROVAL REQUIREMENTS........................................................................6
GENERAL APPLIANCE SPECIFICATIONS ..............................................................................................................................................7
MANTEL CLEARANCES............................................................................................................................................................................8
CLEARANCES TO COMBUSTIBLES FROM APPLIANCE SURFACES...................................................................................................9
PLANNING THE INSTALLATION ............................................................................................................................................................10
FRAMING DIMENSIONS.........................................................................................................................................................................11
FRAMING DEPTH & FINISHING MATERIAL ..........................................................................................................................................12
ELEVATED FRAMING DIMENSIONS .....................................................................................................................................................13
GENERAL INFORMATION......................................................................................................................................................................14
GAS SUPPLY REQUIREMENTS.............................................................................................................................................................15
GAS PRESSURE REQUIREMENTS .......................................................................................................................................................16
GENERAL INSTALLATION INSTRUCTIONS..........................................................................................................................................17
GENERAL FLUE VENTING INSTRUCTIONS .........................................................................................................................................18
EXTERIOR VENT LOCATIONS AND RESTRICTIONS...........................................................................................................................19
FLUE VENTING COMPONENTS IDENTIFICATION...............................................................................................................................20
MASTER FLUE VENTING REQUIREMENTS CHART ............................................................................................................................21
IMPORTANT VENTING CONFIGURATION NOTES...............................................................................................................................22
APPROVED VENT SYSTEMS.................................................................................................................................................................23
VERTICAL RISE HORIZONTAL TERMINATION.....................................................................................................................................25
VERTICAL THROUGH-THE-ROOF VENTING........................................................................................................................................27
M-27 DOOR OPERATION .......................................................................................................................................................................30
REFRACTORY LINER REMOVAL AND INSTALLATION PROCEDURES..............................................................................................33
M-27 LOG SET INSTALLATION INSTRUCTIONS ..................................................................................................................................37
M-27 SURROUND KIT.............................................................................................................................................................................46
INSTALLATION CHECK OFF LIST..........................................................................................................................................................54
LIGHTING CHECK OFF LIST..................................................................................................................................................................54
LIGHTING INSTRUCTIONS ....................................................................................................................................................................55
THERMOSTAT OPERATION AND WALL SWITCH KIT CONNECTIONS..............................................................................................57
MAKING WIRE CONNECTIONS TO WALL SWITCH KIT #AA-11-00781...............................................................................................58
BLOWER SYSTEM INFORMATION........................................................................................................................................................59
TROUBLE SHOOTING THE M-27 FIREPLACE......................................................................................................................................60
CUSTOMER INFORMATION...................................................................................................................................................................61
MAINTENANCE .......................................................................................................................................................................................62
BURNER FLAMES GENERAL HEIGHT DIAGRAM.................................................................................................................................63
NATURAL TO LP GAS CONVERSION....................................................................................................................................................64
LP GAS PRESSURE REQUIREMENTS..................................................................................................................................................65
VALVE ASSEMBLY REPLACEMENT PARTS.........................................................................................................................................68
GLASS FRAME ASSEMBLY REPAIR AND REPLACEMENT.................................................................................................................69
MENDOTA WARRANTY QUALIFICATION & SERVICE REFERENCE FORM......................................................................................71
MENDOTA EXTENDED LIFETIME PROTECTION AND LIMITED WARRANTY ....................................................................................75

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SAFETY AND WARNING INFORMATION
READ and UNDERSTAND all instructions carefully before starting the appliance. FAILURE TO FOLLOW these instruc-
tions may result in a possible fire hazard and will void the warranty.
Any safety screen or guard removed for servicing must be replaced before operating this appliance.
DO NOT USE this appliance if any part has been under water. Immediately CALL a qualified service technician to inspect
the appliance and to replace any part of the control system and any gas control, which has been underwater.
THIS UNIT IS NOT FOR USE WITH SOLID FUEL.
Installation and repair should be PERFORMED by a qualified service person. The appliance and venting system should
be INSPECTED before initial use and at least annually by a professional service person. More frequent cleaning may be
required due to excessive lint from carpeting, bedding, material, etc. It is IMPERATIVE that the unit’s control compart-
ment, burners, and circulating air passageways ARE KEPT CLEAN to provide for adequate combustion and ventilation
air.
Always KEEP the appliance clear and free from combustible materials, gasoline, and other flammable vapors and liquids.
NEVER OBSTRUCT the flow of combustion and ventilation air. Keep the front of the appliance CLEAR of all obstacles
and materials for servicing and proper operation.
Due to high temperature, the appliance should be LOCATED out of traffic areas and away from furniture and draperies.
Clothing or flammable material SHOULD NOT BE PLACED on or near the appliance.
Children and adults should be ALERTED to the hazards of high surface temperature and should STAY AWAY to avoid
burns or clothing ignition. Young children should be CAREFULLY SUPERVISED when they are in the same room as the
appliance.
These units MUST use one of the vent systems described in the Installing Your Fireplace section of the Installers Guide.
NO OTHER vent systems or components MAY BE USED.
This gas fireplace and vent assembly MUST be vented directly to the outside and MUST NEVER be attached to a chim-
ney serving a separate solid fuel-burning appliance. Each gas appliance MUST USE a separate vent system. Common
vent systems are PROHIBITED.
If the vent-air intake system is disassembled for any reason, reinstall per the instructions provided for the initial installa-
tion.
The vent system assembly for this fireplace must be periodically examined by a qualified service agency.
INSPECT the external vent cap on regular basis to make sure that no debris is interfering with the airflow. The flow of
combustion and ventilation air not to be obstructed
DO NOT abuse the glass door by striking the glass, slamming the door shut, etc.
Use only authorized parts and materials obtained from Johnson Gas Appliance Company when replacing defective or
damaged glass.
DO NOT USE abrasive cleaners on the glass door assembly. DO NOT ATTEMPT to clean the glass door when it is hot.
Turn off the gas before servicing this appliance. It is recommended that a qualified service technician perform an appli-
ance check-up at the beginning of each heating season.
DO NOT place furniture or any other combustible household objects within 36 inches of the fireplace front.

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Specific Requirements for the Common Wealth of Massachusetts
The information in this section applies to all installations performed in the Common Wealth of Massachusetts only.
a) For all side wall horizontally vented gas fueled equipment installed in every dwelling, building or structure
used in whole or in part for residential purposes and where the side wall exhaust vent termination is less than
seven (7) feet above grade, the following requirements shall be satisfied:
1. If there is no carbon monoxide detector with an alarm already installed in compliance with the most cur-
rent edition of NFPA 720, NFPA 70 and the Massachusetts State Building code in the residential unit
served by the side wall horizontally vented gas fueled equipment, a battery operated carbon monoxide
detector with an alarm shall be installed in compliance with the most current edition of NFPA 720. NFPA
70 and the Massachusetts State Building Code.
2. In addition to the above requirements, if there is not one already present, a carbon monoxide detector
with an alarm and a battery backup shall be installed and located in accordance with the installation re-
quirements supplied with the detector on the floor level where the gas equipment is installed. The carbon
monoxide detector with an alarm shall comply with 527 CMR, ANSI/UL 2034 Standards or CSA 6.19 and
the most current edition of NFPA 720. In the event that the requirements of this subdivision cannot be
met at the time of the completion of the installation of the equipment, the installer shall have a period of
thirty (30) days to comply with this requirement; provided, however, that during said thirty (30) day period,
a battery operated carbon monoxide detector with an alarm shall be installed in compliance with the most
current edition of NFPA 720, NFPA 70 and the Massachusetts State Building Code. In the event that the
side wall horizontally vented gas fueled equipment is installed in a crawl space or an attic, the carbon
monoxide detector may be installed on the next adjacent habitable floor level. Such detector may be a
battery operated carbon monoxide detector with an alarm and shall be installed in compliance with the
most current edition of NFPA 720, NFPA 70 and the Massachusetts State Building Code.
3. A metal or plastic identification plate shall be permanently mounted to the exterior of the building at a min-
imum height of eight (8) feet above grade directly in line with the exhaust vent terminal for the horizontally
vented gas fueled heating appliance or equipment. The sign shall read, in print size no less than one-half
(1/2) inch in size, “GAS VENT DIRECTLY BELOW, KEEP CLEAR OF ALL OBSTRUCTIONS”
4. A final inspection by the state or local gas inspector of the side wall horizontally vented equipment shall
not be performed until proof is provided that the state or local electrical inspector having jurisdiction has
granted a permit for installation of carbon monoxide detectors and alarms as required above.
(b) EXEMPTIONS: The following equipment is exempt from 248 CMR 5.08(2) (a) 1 through 4:
1. The equipment listed in Chapter 10 entitled “Equipment Not Required To Be Vented” in the most current
edition of NFPA 54 as adopted by the Board; and
2. Product Approved side wall horizontally vented gas fueled equipment installed in a room or structure sepa-
rate from the dwelling, building or structure used in whole or in part for residential purposes.
(c) When the manufacturer of Product Approved side wall horizontally vented gas equipment provides a venting
system design or venting system components with the equipment, the instructions for installation of the
equipment and the venting system shall include:
1. A complete parts list for the venting system design or venting system; and
2. Detailed instructions for the installation of the venting system design or the venting system components.
(d) When the manufacturer of a Product Approved side wall horizontally vented gas fueled equipment does not
provide the parts for venting the flue gases, but identifies “special venting systems”, the following shall be sat-
isfied:
1. The referenced “special venting system” instructions shall be included with the appliance or equipment in-
stallation instructions; and
2. The “special venting systems” shall be Product Approved by the Board, and the instructions for that sys-
tem shall include a parts list and detailed installation instructions.
(e) A copy of all installation instructions for all Product Approved side wall horizontally vented gas fueled equip-
ment, all venting instructions, all parts lists for venting instructions, and/or all venting design instructions shall
remain with the appliance or equipment at the completion of the installation.

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SPECIFICATIONS
MODEL M-27
High Fire - Adjustable to - Low Fire
BTUH. (MODEL M-27) NAT. GAS 27,000 6,750
BTUH. (MODEL M-27) LP GAS 25,000 7,000
NOTE: LPG CONVERSION KIT, #HA-48-00025, MUST BE PURCHASED
SEPARATELY TO CONVERT TO BURN LPG IN THIS FIREPLACE.
MAIN ORIFICE [0-2000ft (610 m)]: REAR BURNER: #45 NAT. GAS [#56 L.P. GAS] – FRONT BURNER: #51 NAT. [#59 LP]
OVERALL EFFICIENCY: ..................... EXCEEDS D.O.E. EFFICIENCY REQUIREMENTS (A.F.U.E.) FOR DIRECT VENT
WALL HEATERS.
CO-AXIAL DIRECT VENT FLUE: ..........4" INNER, 6 5/8" OUTER
TOTAL WEIGHT: ...................................175 POUNDS
SAFETY: ................................................AGA CERTIFIED PILOT GENERATOR, MILLIVOLT SYSTEM
ACTIVATED WITH SWITCH, THERMOSTAT OR REMOTE CONTROL.
APPLIANCE CERTIFICATION AND TESTING AGENCY
INTERTEK TESTING SERVICES, ICBO#AA647-4
Certified under ANSI Z21.88 (2002) CSA 2-33 (2002) “Vented Gas Fireplace Heaters" not for use with solid fuel. Approved for bed-
room installations and mobile homes. UL307B approved for "mobile homes, after first sale of home, not for recreational vehicles."
GAS REQUIREMENTS..........................SUPPLY PRESSURE: GAS INLET: 1/2" N.P.T.
NAT. GAS: 7" W.C. (5" W.C. MIN., 11" W.C. MAX.)
L.P. GAS: 11.0" W.C. (11" W.C. MIN., 13" W.C. MAX.)
ELECTRICAL REQUIREMENTS...........115 VOLT, LESS THAN 1.4 amps (for blower operation only)
APPROVED VENT SYSTEMS...............DURAVENT
MINIMUM CLEARANCES TO COMBUSTIBLE CONSTRUCTION
UNIT TO FLOOR 0in. (0mm) GLASS EDGE TO ADJACENT SIDEWALL 12in. (305mm)
UNIT TO ENCLOSURE SIDEWALL 0in. (0mm) VENT PIPE TOP TO COMBUSTIBLES 2in. (51mm)
UNIT TO ENCLOSURE BACK WALL 1in. (25mm) VENT PIPE SIDES TO COMBUSTIBLES 1in. (25mm)
UNIT TOP TO ENCLOSURE CEILING 1-5/8in. (41mm) VENT PIPE BOTTOM TO COMBUSTIBLES 1in. (25mm)
UNIT TOP TO ROOM CEILING 23-1/2in. (597mm)
8” MANTLE ABOVE DISCHARGE AIR OPENING 13in. (330 mm)
THIS FIREPLACE INCLUDES A SEALED COMBUSTION SYSTEM, 7-PIECE CERAMIC FIBER LOG SET & COALS, FIREBRICK
LINED FIREBOX, NEO-CERAM GLASS, PIEZO IGNITER, DUAL BLOWERS, AGA CERTIFIED SAFETY SYSTEM, and WALL
THERMOSTAT.
OPTIONS: BLACK, NATURAL IRON, SWEDISH NICKEL, 24K GOLD FILIGREE, OR CAST IRON DECORATIVE FRONTS.
CAUTION
THESE INSTRUCTIONS ARE TO
REMAIN WITH THE HOMEOWNER.
NOTE: This installation must conform to local codes. In the absence
of local codes, you must comply with the National Fuel Gas Code,
ANSI Z223.1-latest edition in the U.S.A. and the Natural Gas and
Propane Installation Code, CSA B149 Installation Codes in Cana-
da.
This appliance may be installed in an
aftermarket, permanently located,
manufactured home (USA only) or
mobile home, where not prohibited
by local codes.
This appliance is only for use with
the type(s) of gas indicated on the
rating plate.
WARNING: Do not operate this appliance with the glass removed,
cracked or broken. A licensed or qualified person should do re-
placement of glass.
WARNING: Do not operate this appliance with the glass removed,
cracked or broken. A licensed or qualified person should do re-
placement of glass.
HIGH ALTITUDE INSTALLATION INFORMATION: Prior to installing at altitudes higher than 7500, please con-
tact the Mendota technical service department for specific venting requirements and venting restrictions.

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CONGRATULATIONS
You are the owner of a world-class heat producing gas direct vent sealed combustion fireplace.
This elegant, highly efficient Fireplace will be a constant source of comfort and fascination. It will be the focal point of
beauty and interest in your home.
The Mendota Gas Fireplace is a true heating appliance incorporating the traditional aesthetics of fireplace fire viewing
with the controllability and fuel efficiency of a home gas furnace. Of particular interest is the low fuel consumption and bril-
liant fire viewing afforded by the realistic HearthGlo wood fire-like combustion system.
Carefully read the following instructions prior to actual installation. Proper Mendota Gas Fireplace installation and opera-
tion will give you years of safe, trouble free comfort and enjoyment.
If you have any questions regarding installation or operation of your Mendota Fireplace please contact your local dealer.
...CAUTION...
Due to high temperatures, the Fireplace should be located out of traffic and away from furniture and draperies. Children
and adults should be alerted to the hazards of high surface temperature and should stay away to avoid burns or clothing
ignition. Young children should be carefully supervised when they are in the same room as the Mendota Gas Fireplace.
Clothing or other flammable material should not be placed on or near the Fireplace.
Any safety screen or guard removed for servicing an appliance must be replaced prior to operating this appliance.
The Mendota Gas Fireplace is a powerful and efficient heating unit. It has been designed as a major source of supple-
mental heat. As with any mechanical appliance there can be component shut downs. It is advisable to have an alternate
heat supply.
Installation, repair and any adjustments to logs or burner must be done by a qualified service person. The appliance
should be inspected before use and at least annually by a professional service person. More frequent cleaning may be
required due to excessive lint from carpeting, bedding material, carbon build-up, etc. It is imperative that control com-
partments, burners and circulating air passageways of the appliance be kept clean. The burner and pilot flames and logs
should be visually checked periodically.
DO NOT use this appliance if any part has been under water or exposed to moisture corrosion. Immediately call a quali-
fied service technician to inspect the Fireplace and replace any part of the control system and any gas control, which has
been under water. DO NOT use this fireplace if the burner does not light immediately. Turn unit off and call Mendota ap-
proved service person if there is any delay in burner light off.
It is Johnson Gas Appliance Company's policy that no responsibility is assumed by the Company or by any of its employ-
ees or representatives for any damages caused by an inoperable, inadequate, or unsafe condition which is the result, ei-
ther directly or indirectly, of any improper operation, installation or servicing procedures.
Building Permit and Installation Inspection Approval Requirements
All installations of Mendota Fireplaces and Inserts must comply with all the requirements stated in this Installation and
Operating Instructions Manual. The Dealer and/or installer must also obtain all required Building Permits and Inspection
Approval from the local building inspection department or the local body having jurisdiction. In order to validate warranty
coverage, Mendota may require facsimile copies of the Building Permit and Inspection Approval forms. Failure to provide
adequate proof that the installation conforms to all local requirements and the requirements stated in the Installation and
Operating Instructions Manual will void all applicable warranty.
INSTALLER: THESE INSTRUCTIONS ARE TO REMAIN WITH HOMEOWNER.
HIGH ALTITUDE INSTALLATION INFORMATION: Prior to installing at altitudes higher than 7500, please con-
tact the Mendota technical service department for specific venting requirements and venting restrictions.

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491
8"
245
8"
2.5478
3.7255
34
4
11-1/4"
14" MIN.
DEPTH
5-1/2" TO VENT
PIPE CENTER
205
8"
8" DEEP COMBUSTIBLE MANTEL
1"
1" MINIMUM
12" MINIMUM FROM WALL TO
VISIBLE GLASS EDGE.
OR 8-3
8" FROM SIDE OF FIREPLACE.
5/8" min. from unit front edge to back
edge of hearth pad. Spacer is installed on fireplace.
12" min. Non-combustible Hearth protection required
[SEE HEARTH PROTECTION PAD R-RATING, PAGE 12]
11
4" HEARTH PAD HEIGHT
(MIN R-1 RATING)
IS RECOMMENDED
1" MIN. CLEARANCE
TO VENT COMPONENTS
47"
293
4"
37"
45°
ADJACENT WALLS:
A wall perpendicular to and in front of this fireplace's
glass door surface must be at least 12 inches from the
side edges of the visible glass.
A wall at 45° to the glass surface and starting at this
Fireplace's outer edge is permitted. Projections behind
this wall (in shaded area) are permitted.
NOTE: For every 1" this fireplace is raised off the floor,
the non-combustible hearth protection pad may be reduced
by 2". If this fireplace is raised off the floor more than 6",
No hearth protection pad is required.
11-1/4"
47" MIN.
UNIT BASE
TO 8" MANTEL
8" MANTEL DEPTH
AT HEIGHTS SHOWN
13" 60" MIN.
TO ROOM CEILING
CEILING
MINIMUM ROUGH FRAMING DIMENSIONS
HEIGHT 49"
WIDTH 29-12"
DEPTH 14"
FROM UNIT BASE
TO ROOM CEILING 60"
FROM UNIT BASE
TO 8" MANTEL 47"
361
4"
49" MIN.
ROUGH FRAMING
HEIGHT
291
2" MIN.
FRAMING WIDTH
143
4"
0"
1"
2"
3"
4"
5"
6"
7"
8"
5"
6"
7"
8"
9"
10"
11"
12"
13"
HEIGHT ABOVE
CONVECTION AIR OPENING
DISTANCE FROM
FIREPLACE FACE
APPROVED MANTEL PROFILE
383
4"
449
16"
TO CENTERLINE
OF VENT CAP
18" MIN
TO SOFFIT
NON
COMBUSTIBLE
M-27 GAS DIRECT VENT FIREPLACE
GENERAL APPLIANCE SPECIFICATIONS
Figure 1: General Appliance Specifications
HIGH ALTITUDE INSTALLATION INFORMATION: Prior to in-
stalling at altitudes higher than 7500, please contact the Mendota
technical service department for specific venting requirements and
venting restrictions.

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8" DEEP COMBUSTIBLE MANTEL
MANTEL CLEARANCES
Mantel Clearances for this fireplace may be
measured from the top of the convection air
opening or the floor level of this fireplace.
The location that is referenced normally to
measure mantel clearances is the Top of the
Convection Air Opening. For ease, however,
measure up from the floor level of this fire-
place. The chart and diagram, in this page,
provide all the reference dimensional infor-
mation necessary in determining the distance
a combustible mantel may protrude out from
the face surface of this fireplace. The Chart,
at left, shows the Distance From Fireplace
Face the combustible mantel may protrude
outward at a Distance Up From Floor Level of
this Fireplace.
If you prefer to take measurements from the Top
of the Convection Air Opening, note that the Top
of the convection air opening is 34 inches up
from the floor level of this fireplace.
WARNING: Make proper use of this chart. Do
not compromise the specifications contained in
this chart.
Failure to adhere to proper clearances required
to combustibles may cause spontaneous com-
bustion of the mantel and may result in property
damage, personal injury or loss of life.
Figure 2: Mantel Clearances

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CLEARANCES TO COMBUSTIBLES FROM APPLIANCE SURFACES
Figure 3: Clearances to Combustibles
CLEARANCE
FROM TOP OF ARCHED OUTER SKIN
TO COMBUSTIBLE FRAMING
1-5/8" MINIMUM

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PLANNING THE INSTALLATION
When planning on appliance installation, it is necessary to determine the following information before installing:
Where the appliance is to be installed.
The vent system configuration to be used.
Gas supply piping.
Electrical Wiring.
Framing and finishing details.
Whether accessories such as a wall switch, remote control, and ceiling fan are desired.
Selecting Appliance Location
When selecting a location for your appliance, it is important to consider the required clearances to walls. See Figure 1:
General Appliance Specifications and Figure 3: Clearances to Combustibles.
Figure 4: Planning Installation
WARNING
FIRE RISK- ODOR RISK
Install appliance on hard metal or wood surfaces extending full width and depth of this
fireplace.
Do NOT install this fireplace directly on carpeting, vinyl or any combustible material other
than wood. Construct chase to all clearance specifications in manual.
Locate and install appliance to all clearance specifications in manual.
491
8"
245
8"
343
4"
11-1/4"
11-1/4"
14"
291
2"
291
2"
14"
IN ADDITION TO THESE DIMENSIONS, ALSO REFERENCE
MANTEL CLEARANCES SECTION
FRAMING DIMENSIONS SECTION
VENTING CONFIGURATION SECTION

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9"
1"
TOP
PLATE
NOTCH
FRAMING DIMENSIONS
Minimum Rough Framing Dimensions
DESCRIPTION DIMENSION
(INCHES)
A Width 29-1/2
B Height 49
C
DEPTH (assumes that 3/4” thick plywood
is used as facing material. Reduce depth
(C) for thicker facing materials. See Fac-
ing Materials Section.)
13-1/4
D Vent opening height 10-1/4
E Vent opening width 9-1/4
Rough Framing Height
The Rough Framing Height must be maintained to allow this fireplace
and the 90-degree elbow connected directly to the top, on certain vent
systems, to slide into the framing cavity. Once the fireplace is posi-
tioned inside the framed cavity, a secondary nailer stud should be add-
ed at a minimum height of 38 inches above the floor level of this
fireplace. The nailer stud will allow for securing facing materials.
Special consideration for vertical vent systems
If a straight-up vertical vent system is being considered, the top plate on
the front wall of the chase will need to be notched to allow the proper 1”
clearance from the top plate to the vertical vent pipe. Furthermore, all
framing headers and members that are located within the 1” clearance requirement to the vent stack or vent components
must be positioned on edge (on the 1-1/2” edge) to allow
proper clearance to the vent stack or component. See
Figure 6.
Constructing the Appliance Chase
A chase is a vertical box-like structure built to enclose
this fireplace and its vent system. Vertical vents that run
on the outside of a building may be, but are not required
to be, installed inside a chase.
Construction of the chase may vary with the type of build-
ing. These instructions are not substitutes for the re-
quirements of local building codes. Local building codes
MUST be adhered to.
Chases should be constructed in the manner of all out-
side walls of the home to prevent cold air drafting prob-
lems. The chase should not break the outside building
envelope in any manner.
Wall, ceiling, base plate and cantilever floor of the chase
should be insulated. Vapor and air infiltration barriers
should be installed in the chase as per regional codes for
the rest of the home. Additionally, in regions where cold
air infiltration may be an issue, the inside surfaces of the
chase may be sheet rocked and taped for maximum air
tightness.
To further prevent drafts, the firestops should be caulked
with high temperature caulk to seal the gaps. Gas line
holes and other openings should be caulked with high
temp caulk or stuffed with unfaced insulation. If the ap-
pliance is being installed on a cement slab, a layer of
plywood may be placed underneath this fireplace to prevent conduct-
ing cold up into the room.
Figure 5: Framing
Figure 6: CLEARANCE TO VERTICAL VENT

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14.00
12.00 min
2.00
1" min
Finish Material
Sub Layer
Framing
Framing Depth & Finishing Material
Finish
Material
Thickness
Max.
Framing
Depth
½” 13 ½”
¾” 13 ¼”
1” 13”
1 ¼” 12 ¾”
1 ½” 12 ½”
1 ¾” 12 ¼”
2” 12”
Figure 8: Finishing Material Cutting Dimensions
287
8
369
16
R147
16
221
8
REF
REF
Figure 7: Framing Depth

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36" 313
4"
49"
31
2"3
4"
60" MINIMUM
CEILING
291
2"
ELEVATED FRAMING DIMENSIONS
This fireplace may be installed in an elevated position by created an elevated deck and an appropriate framed en-
closure.
NOTE: This fireplace may be elevated but
MUST allow a minimum of 60” dis-
tance between this fireplace’s floor
level and the ceiling.
Hearth Protection R Rating: MINIMUM R-1 IS REQUIRED. USE OF A ½” THICK (MINIMUM) CEMENT BOARD
(Hardibacker, Wonderboard or other brand) plus ¼” thick mortar (ThinSet type) plus ¼” thick ceramic tile exceed
the R-1 requirement. Use this as a reference, if in doubt. Natural Stones of 1” or greater thickness also exceed R-
1 rating.
All hearth pads must be non-combustible (metal, brick,
stone, or mineral fiberboard). Do not use any combustible
material to protect the floor in front of this fireplace. For
the M-27, the hearth protection pad must be rated at R-1
minimum.
Use the following procedure to determine if a hearth pad
meets the requirements listed in this manual. Find the avail-
able values, R, K or C and follow the formulae below to ar-
rive at a R value.
R-value = Thermal Resistance
K-value = Thermal Conductivity
C-value = Thermal Conductance
Convert the specification to R-value;
a. If R-value is given, no conversion is needed.
b. If K-value is given with a required thickness (t) in inches:
R = 1/K x T ( 1 divided by K , then multiplied by thickness).
c. If C-value is given: R = 1/C (1 divided by C value given).
Determine the R-value of the proposed hearth pad. For
multiple layers, add R-values of each layer to determine
overall R-value.
If the overall R-value of the system is greater than R-1, then
the proposed hearth pad is acceptable.
Example:
If the specified hearth pad should be ¾” thick material with a
K-factor of 0.84. The proposed alternate is 1/4” tile with a C-
factor of 1.25 over 1/8” mineral board with a K-factor of 0.29
Step A. Use formula to convert specifications to R-value.
R = 1/K x T = (1/0.84) x 0.75” = 0.893
Step B. Calculate R of proposed system. 1/4” tile with C = 1.25.
R of the tile = 1/C = 1/1.25 = 0.80; 1/8” mineral
board of K = 0.29, therefore R mineral board = 1/0.29
x 0.125 = 0.431; Total R = R tile + R mineral board
= 0.8 + 0.431 = 1.231.
Step C. Compare proposed system R = 1.231 to specified R
of 0.893. Since R is greater than required, the system
is acceptable.
Figure 9: Elevated
Framing Dimensions
5/8" min. from unit front edge to
back edge of hearth pad. Spacer
is installed on fireplace.
12" min. Non-combustible Hearth
protection required [SEE HEARTH
PROTECTION PAD R-RATING, PAGE 12]
11
4" HEARTH PAD HEIGHT
(MIN R-1 RATING)
IS RECOMMENDED

- 14 -
GENERAL INFORMATION
Your Mendota Gas Fireplace has a state-of-the-art co-axial direct vent, sealed combustion system. This advanced and highly
efficient system brings in outside air for combustion, has a separate exhaust vent and efficiently heats and re-circulates room air.
The Mendota system maintains high air quality, maximizes efficiency and assures proper operation in today's "air-tight" homes.
SAFETY AND STRUCTURAL CONCERNS:
The M-27 Fireplace must be installed and serviced by a Mendota approved serviceperson. Any adjustments to burner, pilot,
logs or coal bed must be made by a Mendota approved service person. Pilot system voltage must be checked with a voltmeter.
Pilot system thermopile must register a minimum of 325 mV on a voltmeter. If pilot goes out, always wait five (5) minutes before
attempting to relight pilot, always open glass door before lighting pilot light.
VENTING REQUIREMENTS:
This Mendota Fireplace can be vented using DURAVENT brand coaxial pipe (4”X6-5/8”) off the top. Use only Mendota specified
vents and vent caps when installing your fireplace. Closely follow venting locations, directions and requirements. Observe the
restrictions relating to vent position on exterior of home (see Figure 14). Be sure all vent pipe sections are fully twist-locked and
leak-proof. Be sure 1000ºSilicate Stove Sealant is used on the inner pipe joints of all Simpson DuraVent pipe components and
all adjustable pipe sections.
WARNING: ALWAYS REMOVE THE GLASS DOOR WHEN LIGHTING THE PILOT.
The burners must light immediately & the flame must travel promptly and smoothly around "curves" and light entire burner. The
flame must not "lift" off burner. DO NOT operate unit if burner does not light immediately or if flame lifts off burner.
The Mendota Direct Vent Fireplace may be placed within 12 inches of adjacent sidewalls. The fireplace may be placed directly
on concrete or wood flooring. If the appliance is to be installed on carpeting, vinyl or other combustible material other than wood
flooring, the appliance shall be installed on a metal or wood panel extending the full width and depth of the appliance. An 8”
combustible mantel may be installed at a minimum of 13" above top of the heat outlet (47” up from the floor level of this fire-
place) and no more than 8" out from wall at that height. Non-combustible (marble, brick, stone, etc.) mantels or mantels with
steel protector plate on underside can be installed at any desired height above decorative front.
Never block off convection air openings or paths. Always use Mendota decorative fronts and Mendota approved vent systems
and vent caps.
A non-combustible hearth protector with a total insulation rating of R-1 is required when installing this fireplace directly on the
floor and must extend a minimum of 12" in front of the fireplace. For every 1 inch the fireplace is raised off the floor, the depth of
the hearth protector may be reduced by 2 inches. If fireplace is raised off the floor 6" or more, no hearth protector is required.
HEATING PERFORMANCE:
Mendota Gas Built-in Fireplaces are true, high efficiency gas heaters. With its high heat output the Mendota Fireplace will heat a
large area of your home if situated to maximize heat/ air circulation. Air movement options for maximizing heat circulation that
can be considered are through-the-wall grills or floor grills, the continuous operation of central heating furnace blowers, or ceiling
fans. The most efficient method for overall heat distribution within a single room is a ceiling fan. The heat output of the
Fireplace can be reduced to a low 6,750 BTUH by turning off the Rear Burner and turning the Hi/Lo pressure regulator knob on
the gas valve, counter clockwise, from "Hi" to "Lo". Blower can be turned down or turned off to reduce heat output.
AESTHETIC CONSIDERATIONS:
Burning or static fireplaces are a major aesthetic focus in any room. Locate your gas fireplace as you would a television set.
The Mendota Hearth Gas Fireplace will be a continuing source of comfort and fascination. Corner installations will afford you the
greatest potential for viewing in many rooms. We suggest installing this Mendota Fireplace a minimum of 12 inches above the
floor by utilizing an elevated hearth. This fireplace may be installed in an elevated position as long as 64 in. minimum distance is
provided between the floor level of this fireplace and the room’s ceiling surface.
ELECTRICAL REQUIREMENTS:
Dual Blowers are included in this Mendota Direct Vent Fireplace. A 115-volt electrical service must be supplied at the fireplace
location at the time of installation. It must be electrically grounded in accordance with local codes, or in their absence, with the
current edition of the National Electric Code ANSI/NFPA 70. Use of a wall switch control in the power supplied to this fireplace is
allowed.
NOTE: The blower output can be adjusted with the rheostat. There will be delays in blower operation during "heat-up" (approx. ½ hr.)
and extended blower operation during "cool-down" (approx. ½ hr.).
Thermostat wire should be run from desired thermostat (or "on/off" switch) location to the main gas valve (located on the left
side) – see thermostat installation section.
HIGH ALTITUDE INSTALLATION INFORMATION: Prior to installing at altitudes higher than 7500, please con-
tact the Mendota technical service department for specific venting requirements and venting restrictions.

- 15 -
GAS SUPPLY REQUIREMENTS
Correct gas pressure and proper gas supply line sizing is impera-
tive to the successful performance of your Mendota gas fireplace.
Be sure the gas supplier or plumber carefully checks for correct gas
pressure and gas line sizing when installing the fireplace.
It is critical to carefully check for gas leaks when hooking up the
fireplace -- check with soap & water solution.
Be sure to install "approved" flex gas line with brass-to-brass
fittings to prevent gas leaks at connections.
Gas supply piping must include a drip leg to eliminate the pos-
sibility of contaminants entering the gas train.
Adhere strictly to local and national codes for entire installation.
Correct gas pressure and proper gas supply line sizing is im-
perative to the
GAS SUPPLY LINE SIZING
The Mendota Gas Fireplace comes equipped with a 1/2" N.P.T.
Female inlet on a Street Elbow. Gas supply piping must enter the
Fireplace cabinet on the left side.
An approved manual shut-off ball valve is supplied in the fireplace.
The appliance and its individual shut-off valve must be disconnect-
ed from the gas supply piping system during any pressure testing of
that system at test pressures in excess of ½ PSIG (3.5 kPa).
The appliance must be isolated from the gas supply piping system
by closing its manual shut-off ball valve during any pressure testing
of the gas supply piping system at test pressures equal to or less
than 1/2 PSIG (3.5 kPa).
A proper gas line diameter must be selected to run from the supply
regulator to the Fireplace. Refer to the following table for proper gas pipe diameters.
Strictly adhere to the correct pipe sizes.
PIPE LENGTH
(FEET) SCHEDULE 40 PIPE INSIDE DIA. TUBING, TYPE L OUTSIDE DIA.
NAT. L.P. NAT. L.P.
0-10 1/2" (1.3 cm) 3/8" (1.0 cm) 1/2" (1.3 cm) 3/8" (1.0 cm)
10-40 1/2" (1.3 cm) 1/2" (1.3 cm) 5/8" (1.6 cm) 1/2" (1.3 cm)
40-100 1/2" (1.3 cm) 1/2" (1.3 cm) 3/4" (2.0 cm) 1/2" (1.3 cm)
100-150 3/4" (2.0 cm) 1/2" (1.3 cm) 7/8" (2.3 cm) 5/8" (1.6 cm)
150-200 3/4" (2.0 cm) 1/2" (1.3 cm) 7/8" (2.3 cm) 3/4" (2.0 cm)
NOTE: Some areas allow coated stainless steel (CSST), copper tubing or galvanized pipe - check with local ap-
proval agencies and codes. NEVER use plastic pipe.
GAS PRESSURE CHECKING REQUIREMENTS
Inlet and manifold gas pressure checking taps are located on gas valve. A qualified installer shall take pressure meas-
urements at these ports to verify and set the correct gas pressures during initial installation.
NOTE: Check for gas leaks with soap and water solution.
Figure 10: Gas Supply
WARNING: Never use any type of pipe thread sealants or compounds
on the seats of flare or compression connections.
133
4"
57
8
"
FRONT

- 16 -
INLET
PRESSURE TAP
MANIFOLD PRESSURE
TAP
GAS PRESSURE REQUIREMENTS
ONE MAJOR CAUSE OF OPERATING PROBLEMS WITH GAS APPLIANCES CAN BE IMPROPER GAS
PRESSURE!
Problems such as changes in flame color or configuration, gas pilot or burner outages, intermittent operation, changes in
heat output, excessive burner noise, etc. are nearly always the result of changes in gas pressure or improper gas pres-
sure at the time of the installation. The most important item to check during the installation and the first thing to check
when problems occur is gas pressure!
Gas supplies normally enter a residence at 1/2 PSI (13" - 15" W.C.) (3 KPA). A pressure regulator is then placed outside
the residence, near the gas meter, which drops this pressure to 7" W.C. (1.8 KPA) (Nat. Gas). This "inches to inches"
regulator is of adequate capacity to service the gas appliances (such as dryer, furnace, etc.). If this regulator's capacity is
not sufficient to add the Gas Fireplace, an additional "inches to inches" regulator must be installed for the Fireplace.
EXCEPTION: Some codes allow 2-PSI (1.4KPA) supplies to enter the residence, in which case "pounds to inches" regu-
lators are used.
The following table provides information on correct gas pressure requirements. Be sure your gas supplier or plumber
carefully follows this table.
GAS PRESSURE REQUIREMENTS
DESIRED
INLET
PRESSURE
MINIMUM
INLET
PRESSURE
MAXIMUM
INLET
PRESSURE
MANIFOLD
OUTLET
PRESSURE
AIR SHUTTER
POSITION*
NATURAL GAS 7.0" W.C.
(1.75 kPa) 5.0" W.C.
(1.12 kPa) 11" W.C. (2.61 kPa) 3.5" W.C. (0.87 kPa) 0 - 1/8 " OPEN (3 mm)
L.P. GAS 11.0" W.C.
(2.75 kPa) 11" W.C.
(2.75 kPa) 13.0" W.C. (3.24 kPa) 10.0" W.C. (2.5 kPa) 1/4" OPEN MIN. (5 mm)
TURN GAS VALVE HI-LO KNOB TO "HIGH" POSITION. GAS PRESSURES MAY VARY PLUS OR MINUS 5%.
*NOTE: For high altitude (above 2.000 feet) some variations in air shutter settings may be required.
Manifold pressure must be taken at the “MANIFOLD PRESSURE" tap and inlet pressure at the "INLET PRESSURE" tap
with the burner operating by a qualified installer.
Figure 11: Pressure Test Port

- 17 -
GENERAL INSTALLATION INSTRUCTIONS
CAUTION: Each installation must conform to all local, state and national codes. Refer to the national fuel gas code and local zoning
and code authorities for details on installation requirements. The Mendota Fireplace must be vented to the outside in accordance with
the latest edition of the National Fuel Gas Code. In the absence of local codes, the installation must conform to the most current edi-
tion of the National Fuel Gas Code ANSI Z223.1, also known as NFPA 54. NOTE: The Mendota M-27 Fireplace is approved for mo-
bile home and bedroom installations.
CAUTION: The Mendota M-27 Fireplace may be installed in a manufactured (mobile) home after the first sale of the home. Manu-
factured home (mobile home) installation must conform with the Manufactured Home Construction and Safety Standard, Title 24
CFR, Part 3280, or, when such a standard is not applicable, the Standard for Manufactured Home Installations, ANSI A225.1/NFPA
501A, or CSA Z240.4-Gas Equipped Mobile Housing. Consult your local building official. Note: For mobile home installations unit
must be bolted to the floor and properly grounded.
1. After selection of the desired fireplace location, prepare the rough opening using framing dimensions on page 10.
Be sure to also prepare opening to allow for co-axial vent).
2. Check to make certain all venting requirements and locations are being followed.
3. This Fireplace is designed for installation into rough framing. NOTE: FRAMING MATERIAL ABOVE FIREPLACE
MUST MAINTAIN CORRECT CLEARANCE TO FIREPLACE AND VENT PIPES.
WARNING: One-inch clearance to sides & below and 2 inches clearance on top of horizontal sections and el-
bows.
4. NOTE: A removable panel in the enclosure for future visual inspection of flue connection is recommended.
5. Have an electrician install a 115-Volt supply to the junction box on lower right side of the fireplace cabinet. Connect
wires using wire nuts. Make sure the grounding wires are properly connected and that the installation conforms to
all local and national wiring codes.
6. Have gas supplier or qualified plumber install gas supply line to fireplace and
connect to the ½” female connector. Be sure gas and plumbing instructions
(see Page 15 and 16) and all local and national codes are carefully followed.
IMPORTANT: Any safety screen, guard, glass, grill etc. re-
moved for servicing this fireplace must be replaced prior to op-
erating this fireplace.
BLOWER OPERATION
The blower output can be regulated with the rheostat (included).
NOTE: There will be a time delay in blower operation during
"heat-up" (approx. ½ hour) and extended blower operation dur-
ing "cool-down" of unit (approx. ½ hour).
OPERATION DURING POWER OUTAGES
The fireplace is designed to operate during power outages. The
blower will not operate during the power outage.
The M-27 Fireplace must be installed by a qualified service person.
Figure 12: Junction Box

- 18 -
GENERAL FLUE VENTING INSTRUCTIONS
The Mendota Fireplace must be vented using the Mendota approved vent system components. Approved brands of vent
components include DuraVent, Amerivent, Selkirk and Security vent pipes and venting components. All warranties will be
voided and serious fire, health or other safety hazards may result from any of the following actions: Installation by unau-
thorized personnel; installation of any damaged component; unauthorized modification of vent system; installation of any
components not approved by Mendota; failure to meet all clearance requirements; failure to properly twist-lock and posi-
tively seal all components. Consult local building codes before beginning the installation.
WARNING
Always maintain required clearances (air spaces) to combustibles to prevent a fire hazard. Do not fill air spaces with in-
sulation. Check installation instructions for minimum clearance requirements between the outer walls of the vent pipe and
nearby combustible surfaces. Be sure to check the vent termination clearance requirements from decks, windows, soffit,
gas regulators, air supply inlets, and public walkways, as specified in these installation instructions and local building
codes.
SAFETY PRECAUTIONS FOR THE INSTALLER: 1) Wear gloves and safety glasses for protection; 2) Exercise extreme
caution when using ladders or on rooftops; and 3) Be aware of electrical wiring locations in walls and ceilings.
This gas appliance and vent system must be vented directly to the outside of the building, and never attached to a chim-
ney serving another solid fuel or gas burning appliance. Each direct vent gas appliance must have its own separate vent
system. Common vent systems are prohibited.
To assure proper venting performance of this high-performance Mendota Direct Vent Fireplace, it is critical that all brands
of vent pipe sections are sealed tightly and leak-proof. This means that all pipe sections must be carefully rotated into the
fully "twist-locked" position.
We strongly recommend that fixed length pipe sections be used in place of telescoping sections whenever pos-
sible.
Note: When using vent pipe and components that do not incorporate a fiberglass or graphite gasket at the inner exhaust
tube joints, you must use Milpak 1000F silicate stove sealant (#65-06-00909). Aluminum foil tape may be used on the
outer (air intake) pipe joint but is not mandatory. Local Codes may vary. Contact your dealer for proper materials.
Do not separate telescoping sections. They must be used as complete assemblies.
COMPONENT "TWIST-LOCK" CONNECTION PROCEDURE
DuraVent and American Metals pipe and fittings are designed with special
twist-lock connections. Twist-lock procedure is as follows: four (4) indenta-
tions, located on the female ends of pipes and fittings are designed to slide
straight in to the male ends of the adjacent pipes and fittings, by orienting the
four pipe indentations so that they match and slide into the four entry slots on
the male ends.
Push the pipe sections completely together then twist-lock one section clock-
wise, approximately ¼ turn until the two sections are fully locked. The female
locking lugs will not be visible from the outside on the black pipe or fittings.
They may be located by examining inside of the female ends.
Figure 13: Twist-Lock Piping
HIGH ALTITUDE INSTALLATION INFORMATION: Prior to installing at
altitudes higher than 7500, please contact the Mendota technical service
department for specific venting requirements and venting restrictions.

- 19 -
EXTERIOR VENT LOCATIONS AND RESTRICTIONS
ALL MEASUREMENTS FROM CENTER LINE OF VENT CAP
- Vent Terminal - Air Supply Inlet - Area where terminal is not permitted
A = Clearance above grade, veranda, porch, deck, or balco-
ny (*12 inches (30 cm) minimum). Vinyl surfaces re-
quire 24” min.
H = *Not to be installed above a meter/regulator assembly
within 3 feet (90 cm) horizontally from the center-line of
the regulator
B = Clearance to window or door that may be opened
(*12 inches (30 cm) minimum. I = *Clearance to service regulator vent outlet *3 feet (92 cm)
minimum.
C = *Clearance to permanently closed window (minimum
12 inches (30 cm) recommended to prevent condensa-
tion on window)
J = *Clearance to non-mechanical air supply inlet to building
or the combustion air inlet to any other appliance.
12 inches (30 cm) minimum.
D = *Vertical clearance to ventilated or soffit located above
the terminal from the center-line of the terminal (18
inches ( cm) minimum) Vinyl surfaces require 24” min
(60 cm).
K = *Clearance to a mechanical air supply inlet 6 feet (1.8 m)
minimum
E = *Clearance to unventilated soffit (18 inches (46 cm)
minimum) Vinyl surfaces require 24” min (60 cm) L = † Clearance above paved side-walk or a paved driveway located on public property (*7 feet (2.1 m) minimum)
F = Clearance to outside corner - 7 inches (18 cm). M = Clearance under veranda, porch, deck, or balcony (*12
inches (30 cm) minimum ‡)
G = Clearance to inside corner - 12 inches (30 cm). Vinyl
surfaces require 24” min (60 cm). N= Minimum 24” horizontal clearance to any surface, such as
an exterior surface, for vertical terminations.
† A vent shall not terminate directly above a sidewalk or paved driveway, which is located between two single-family
dwellings and serves both dwellings.
‡ Only permitted if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
* As specified in CGA B1:19 Installation Codes (1991). Note: Local codes or regulations may require different clearances.
Figure 14: Exterior Vent

- 20 -
FLUE VENTING COMPONENTS IDENTIFICATION
Figure 15: Flue Venting Components
ITEM DESCRIPTION
1 6" or 7” PIPE (DuraVent 6”/Amerivent 7”)
2 12" VENT STACK
3 24" VENT STACK
4 36" VENT STACK
5 48" VENT STACK
6 90ºGALVANIZED ELBOW
45ºGALVANIZED ELBOW
7 ADJUSTABLE WALL THIMBLE
8 ATTIC INSULATION SHIELD 12"
9 ROOF FLASHING (0/12 TO 6/12)
10 ROOF FLASHING (7/12 TO 12/12)
11 STORM COLLAR
12 VERTICAL VENT CAP
13 SUPPORT BAND
14 HORIZONTAL VENT CAP
15 FIRE STOP SPACER
DO NOT SEPARATE TELESCOPING SECTIONS.
USE TELESCOPING SECTIONS AS COMPLETE ASSEMBLIES.
12
11
10
9
15
13
1,2,3,4,5
14
7
6
1
HIGH ALTITUDE INSTALLATION INFORMATION: Prior to installing at altitudes higher than 7500, please con-
tact the Mendota technical service department for specific venting requirements and venting restrictions.