Lenoxx G1D91BU User manual

506305-01 Page 1 of 36Issue 0938

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TABLE OF CONTENTS

SAFETY ...............................................................2

INSTALLATION ....................................................3

START-UP..........................................................26

OPERATION ......................................................27

MAINTENANCE .................................................30

REPAIR PARTS..................................................31

CONTROL SYSTEM DIAGNOSTICS.................32

WIRING DIAGRAMS..........................................33

INSTALLATION INSTRUCTIONS

G1D91BU, G1D91BT, G1D93BU, G1D93BT & G1D93BC

High Efficiency 90+ Condensing Gas Furnace

With System Sentry™ Control System

Manufactured By

Allied Air Enterprises Inc.

A Lennox International Inc. Company

215 Metropolitan Drive

West Columbia, SC 29170

*506305-01*

The installation of the furnace, wiring, warm air ducts, venting, etc. must conform to the requirements of the National Fire

Protection Association; the National Fuel Gas Code, ANSI Z223.1/NFPA No. 54 (latest edition) and the National Electrical

Code,ANSI/NFPANo.70(latestedition)intheUnitedStates;CSAB149.1(latestedition)NaturalGasandPropaneInstallation

Codes and the Canadian Electrical Code Part 1, CSA 22.1 (latest edition) in Canada; and any state or provincial laws, local

ordinances (including plumbing or wastewater codes), or local gas utility requirements. Local authorities having jurisdiction

shouldbeconsultedbeforeinstallationismade. Suchapplicableregulationsorrequirementstakeprecedenceoverthegeneral

instructions in this manual.

WARNING

This furnace is not approved for installation in a mobile

home. Do not install this furnace in a mobile home.

Installationinamobilehomecould result in actions that

couldcausepropertydamage,personalinjury,ordeath.

WARNING

Donotstorecombustiblematerials,includinggasolineand

otherflammablevaporsandliquids,nearthefurnace,vent

pipe, or warm air ducts. The homeowner should be

cautioned that the furnace area must not be used as a

broomclosetorforanyotherstoragepurposes. Suchuses

may result in actions that could cause property damage,

personalinjury, or death.

WARNING

Improperinstallation,adjustment,alteration,service,ormaintenancecan cause injuryorpropertydamage.

Refer to this manual. For assistance or additional information, consult a qualified installer, service

agency, or the gas supplier.

WARNING

506305-01Page 2 of 36 Issue 0938

The following is a list of safety rules and precautions that

must be followed when installing this furnace.

1. Useonlywiththetypeofgasapprovedforthisfurnace.

Refer to the furnace rating plate.

2. Install this furnace only in a location and position as

specified in the Location section on page 3 of these

instructions.

3. Provide adequate combustion and ventilation air to the

furnace space as specified in the Combustion and

VentilationAir section on page 4 of these instructions.

4. Adequateclearancemustbeprovided aroundthevent-

airintaketerminalsasspecifiedintheVenting section

beginning on page 5 of these instructions.

5. Combustion products must be discharged outdoors.

Connect this furnace to an approved vent system only,

asspecifiedintheVentingsectionbeginningonpage5

of these instructions.

6. Never test for gas leaks with an open flame. Use a

commerciallyavailablesoapsolutionmadespecifically

for the detection of leaks to check all connections, as

specified in Gas Supply and Piping beginning on

page 22 of these instructions.

IMPORTANT SAFETY INFORMATION

7. Always install 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 specified in Temperature Rise

on page 28 of these instructions. See furnace rating

plate.

8. When a 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 duct(s) sealed to the furnace

casing and terminating outside the space containing

the furnace. See CirculatingAir Supply on page 22

of these instructions.

9. A gas-fired furnace for installation in a residential

garagemustbe installedasspecified in the Location

section on page 3 of these instructions.

10. The furnace is permitted to be used for temporary

heatingofbuildingsorstructuresunderconstructionas

specified in the Location section beginning on page 3

of these instructions.

In the State of Massachusetts:

This product must be installed by a licensed Plumber

or Gas Fitter. When flexible connectors are used, the

maximum length shall not exceed 36". When lever-

type gas shutoffs are used, they shall be T-handle

type.

506305-01 Page 3 of 36Issue 0938

INSTALLATION

Theseinstructions must beplaced on ornear the furnacein

a conspicuous place.

The furnace design is certified by CSA International as a

Category IV furnace in compliance with the latest edition of

American National Standard Z21.47/CSA Standard 2.3 for

Gas-Fired Central Furnaces, for operation with natural gas

or propane. Consult the rating plate on the furnace for gas

type before installing.

The maximum hourly heat loss of space shall be calculated

in accordance with the procedure described in the current

manuals of Air Conditioning Contractors of America, or by

any other recognized method which is suitable for local

conditions, provided the results obtained are in substantial

agreementwith,and not lessthan, those obtainedusingthe

procedure described in the manuals.

G1D91BU and G1D93BU models shall be installed only as

upflow furnaces. G1D93BC models shall be installed only

as counterflow (downflow) furnaces.

G1D91BTandG1D93BTmodelsmaybeinstalledasupflow

orhorizontalright to leftorleftto rightairflowfurnaces. When

installed horizontally, the installer must install a sheet metal

screw to retain the upper door as shown in Figure 1.

Never install any furnace on its back.

To avoid property damage caused by condensate drain

blockage, install a field-fabricated auxiliary drain pan with a

separate drain line to the outside under the entire furnace

and drain system. Install according to local codes.

All models are suitable for closet or utility room installation.

Thefurnaceissuitableforinstallationinbuildings constructed

on-site. The furnace should be centralized in respect to the

heat distribution system as much as practicable. When

installedinautility room, the doorshould be wideenough to

allow the largest part of the furnace to enter, or permit the

replacement of another appliance, such as a water heater.

Agas-firedfurnace for installationinaresidential garage must

beinstalledsotheburner(s)andtheignitionsourcearelocated

not less than 18" above the floor. The furnace is to be located

or protected to avoid physical damage by vehicles.

Thisfurnaceisnotrecommendedtobeusedasaconstruction

heater during any phase of construction. Very low return air

temperatures, harmful vapors, and operation of the unit with

clogged or misplaced filters will damage the unit.

Thefurnacemaybe usedforheatingofbuildingsorstructures

under construction, if the following conditions are met:

• Theventsystemmustbepermanentlyinstalledperthese

installationinstructions.

• Aroom thermostat must control the furnace. The use of

fixedjumpers that will provide continuous heating is not

allowed.

• The return air duct must be provided and sealed to the

furnace.

Inspection of Shipment

This furnace is shipped in one package, completely

assembled and wired. The thermostat is shipped in a

separate carton when ordered.

Upon receipt of equipment, carefully inspect it for possible

shippingdamage. If damage is found,it should benoted on

the carrier’s freight bill. Damage claims should be filed with

thecarrier immediately. Claimsof shortagesshould be filed

with the seller within 5 days.

Location

Toprovideproperoperationandsatisfactoryperformance,care

must be taken in choosing the location for this furnace. The

atmosphere in which the furnace operates must be free of

contaminants such as chlorides and sulfates.

Thefurnace must be installedsothat electrical components

are protected from water. Unit must be level for proper

condensatedrainage.

The condensate drain on this furnace is incorporated

within the furnace and must be primed before start-up.

The condensate system must not be exposed to

temperatures under 32°F. Use of heat tape is

permissible provided the rate temperature of the tape

does not exceed 155°F.

WARNING

Horizontal Installations

Figure 1

HORIZONTAL RIGHT TO

LEFT AIRFLOW SHOWN

506305-01Page 4 of 36 Issue 0938

Unconfined Space

An unconfined space is defined as “a space whose volume

is more than 50 cubic feet per 1000 BTU per hour of the

combined input rating of all appliances installed in that

space.” Whenafurnaceisinstalled in an unconfined space

in a building, it can be assumed that the infiltration will be

sufficienttosupplythe required air. Ifthefurnaceisinstalled

in a ventilated attic or crawl space, it is assumed that the

infiltration is sufficient to supply the required air. However,

inabuildingofunusuallytightconstruction,additionaloutdoor

air should be provided.

• Return air temperature range between 60°F and 80°F

must be maintained.

• Air filters must be installed in the system and must be

maintained during construction.

• Air filters must be replaced upon construction completion.

• Theinput rate and temperature rise must be set per the

furnace rating plate.

• Onehundredpercent(100%)outdoorairmustbeprovided

for combustion air requirements during construction.

Temporary ducting may supply outdoor air to the furnace.

Do not connect duct directly to the furnace. Size the

temporary duct following the instructions provided on this

page in the Combustion and Ventilation Air section

regarding confined space with air from outside.

• The furnace heat exchanger, components, duct system,

airfilters,andevaporatorcoilsmustbethoroughlycleaned

following final construction cleanup.

• Allfurnaceoperatingconditions(includingignition,input

rate, temperature rise, and venting) must be verified

according to these installation instructions.

If the furnace is to be installed in an attic or other insulated

space,itmust be kept free and clear of insulating materials.

Clearances

All servicing and cleaning of the furnace can be performed

from the front. If installed in a closet or utility room, provide

18" clearance in front for service if the door to the room is

not in line with the front of the furnace.

Refer toTable1fortheminimumclearancesto combustibles

required for construction and proper unit operation.

Accessibility clearances must take precedence over fire

protection clearances.

G1D91BU,G1D91BT,G1D93BUandG1D93BTmodelsmay

be installed on wood flooring but shall not be installed directly

on carpeting, tile, or any other combustible material.

G1D93BC counterflow models are certified for installation

on combustible flooring provided a special base assembly

is used. (Refer to the Duct Connection – Counterflow

Models section on page 22 for more information on using

the special base assembly.)

When a counterflow unit is installed on a combustible floor,

1"clearancemust be provided betweenthesupply duct and

the floor.

Combustion and Ventilation Air

Adequate provisions for combustion air and ventilation of

furnace must be made. Refer to Section 5.3, “Air for

CombustionandVentilation,”oftheNationalFuelGasCode,

ANSI Z223.1/NFPA54 (latest edition), Sections 7.2, 7.3, or

7.4 of CSA B149.1 Natural Gas and Propane Installation

Codes (latest editions), or applicable provisions of the local

building codes.

Insufficient combustion air can cause headaches,

nausea,dizziness,orasphyxiation. Whenconsidering

combustionair requirements,enough air must alsobe

provided to meet the needs of all fuel-burning

appliances and exhaust fans.

WARNING

Air openings in the front of the furnace must be kept

free of obstructions. Any obstruction may cause

improper operation that can result in a fire hazard or

carbon monoxide injury.

WARNING

Table 1

Minimum Clearances to Combustibles

506305-01 Page 5 of 36Issue 0938

Confined Space

Aconfined space is defined as “a space whose volume is less

than 50 cubic feet per 1000 BTU per hour of the combined

input rating of all appliances installed in that space.”

If the furnace is installed in a confined space within the

building and combustion air is taken from a heated space,

the combustion air and ventilating air must enter and leave

the space through two permanent openings of equal area.

One opening shall be located within 12" of the ceiling and

the other within 12" of the floor, each having a free area of

1 square inch per 1000 BTU/HR of total input rating of all

appliances within the space and not less than 100 square

inches each.

If the furnace is installed in a space within a building of tight

construction, makeup air must be supplied from outdoors. In

this case, one opening shall be within 12" of the ceiling and

one opening within 12" of the floor. If combustion ducts are

vertical, each opening shall have a free area of 1 square inch

per 4000 BTU/HR of the total input rating of all appliances

withintheenclosure. Ifhorizontalcombustionductsarerun,1

square inch per 2000 BTU/HR is required.

Contaminated Combustion Air

Excessiveexposuretocontaminatedcombustionairwillresult

in safety and performance related problems. The

recommended source of combustion air is outdoor air.

However, the use of indoor air in most applications is

acceptable if the following guidelines are followed:

1. If the furnace is installed in a confined space, it is

recommended that the necessary combustion air come

fromtheoutdoorsbyway ofanattic,crawlspace,airduct,

or direct opening.

2. Ifindoorcombustionairisused,theremustbenoexposure

to the substances listed in item 5.

3. All provisions for indoor combustion air must meet the

requirementsforcombustion air indicated in theNational

Fuel Gas Code,ANSI Z223.1/NFPA54 (latest edition),

and/orany applicable local codes. In Canada, see CSA

B149.1, Natural Gas and Propane Installation Codes

(latest edition).

4. The following types of installation may require outdoor

air for combustion, due to chemical exposures:

• Commercial buildings

• Buildings with indoor pools

• Furnaces installed in laundry rooms

• Furnaces installed in hobby or craft rooms

• Furnaces installed near chemical storage areas

5. Exposure to the following substances in the combustion

air supply may 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

• Carbontetrachloride

• Halogen-typerefrigerants

• Cleaning solvents (such as perchloroethylene)

• Printing inks, paint removers, varnishes, etc.

• Cements and glues

• Antistatic fabric softeners for clothes dryers

• Masonry acid washing materials

• Chlorinated laundry products

• Hydrochloric acid

Venting

The high efficiency of this furnace is accomplished by the

removal of both sensible and latent heat from the flue gases.

The removal of latent heat results in the condensation of

moisture in the flue gases. This condensation occurs in the

secondaryheatexchanger andintheventsystem.Therefore,

this furnace requires special venting considerations and the

instructions must be followed to insure proper operation. All

venting must be in accordance with the codes having

jurisdiction in the area and these instructions.

G1D91BU,G1D91BT, G1D93BU, G1D93BTandG1D93BC

models can be installed as either direct vent or non-direct

vent units. Adirect vent (two pipe) installation requires that

alltheairnecessaryforcombustionbesuppliedfromoutside

the dwelling through an air intake pipe. A non-direct vent

(one pipe) installation uses air from inside the dwelling for

combustion.

The furnace is shipped with the air inlet pipe terminated to the

top panel for either inside or outside combustion air. An inlet

air restrictor plate (see Figure 2) is supplied with this furnace

andcanbefoundintheplasticbagcontainingtheseInstallation

Instructions and the User’s Information Manual. The inlet

restrictorplatemustbeusedinallinstallationsusinginside

air for combustion (non-direct vent).

Figure 2

Inlet Air Restrictor Plate

The inlet air restrictor plate must be

installed in all installations using inside

air for combustion (non-direct vent).

The flue pipe screen should be

installed at the termination of the flue

pipe in all installations.

Flue Pipe Screen

506305-01Page 6 of 36 Issue 0938

When a furnace is installed as direct vent, provisions for

ventilation air should follow the same requirements as if

installed as non-direct vent. Proper ventilation air is

necessary to maintain furnace component temperatures

within acceptable limits.

Allventspassingthroughfloors,ceilings, and walls must be

installed in accordance with National Fuel Gas Code,ANSI

Z223.1/NFPA54 (latest edition).

Thelengthof fluepipeexposedtooutdoorconditionsshould

be kept to a minimum. When the installation requires more

than 3 feet of flue pipe be exposed to outdoor conditions,

insulating the exposed flue pipe with 1/2” Armaflex or

equivalent is recommended. In climates with design

temperatures below zero degrees (F), 3/4” Armaflex or

equivalent is recommended.

Materials

All pipe, fittings, primer, and solvent cement must conform

withAmericanNationalStandard Institute and theAmerican

Society for Testing and Materials (ANSI/ASTM) standards.

The solvent shall be free flowing and contain no lumps,

undissolved particles, or any foreign matter that adversely

affects the joint strength or chemical resistance of the

The inlet restrictor plate must be installed in the air inlet in

one of three ways:

• Restrictor plate in inlet collar: Install the restrictor plate

in the inlet pipe collar in the top panel of the furnace.

Insert a 3" to 36" section of PVC pipe (field supplied)

into the collar. Use high temperature RTV sealant to

attach PVC pipe to collar. A90° elbow (field supplied)

may be attached to the PVC pipe, but the elbow is not

required. Use high temperature RTV sealant to attach

elbow to PVC pipe (if applicable).

• Restrictor plate in inlet pipe: Insert a 3" to 36" section of

PVC pipe (field supplied) into the collar. Use high

temperature RTV sealant to attach PVC pipe to collar.

Install the restrictor plate in the end of the inlet pipe just

installed. Attach either a field-supplied coupler or 90°

elbow to the end of the PVC pipe to keep the restrictor

plate in place. Use high temperature RTV sealant to

attach the coupler or elbow to PVC pipe.

• Restrictor plate in elbow: Insert a 3" to 36" section of

PVC pipe (field supplied) into the collar. Use high

temperature RTV sealant to attach PVC pipe to collar.

Attach a 90° elbow (field supplied) to the PVC pipe. Use

hightemperatureRTVsealanttoattachelbowtoPVCpipe.

Install the restrictor plate into the elbow.

Two different sized inlet restrictor plates are supplied with the

furnace (2" and 3"). Use the proper restrictor plate for the

furnace model.

If at any time in the future the installation of this furnace

is changed to require outside fresh air for combustion,

theinlet air restrictor plate must be removed. Failure to

remove the inlet air restrictor could cause improper

operation that can result in a fire hazard or carbon

monoxide injury.

WARNING

Also included in the plastic bag containing the inlet air

restriction plate is a flue pipe screen (see Figure 2). In all

installations,thisscreensouldbeinstalledat thetermination

of the flue pipe and is designed to keep objects out of the

flue pipe.

For either type of installation (direct or non-direct vent),

special venting considerations must be followed. Refer to

the proper section in pages 11 – 17 for the type of furnace

and venting being installed.

Theventingsystemmustbesupportedwithmountingstraps

to prevent any weight load from being applied to the vent

blower. Horizontal vent pipe must be supported every 5'

and vertical pipe should be supported every 10' to prevent

sagging and provide rigid support. Table 2

Piping and Fitting Specifications

Piping & Fitting

Material

ASTM

Specification

Schedule 40 PVC

(Pipe) D1785

Schedule 40 PVC

(Cellular Core Pipe) F891

Schedule 40 PVC

(Fittings) D2466

SDR-26 CPVC

(Pipe)

D2241

Schedule 40 ABS

(Pipe) D1527

Schedule 40 ABS

(Fittings) D2468

Schedule 40 & 80 CPVC

(Pipe) F441

ABS-DWV

Drain Waste & Vent

(Pipe & Fittings)

D2661

PVC-DWV

Drain Waste & Vent

(Pipe & Fittings)

D2665

F442

SDR-26

(Pipe)

Schedule 40 ABS

Cellular Core

DWV (Pipe)

F628

F438

Schedule 40 & 80 CPVC

(Fittings)

506305-01 Page 7 of 36Issue 0938

Preferredfittings are DWV styleor long sweep. Seal all joints

gas tight with appropriate cement. In areas where vent and

airintakepipesareexposedto abnormalstressoraresubject

to damage, schedule 80 pipe should be used.

Category IV Furnace Limitations

This furnace shall not be connected to any Type B, BW, or L

ventorventconnectorandshallnotbeconnectedtoanyportion

of a factory-built or masonry chimney. This furnace is not to

be common vented with any other appliance. The vent

pipe must not be connected to a chimney flue serving a

separate appliance designed to burn solid fuel.

Concentric Vent Kit

cement. The cement shall show no gelation, stratification,

or separation that cannot be removed by stirring.

Refer to Table 2 for approved piping and fitting materials.

Canadian Applications Only: PVC pipe, fittings, primer

and solvent cement used to vent this applicance must be

certifiedtoULCS636andsuppliedby a single manufacturer

as part of an approved venting system. In addition, the first

three feet of vent pipe from the furnace flue collar must be

accessibleforinspection. Models that may beinstalledasa

horizontal furnace include a horizontal drain kit. In Canada

this drain kit must be replaced by a locally available IPEX

Drain Kit # 196014. For Local IPEX Canadian Customer

Service Center and Kit abailability call IPEX at 1-866-473-

9462.

The primers and solvents used must also meet ASTM

specifications. PVCprimer is specified inASTMF656. Use

PVC solvent as specified inASTM D2564 andABS solvent

cementasspecifiedASTMD2235. Lowtemperaturesolvent

cement is recommended. Metal or plastic strapping may

be used for vent pipe hangers.

WhenmakingABSjoints,piecescanbepreparedwithaclean

dryclothtocleaninsidesocketsurfaceoffittingandmaleend

of pipe to depth of socket. Refer to procedure specified in

ASTM D3138. When joining ABS to PVC materials, use

transitionsolvent.

Figure 3

Concentric Vent Kit Dimensions

Aconcentric vent kit (seeAccessories section on page 31 for

correct kit) is available for use when installing this furnace as

adirectventfurnace andtheairintakeand ventpipearetobe

run through the same hole, whether horizontally through the

wall or vertically through the roof (see Figure 3). Refer to the

instructionsincludedwiththeconcentricventkitforinstallation

specifics.

Vent Pipe Size and Length

Theventpipe and air intakepipe(indirectvent installations)

should be sized in accordance with the information found in

theappropriatetableinFigure4. One90°elbow isequivalent

to 5' of pipe. Two 45° elbows are equivalent to one 90°

elbow. The minimum length certifiedforusewiththisfurnace

is 5' and one elbow, not including the vent and air intake

terminals.

In the event that the pipe length is in between the lengths

listed in the table, use the next larger length listed. For

example, if a length of pipe needed to install the furnace is

27', use the diameter values for the 30' row in the tables.

For direct vent installations, if the vent and air intake pipe

arenotequalin lengthandnumberofelbows,thendetermine

the minimum pipe diameter for both the vent and air intake.

If the results indicate different diameters, use the larger of

the two for both the vent and air intake. Under no

circumstances should the vent and air intake pipe size

be different in diameter. For installation details, refer to

the appropriate section in pages 11 – 17 for the unit model

and type of installation.

High Altitude Installation: 2” pipe not recommended at

altitudeabove4,000feet. 3”pipe required for altitude above

5,000 feet.

Horizontal Venting

The vent for this appliance shall not terminate over public

walkways; or near soffit vents or crawl space vents or other

areaswherecondensateorvaporcouldcreateanuisance or

hazardorcausepropertydamage;orwherecondensatevapor

couldcausedamageorcouldbedetrimentalto the operation

of regulators, relief valves, or other equipment.

See Figures 5 and 6 on pages 9 and 10 for additional

information on where the horizontal vent terminal can and

cannot terminate.

For Massachusetts Installations: The installation must

comply with Massachusetts 248 CMR 5.08 Modifications to

sections of NFPA-54, Chapter10. (See pages 35 and 36 )

506305-01Page 8 of 36 Issue 0938

Figure 4

Vent Tables *

(numbers in inches unless specified otherwise)

Minimum Pipe Diameter

45,000 – 75,000 BTU/HR Models

NR = Not Recommended

* 2” not recommended at altitude above 4,000 feet

3” required for altitude above 5,000 feet

Minimum Pipe Diameter

112,000 – 125,000 BTU/HR Models

Minimum Pipe Diameter

90,000 – 100,000 BTU/HR Models

0123456789

222222222

2222222

3333

33333

Vent Pipe

Length

(ft.)

Number of 90° Elbows

1.5 1.5

1.5

22222222

2.5

2222222

2.5 2.5 2.5

2.5 2.5 2.5 2.5 2.5

22 2 22

32.5 2.5 2.5 2.5 2.5 2.5 2.5

2.5

2.5 2.5 2.5 2.5 2.5

2.52.52.5

2.52.5

2.5

2.52.5

3333 3

NR NR

NR NR NR

0123456789

222

222 333

333333

3333

Vent Pipe

Length

(ft.)

Number of 90° Elbows

33 3

3 3 3

333

3 3 333

2.5

2.5 2.5 2.5

2.5 2.5 2.5 2.5

2.5 2.5 2.5

2.5

2.5 2.5

22222

NR NR NR

NR NR NR NR NR

NR NR

NRNR

NR NR NR NR NR NR NR

0123456789

Vent Pipe

Length

(ft.)

Number of 90° Elbows

2.5

NR NR NR NR NR NR NR NR

NRNR

NR NR NR

NR NR

2.5

2.5 2.5 2.5 2.5

2.5 2.5 2.5 2.5 2.5

2.5

2.52.52.5

2.5

2.5 2.5 2.5 2.5 2.5

2.52.5

2.52.52.5

2.5

2.52.5

506305-01 Page 9 of 36Issue 0938

Figure 5

Sidewall Vent Terminal Clearances (Direct Vented Furnaces)

1In accordance with the current CSA B149.1, Natural Gas and

Propane Installation Code

2In 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 dwellings and

serves both dwellings.

‡Permitted only if veranda, porch, deck, or balcony is fully open on a

minimum of two sides beneath the floor.

* For clearances not specified in ANSI Z223.1/NFPA 54 or CSA

B149.1, the following statement shall be included:

“Clearance in accordance with local installation codes and the

requirements of the gas supplier and the manufacturer’s installation

instructions.”

Vent Terminal

Air Supply Inlet

Area Where Terminal Is

Not Permitted

A ** Minimum 12” (30 cm) above grade or

12” (30 cm) above average snow accumulation.

506305-01Page 10 of 36 Issue 0938

Figure 6

Sidewall Vent Terminal Clearances (Non-Direct Vented Furnaces)

1In accordance with the current CSA B149.1, Natural Gas and

Propane Installation Code

2In 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 dwellings and

serves both dwellings.

‡Permitted only if veranda, porch, deck, or balcony is fully open on a

minimum of two sides beneath the floor.

* For clearances not specified in ANSI Z223.1/NFPA 54 or CSA

B149.1, the following statement shall be included:

“Clearance in accordance with local installation codes and the

requirements of the gas supplier and the manufacturer’s installation

instructions.”

A ** Minimum 12” (30 cm) above grade or

12” (30 cm) above average snow accumulation.

Vent Terminal

Air Supply Inlet

Area Where Terminal Is

Not Permitted

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