Haier GE NF96DV Installation Instructions Manual Download Page 51

Page: 51 / 51

507962-01G / 31-5000654

Page 51 of 51

Issue 2149

Requirements for Commonwealth of Massachusetts

Modifications to NFPA-54, Chapter 10

Revise NFPA-54 section 10.8.3 to add the following

requirements:

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, including those

owned or operated by the Commonwealth and where the

side wall exhaust vent termination is less than seven (7)

feet above the finished grade in the area of the venting,

including but not limited to decks and porches, the following

requirements shall be satisfied:

INSTALLATION OF CARBON MONOXIDE

DETECTORS

. At the time of installation of the side

wall, horizontally vented, gas-fueled equipment, the

installing plumber or gas fitter shall observe that a

hard-wired carbon monoxide detector with an alarm

and battery backup is installed on the floor level where

the gas equipment is to be installed. In addition, the

installing plumber or gas fitter shall observe that a

battery-operated or hard-wired carbon monoxide

detector with an alarm is installed on each additional

level of the dwelling, building or structure served by the

side wall, horizontally vented, gas-fueled equipment.

It shall be the responsibility of the property owner to

secure the services of qualified licensed professionals

for the installation of hard-wired carbon monoxide

detectors.

a. In the event that the side wall, horizontally vented,

gas-fueled equipment is installed in a crawl space

or an attic, the hard-wired carbon monoxide

detector with alarm and battery backup may be

installed on the next adjacent floor level.

b. In the event that the requirements of this subdivision

cannot be met at the time of completion of

installation, the owner shall have a period of thirty

(30) days to comply with the above requirements;

provided, however, that during said thirty (30)

day period, a battery-operated carbon monoxide

detector with an alarm shall be installed.

APPROVED CARBON MONOXIDE DETECTORS.

Each carbon monoxide detector as required in

accordance with the above provisions shall comply

with NFPA 720 and be ANSI/UL 2034 listed and IAS

certified.

SIGNAGE

. A metal or plastic identification plate shall

be permanently mounted to the exterior of the building

at a minimum 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.

”

INSPECTION

. The state or local gas inspector of the

side wall, horizontally vented, gas-fueled equipment

shall not approve the installation unless, upon

inspection, the inspector observes carbon monoxide

detectors and signage installed in accordance with the

provisions of 248 CMR 5.08(2)(a) 1 through 4.

EXEMPTIONS: The following equipment is exempt

from 24 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

separate from the dwelling, building or structure used

in whole or in part for residential purposes.

MANUFACTURER REQUIREMENTS - GAS EQUIPMENT

VENTING SYSTEM PROVIDED.

When the manufacturer of Product Approved side wall,

horizontally vented, gas-fueled equipment provides a

venting system design or venting system components

with the equipment, the instructions provided by the

manufacturer for installation of the equipment and the

venting system shall include:

1. Detailed instructions for the installation of the venting

system design or the venting system components: and

2. A complete parts list for the venting system design or

venting system.

MANUFACTURER REQUIREMENTS - GAS EQUIPMENT

VENTING SYSTEM NOT PROVIDED.

When the manufacturer of Product Approved sidewall,

horizontally vented, gas-fueled equipment does not

provide the parts for venting the flue gases, but identifies

“special venting systems,” the following requirements shall

be satisfied by the manufacturer:

1. The referenced “special venting system” instructions

shall be included with the appliance or equipment

installation instructions; and

2. The “special venting systems” shall be Product

Approved by the Board, and the instructions for that

system shall include a parts list and detailed installation

instructions.

A copy of all installation instructions for all Product

Approved side wall, horizontally vented, gas-fueled

equipment, 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.

Summary of Contents for GE NF96DV

Page 1: ...equivalent service agency or the gas supplier WARNING As with any mechanical equipment personal injury can result from contact with sharp sheet metal edges Be careful when you handle this equipment CAUTION Table of Contents Unit Dimensions 2 Parts Arrangement 3 Gas Furnace 4 Shipping and Packing List 4 Safety Information 4 General 6 Combustion Dilution Ventilation Air 7 Installation 10 Filters 12 ...

Page 2: ... Side 33 838 3 4 19 B Supply Air Supply Air 9 16 14 9 16 14 9 16 14 9 16 14 19 7 16 494 3 4 19 CONDENSATE TRAP CONNECTION 5 127 6 7 16 163 Either Side 9 229 Either Side 2 1 4 57 Either Side 1 25 Front Panel Flue Condensate Trap Assembly Furnished for external field installation on either side of unit See installation instructions for additional information 7 178 Unit Dimensions Capacity A B C in m...

Page 3: ...507962 01G 31 5000654 Page 3 of 51 Issue 2149 Parts Arrangement Figure 1 Access Panel Combustion Air Inducer Burner Box Assembly Gas Valve Control Box Blower Assembly ...

Page 4: ...If you find any damage immediately contact the last carrier Please refer to specification sheets for available accessories Safety Information DANGER OF EXPLOSION There are circumstances in which odorant used with LP propane gas can lose its scent In case of a leak LP propane gas will settle close to the floor and may be difficult to smell An LP propane leak detector should be installed in all LP a...

Page 5: ...the furnace If the damper is manually operated it must be equipped to prevent operation of either the heating or the cooling unit unless it is in the full HEAT or COOL setting When installed this furnace must be electrically grounded according to local codes In addition in the United States installation must conform with the current National Electric Code ANSI NFPA No 70 The National Electric Code...

Page 6: ...NSTALLER IS RESPONSIBLE FOR CONFIRMING THAT THE USE OF CONSTRUCTION HEAT IS CONSISTENT WITH THE POLICIES AND CODES OF ALL REGULATING ENTITIES ALL SUCH POLICIES AND CODES MUST BE ADHERED TO General These instructions are intended as a general guide and do not supersede local codes in any way Consult authorities having jurisdiction before installation In addition to the requirements outlined previou...

Page 7: ...PA 54 This reprinted material is not the complete and official position of ANSI on the referenced subject which is represented only by the standard in its entirely In Canada refer to the CSA B149 Installation codes Do not install the furnace in a corrosive or contaminated atmosphere Meet all combustion and ventilation air requirements as well as all local codes CAUTION All gas fired appliances req...

Page 8: ... 305 mm of the top of the enclosure and one within 12 305 mm of the bottom These openings must communicate directly or by ducts with the outdoors or spaces crawl or attic that freely communicate with the outdoors or indirectly through vertical ducts Each opening shall have a minimum free area of 1 square inch per 4 000 Btu 645 mm per 59 kW per hour of the total input rating of all equipment in the...

Page 9: ...erminated Exhaust Pipe Furnace Intake Debris Screen Provided See Maximum Vent Lengths table NOTE The inlet and outlet air openings shall each have a free area of at least one square inch per 4 000 Btu 645mm2 per 1 17kW per hour of the total input rating of all equipment in the enclosure Figure 9 Equipment in Confined Space Inlet Air from Ventilated Attic and Outlet Air to Outside Roof Terminated E...

Page 10: ...he unit nameplate Minimum clearances for closet or alcove installations are shown in Figure 14 Figure 11 Units with 1 2 HP Blower Motor Blower access panel must be securely in place when blower and burners are operating Gas fumes which could contain carbon monoxide can be drawn into living space resulting in personal injury or death WARNING Figure 12 Setting Equipment Figure 13 Improper installati...

Page 11: ...e plenum into the opening 3 Set the unit over the plenum and seal the plenum to the unit 4 Ensure that the seal is adequate Table 1 Non Combustible Floor Opening Size Cabinet Width Front to Rear Side to Side in mm in mm B cabinet 17 5 19 3 4 502 16 5 8 422 C cabinet 21 20 1 8 511 NOTE Floor opening dimensions listed are 1 4 in 6 mm larger than the unit opening See dimension drawing on Page 2 Figur...

Page 12: ... fiberglass strips on the combustible flooring base to make sure they are properly glued and positioned 4 Lower supply air plenum into the combustible flooring base until plenum flanges seal against fiberglass strips NOTE Be careful not to damage fiberglass strips Check for a tight seal 5 Set the furnace over the plenum 6 Ensure that the seal between the furnace and plenum is adequate Installation...

Page 13: ...ct of cement with skin and eyes CAUTION The exhaust and intake connections are made of PVC Use PVC primer and solvent cement when using PVC vent pipe When using ABS vent pipe use transitional solvent cement to make connections to the PVC fitting in the unit IMPORTANT Table 4 Piping and Fittings Specifications Schedule 40 PVC Pipe D1785 Schedule 40 PVC Cellular Core Pipe F891 Schedule 40 PVC Fittin...

Page 14: ...g socket 6 Promptly apply solvent cement to end of pipe and inside socket surface of fitting Cement should be applied lightly but uniformly to inside of socket Take care to keep excess cement out of socket Apply second coat to end of pipe NOTE Time is critical at this stage Do Not allow primer to dry before applying cement Capacity VENT PIPE DIA in STANDARD CONCENTRIC Outdoor Exhaust Accelerator D...

Page 15: ... poisoning or death The following steps shall be followed for each appliance connected to the venting system being placed into operation while all other appliances connected to the venting system are not in operation WARNING 1 Seal any unused openings in the common venting system 2 Inspect the venting system for proper size and horizontal pitch Determine that there is no blockage restriction leaka...

Page 16: ...ect Vent or a Direct Vent gas central furnace NOTE In non Direct Vent installations combustion air is taken from indoors and flue gases are discharged outdoors In Direct Vent installations combustion air is taken from outdoors and flue gases are discharged outdoors Intake and exhaust pipe sizing Size pipe according to Table 6 and Table 7A through Table 7C Table 6 lists the minimum vent pipe length...

Page 17: ...ectly size vent pipe diameter Figure 22 070 090 110 Standard or Concentric See Table 5 Intake or Exhaust 1 1 2 2 2 1 2 or 3 Furnace capacity 1 Which termination 2 Which needs most elbows 3 How many 4 Desired pipe size 5 What is the altitude 6 Use Table 7 to find max pipe length 7 ...

Page 18: ...3 8 16 65 43 8 87 68 68 9 11 60 38 n a 82 63 63 10 6 55 33 77 58 58 Standard Termination at Elevation 4 501 10 000 ft Number of 90 Elbows Used 1 1 2 Pipe 2 Pipe 2 1 2 Pipe 3 Pipe Capacity Capacity Capacity Capacity 070 090 110 070 090 110 070 090 110 070 090 110 1 15 n a n a 51 29 n a 100 78 43 122 103 103 2 10 46 24 95 73 38 117 98 98 3 n a 41 19 90 68 33 112 93 93 4 36 14 85 63 28 107 88 88 5 31...

Page 19: ...6 69 69 8 n a 55 39 n a 71 64 64 9 50 34 66 59 59 10 45 29 61 54 54 Concentric Termination at Elevation 4 501 10 000 ft Number of 90 Elbows Used 1 1 2 Pipe 2 Pipe 2 1 2 Pipe 3 Pipe Capacity Capacity Capacity Capacity 070 090 110 070 090 110 070 090 110 070 090 110 1 n a n a n a 43 27 n a 90 74 39 106 99 99 2 38 22 85 69 34 101 94 94 3 33 17 80 64 29 96 89 89 4 28 12 75 59 24 91 84 84 5 23 7 70 54 ...

Page 20: ... pipe must be the same diameter Maximum Allowable Exhaust Vent Length Using Ventilated Attic or Crawl Space for Intake Air in Feet Standard Termination at Elevation 0 10 000 ft Number of 90 Elbows Used 1 1 2 Pipe 2 Pipe 2 1 2 Pipe 3 Pipe Capacity Capacity Capacity Capacity 070 090 110 070 090 110 070 090 110 070 090 110 1 n a n a n a 41 24 n a 85 63 28 102 83 83 2 36 19 80 58 23 97 78 78 3 31 14 7...

Page 21: ...tions given in general guide lines for piping terminations and intake and exhaust piping terminations for direct vent sections Refer to Table 7A through Table 7C for pipe sizes Use the following steps when installing the unit in Non Direct Vent applications where combustion air is taken from indoors and flue gases are discharged outdoors 1 Use field provided materials and the factory provided air ...

Page 22: ...n Figure 28 or Figure 29 In addition position termination so it is free from any obstructions and 12 above the average snow accumulation At vent termination care must be taken to maintain protective coatings over building materials prolonged exposure to exhaust condensate can destroy protective coatings It is recommended that the exhaust outlet not be located within 6 feet 1 8 m of a condensing un...

Page 23: ...8 to 29 1 1 2 in 13 N A N A N A N A N A 2 in 12 10 19 16 18 15 2 1 2 in 7 N A 13 N A 12 N A 3 in N A N A 8 8 7 7 1 Refer to 99 Minimum Design Temperature table provided in the current edition of the ASHRAE Fundamentals Handbook 2 Poly Propylene vent pipe PP by Duravent and Centrotherm 3 Vent length in table is equivalent length Each elbow is equivalent to 5ft of straight pipe and should be include...

Page 24: ...ance ply inlet Clearance above paved sidewalk or paved driveway located on public property Clearance under veranda porch deck or balcony 12 Equal to or greater than soffit depth 3 feet 9m 12 3 feet 9m within a height 15 feet 4 5m above the meter regulator assembly 3 feet 9m 6 inches 152mm for appliances 10 000 Btuh 3kw 12 inches 305mm for appliances 10 000 Btuh 3kw and 100 000 Btuh 30kw 36 inches ...

Page 25: ...feet 9m within a height 15 feet 4 5m above the meter regulator assembly 3 feet 9m 6 inches 152mm for appliances 10 000 pliances 10 000 Btuh 3kw and 50 000 pliances 50 000 Btuh 15kw 6 inches 152mm for appliances 10 000 Btuh 3kw 12 inches 305mm for appliances 10 000 Btuh 3kw and 100 000 Btuh 30kw 36 inches 9m for appliances 100 000 Btuh 30kw 3 feet 9m above if within 10 feet 3m horizontally 6 feet 1...

Page 26: ...ng should terminate straight down using two 90 elbows see Figure 30 4 Exhaust piping must terminate straight out or up as shown A reducer may be required on the exhaust piping at the point where it exits the structure to improve the velocity of exhaust away from the intake piping See Table 9 Table 9 Exhaust Pipe Termination Size Reduction Capacity Exhaust Pipe Size Termination Pipe Size 070 2 51 m...

Page 27: ...nd intake piping must be run up an outside wall the exhaust piping must be terminated with pipe sized per Table 9 The intake piping may be equipped with a 90 elbow turndown Using turndown will add 5 feet 1 5 m to the equivalent length of the pipe 8 Based on the recommendation of the manufacturer a multiple furnace installation may use a group of up to four terminations assembled together horizonta...

Page 28: ...average snow accumulation B Horizontal separation between intake and exhaust C Minimum from end of exhaust to inlet of intake D Exhaust pipe length E Wall support distance from top of each pipe intake exhaust 12 305 mm Min 12 305 mm Min 6 152 mm Min 24 610 mm Max 9 227 mm Min 12 305 mm Min 16 405 mm Max 6 152 mm Max 6 152 mm Min 24 610 mm Max 9 227 mm Min 12 305 mm Min 20 508 mm Max 6 152 mm Max D...

Page 29: ...CCUMULATION SIZE PER EXHAUST PIPE TERMINATION SIZE REDUCTION TABLE Figure 40 Non Direct Vent Field Supplied Wall Termination SIZE TERMINATION PER EXHAUST PIPE TERMINATION SIZE REDUCTION TABLE FIELD PROVIDED REDUCER MAY BE REQUIRED TO ADAPT DIFFERENT VENT PIPE SIZE TO TERMINATION Figure 41 Non Direct Vent Field Supplied Wall Termination Extended SIZE TERMINATION PER EXHAUST PIPE TERMINATION SIZE RE...

Page 30: ...nward slope from the furnace to the drain Do Not use copper tubing or existing copper condensate lines for drain line CAUTION Figure 43 Condensate Trap and Plug Locations Plug same on left side Trap same on right side 1 1 2 in NOTE Vinyl tubing may be used for condensate drain Tubing must be 1 1 4 OD x 1 ID and should be attached to the drain on the trap using a hose clamp 5 Figure 45 shows the fu...

Page 31: ... be vented to relieve pressure in order for the furnace pressure switch to operate properly CAUTION Field Provided Vent 1 min 2 max above condensate drain Evaporator Drain Line vent required Condensate Drain Connection Figure 46 Evaporator Coil Using a Common Drain Figure 47 Condensate Trap with Optional Overflow Switch Field Provided Vent Upflow Furnace 1 Min to 2 Max Horizontal Furnace 4 Min to ...

Page 32: ...Not Furnished Drain Assembly for 3 4 inch Drain Pipe Condensate Drain Connection In Unit Condensate Drain Connection In Unit Vent To Drain Condensate Drain Connection In Unit Optional Condensate Drain Connection OptionalDrainPipingFromTrap DrainTrapAssembly Furnished DrainTrap Assembly with 1 2 inch Piping DrainTrap Assembly with 3 4 inch Piping 1 2 inch 3 4 inch 1 25 mm Min 2 50 mm Max Above Top ...

Page 33: ...for sediment or condensate 5 A 1 8 N P T plugged tap or pressure post is located on the gas valve to facilitate test gauge connection 6 In some localities codes may require installation of a manual main shut off valve and union furnished by installer external to the unit Union must be of the ground joint type Compounds used on threaded joints of gas piping must be resistant to the actions of liqui...

Page 34: ...125 3 54 118 3 34 110 3 11 103 2 92 1 25 4 1 049 26 645 680 19 25 465 13 17 375 10 62 320 9 06 285 8 07 260 7 36 240 6 80 220 6 23 205 5 80 195 5 52 1 1 4 31 75 1 380 35 052 1400 39 64 950 26 90 770 21 80 660 18 69 580 16 42 530 15 01 490 13 87 460 13 03 430 12 18 400 11 33 1 1 2 38 1 1 610 40 894 2100 59 46 460 41 34 1180 33 41 990 28 03 900 25 48 810 22 94 750 21 24 690 19 54 650 18 41 620 17 56...

Page 35: ...able 11 Capacity Maximum Over Current Protection Amps 070 15 090 110 20 4 Before connecting the thermostat check to make sure the wires will be long enough for servicing at a later date Make sure that thermostat wire is long enough to facilitate future removal of blower for service 5 Complete the wiring connections to the equipment Use the provided unit wiring diagram and the field wiring diagram ...

Page 36: ...wire shall conform with the temperature limitation for Type T wire 63 F 35 C rise Connect a sufficiently sized wire with ground to the furnace s line voltage connections and ground wire Refer to the furnace rating plate for electrical characteristics to be used in sizing field supply wiring and overcurrent protection The line voltage supply should be routed through a readily accessible disconnect ...

Page 37: ... there is a call for dehumidification Both the passive and active dehumidification methods described above can be utilized on the same furnace Circulating Airflow Adjustments Cooling Mode The units are factory set for the highest airflow for each model Adjustments can be made to the cooling airflow by repositioning the jumper plug marked COOL A B C D see Figure 54 To determine what CFM the motor i...

Page 38: ...l for fan closes the R to G circuit and the circulating blower motor runs at 50 of the selected cooling CFM until switched off When the call for fan is turned OFF the control de energizes the circulating blower Cooling The unit is set up at the factory for single stage cooling For two stage cooling operation clip the jumper wire located between the Y to Y2 terminals on the integrated ignition blow...

Page 39: ...ate the failure code The flash codes are presented in Table 12 Fault Code History Button The control stores the last five fault codes in memory A push button switch is located on the control When the push button switch is pressed and released the control flashes the stored fault codes The most recent fault code is flashed first the oldest fault code is flashed last To clear the fault code history ...

Page 40: ...507962 01G 31 5000654 Page 40 of 51 Issue 2149 Figure 55 Typical Field Wiring Diagram ...

Page 41: ...H WIRING MATERIAL HAVING A TEMP RATING OF AT LEAST 90 c 3 PROPER POLARITY MUST BE OBSERVED FOR FIELD LINE VOLTAGE SUPPLY IGNITION CONTROL WILL LOCK OUT IF POLARITY IS REVERSED 4 FOR TEMPORARY SERVICE REPLACEMENT OF CIRCULATING BLOWER MOTOR WITH PSC MOTOR CONNECT DESIRED SPEED TAP TO EAC TERMINAL AND NEUTRAL TAP TO NEUTRAL TERMINAL ON IGNITION CONTROL 5 DO NOT CONNECT C COMMON CONNECTION BETWEEN IN...

Page 42: ...system 2 Visually inspect the venting system for proper size and horizontal pitch Determine there is no blockage or restriction leakage corrosion or other deficiencies which could cause an unsafe condition 3 To the extent that it is practical close all building doors and windows and all doors between the space in which the appliances connected to the venting system are located and other spaces of ...

Page 43: ... units Priming Condensate Trap The condensate trap should be primed with water prior to start up to ensure proper condensate drainage Either pour 10 fl oz 300 ml of water into the trap or follow these steps to prime the trap 1 Follow the lighting instructions to place the unit into operation 2 Set the thermostat to initiate a heating demand 3 Allow the burners to fire for approximately 3 minutes 4...

Page 44: ...ct check gas orifices for proper size and restriction Remove temporary gas meter if installed NOTE To obtain accurate reading shut off all other gas appliances connected to meter Supply Pressure Measurement A pressure post on the inlet side of the gas valve provides access to the supply pressure Back out the 3 32 Hex screw one turn connect a piece of 5 16 tubing and connect a manometer to measure ...

Page 45: ...ration before allowing ignition trial The switches are factory set and must not be adjusted Temperature Rise After the furnace has been started and supply and return air temperatures have been allowed to stabilize check the temperature rise If necessary adjust the blower speed to maintain the temperature rise within the range shown on the unit nameplate See Table 18 for allowable heating speeds In...

Page 46: ...340 1575 1800 Normal 995 1230 1420 1650 880 1085 1290 1460 1st Stage 740 915 1055 1255 Normal 660 820 940 1120 575 735 850 995 Model Temp Rise Speed Adjustment Heating CFM 0 0 8 w c Setting D Setting C Setting B Setting A NF96D090V5C High Fire 35 65 1395 1555 1695 1825 Normal 1275 1395 1585 1670 1145 1265 1405 1525 Low Fire 25 55 1130 1230 1365 1475 Normal 1040 1130 1250 1340 910 1025 1130 1210 Co...

Page 47: ... 1275 1475 1680 1st Stage 920 1095 1265 1440 Normal 830 965 1130 1290 735 860 1035 1155 Allowable Heating Speeds Model Number Speed Adjust Setting D Setting C Setting B Setting A NF96D070V4B 10 Allowed Allowed Allowed Allowed Norm Allowed Allowed Factory Setting Allowed 10 Allowed Allowed Allowed Allowed NF96D090V5C 10 Allowed Allowed Allowed Allowed Norm Allowed Allowed Factory Setting Allowed 10...

Page 48: ...t access panel in place Motor Nameplate__________Actual__________ Winterizing and Condensate Trap Care 1 Turn off power to the furnace 2 Have a shallow pan ready to empty condensate water 3 Remove the clean out cap from the condensate trap and empty water Inspect the trap then reinstall the clean out cap Cleaning Heat Exchanger If cleaning the heat exchanger becomes necessary follow the below proc...

Page 49: ...re burners line up in center of burner ports 34 Reinstall gas valve manifold assembly Reconnect gas supply line to gas valve 35 Reconnect wires to gas valve 36 Replace the blower compartment access panel 37 Refer to instruction on verifying gas and electrical connections when re establishing supplies 38 Follow lighting instructions to light and operate furnace for 5 minutes to ensure that heat exc...

Page 50: ...Problems detected during the inspection may make it necessary to temporarily shut down the furnace until the items can be repaired or replaced Instruct the homeowners to pay attention to their furnace Situations can arise between annual furnace inspections that may result in unsafe operation For instance items innocently stored next to the furnace may obstruct the combustion air supply This could ...

Page 51: ...minimum 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 INSPECTION The state or local gas inspector of the side wall horizontally vented gas fueled equipment shall n...

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