Table of Contents
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INSTALLATION INSTRUCTIONS
35" Tall, High Efficiency Condensing Gas Furnace
These instructions must be read and understood completely before attempting installation.
DANGER, WARNING, CAUTION, and NOTE
The
signal
words
CAUTION, and NOTE are used to identify levels of
hazard seriousness. The signal word DANGER is
only used on product labels to signify an immediate
hazard. The signal words WARNING, CAUTION,
and NOTE will be used on product labels and
throughout this manual and other manual that may
apply to the product.
DANGER − Immediate hazards which will result in
severe personal injury or death.
WARNING − Hazards or unsafe practices which
could result in severe personal injury or death.
CAUTION − Hazards or unsafe practices which
may result in minor personal injury or product or
property damage.
NOTE − Used to highlight suggestions which will
result in enhanced installation, reliability, or
operation.
TABLE OF CONTENTS
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Portions of the text and tables are reprinted from NFPA 54 /ANSI Z223.1−2012, with permission of National Fire Protection Association, Quincy, MA 02269 and American Gas Association, Washington, DC
20001. This reprinted material is not the complete and official position of the NFPA or ANSI, on the referenced subject, which is represented only by the standard in its entirety.
Printed in U.S.A.
Variable Speed Motor, Two−Stage
Safety Labeling and Signal Words
DANGER,
WARNING,
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(F/G)9MVE
Signal Words in Manuals
The signal word WARNING is used throughout
this manual in the following manner:
WARNING
!
The signal word CAUTION is used throughout
this manual in the following manner:
CAUTION
!
Signal Words on Product Labeling
Signal words are used in combination with
colors and/or pictures or product labels.
Safety−alert symbol
When you see this symbol on the unit and in
instructions or manuals, be alert to the
potential for personal injury.
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INSTALLER: Affix these instructions on or adjacent to the
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furnace.
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CONSUMER:
reference.
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Use of the AHRI Certified TM Mark indicates a
manufacturer's participation in the program.
For verification of certification for individual
products, go to www.ahridirectory.org .
Retain
these
instructions
440 01 4400 03
for
future
12/5/2013
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Table of Contents
Related Manuals for International comfort products F9MVE
Summary of Contents for International comfort products F9MVE
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Page 1: Table Of Contents
INSTALLATION INSTRUCTIONS Variable Speed Motor, Two−Stage 35” Tall, High Efficiency Condensing Gas Furnace (F/G)9MVE These instructions must be read and understood completely before attempting installation. Safety Labeling and Signal Words DANGER, WARNING, CAUTION, and NOTE Signal Words in Manuals signal words DANGER, WARNING,... - Page 2 Required Notice for Massachusetts Installations Important The Commonwealth of Massachusetts requires compliance with regulation 248 CMR as follows: 5.08: Modifications to NFPA−54, Chapter 10 2) Revise 10.8.3 by adding the following additional requirements: (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, including those owned or operated by the Commonwealth and where the side wall exhaust vent termination is less than seven (7) feet above 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.
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Page 3: Safety Considerations
INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE Safety Considerations changing residential construction practices. We require these instructions as a minimum for a safe installation. Follow all safety codes. Wear safety glasses, protective WARNING clothing, and work gloves. Have a fire extinguisher available. Read these instructions thoroughly and follow all warnings or cautions included in literature and attached to the unit. -
Page 4: Introduction
INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE accessory gas conversion kit is required to convert load estimates can be made using approved methods available furnace for use with propane gas. from Air Conditioning Contractors of America (Manual J); See Table 1 for required clearances to combustible American Society Heating,... -
Page 5: Electrostatic Discharge (Esd)
INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE Disconnect all power to the furnace. Multiple CANADA: NSCNGPIC. For a copy, contact Standard disconnects may be required. DO NOT TOUCH THE Sales, CSA International, 178 Rexdale Boulevard, Etobicoke (Toronto), Ontario, M9W 1R3, Canada. CONTROL OR ANY WIRE CONNECTED TO THE Combustion and Ventilation Air CONTROL PRIOR TO DISCHARGING YOUR BODY’S ELECTROSTATIC CHARGE TO GROUND. -
Page 6: Dimensions
INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE Figure 2 Dimensions SD5060−4 Rev F (F/G)9MVE SHIP WT. CABINET BOTTOM LB (KG) FURNACE SIZE OUTLET WIDTH AIR INTAKE WIDTH INLET WIDTH 0401410 14−3/16 (361) 12−1/2 (319) 12−9/16 (322) 7−1/8 (181) 121 (54) 0401712 17−1/2 (445) 15−7/8 (403) 16 (406) 8−3/4 (222) -
Page 7: Location
INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE Location be located close to the chimney or vent and attached to an air distribution system. Refer to Air Ducts section. CAUTION be provided ample space for servicing and cleaning. Always comply with minimum fire protection clearances shown in Table 1 or on the furnace clearance to combustible construction label. -
Page 8: Location Relative To Cooling Equipment
INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE Figure 3 Multipoise Orientations THE BLOWER IS LOCATED BELOW THE BURNER SECTION, AND CONDITIONED AIR IS DISCHARGED UPWARD. THE BLOWER IS LOCATED TO THE RIGHT OF THE BURNER SECTION, AND CONDITIONED AIR IS DISCHARGED TO THE LEFT. THE BLOWER IS THE BLOWER IS LOCATED TO THE LEFT... -
Page 9: Air For Combustion And Ventilation
INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE Air for Combustion and WARNING Ventilation CARBON MONOXIDE POISONING HAZARD Introduction Failure to follow this warning could result in personal Direct Vent (2−pipe) Applications injury or death. The operation of exhaust fans, kitchen ventilation fans, When the furnace is installed as a direct vent (2-pipe) furnace, clothes dryers, attic exhaust fans or fireplaces could no special provisions for air for combustion are required. - Page 10 INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE Indoor Combustion Air NFPA & AGA and 2. Determine the minimum required volume for each appliance in the space and add the volumes together to get the Standard and Known-Air-Infiltration Rate total minimum required volume for the space. Methods Table 4 −...
- Page 11 INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE Combination of Indoor and Outdoor Air Air for Combustion, Ventilation, Figure 7 and Dilution from Indoors Indoor openings shall comply with the Indoor Combustion Air Method below and, Outdoor openings shall be located as required in the Outdoor Combustion Air Method mentioned previously and, Outdoor openings shall be sized as follows:...
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Page 12: Condensate Trap
INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE Table 4 Minimum Space Volumes for 100% Combustion, Ventilation and Dilution Air from Outdoors OTHER THAN FAN‐ASSISTED TOTAL FAN‐ASSISTED TOTAL (1,000'S BTUH GAS INPUT RATE) (1,000'S BTUH GAS INPUT RATE) Space Volume Ft 1,050 1,400 1,750 1,400 1,500... - Page 13 INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE Figure 8 Upflow Trap Configuration Vent Pipe Clamp Condensate Trap Vent Elbow Clamp Relief Port Collector Box Plugs Vent Elbow Collector Box Plug Condensate Trap Relief Port Condensate Trap Pressure Switch Outlet Port UPFLOW TRAP CONFIGURATION 1 &...
- Page 14 INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE Downflow Trap Configuration Connect the new pressure switch tube from Loose Parts bag to Route tube through inducer port on front pressure switch. stand−offs to adjust position of the tube. Trim excess tube. Connect pressure switch tube to port on collector Install the two plugs box.
- Page 15 INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE Figure 10 Unconverted Factory Configuration as viewed in the Horizontal Right Orientation Remove plug from If alternate vent position collector box. is required, loosen clamp DO NOT DISCARD. on inlet of vent elbow. Remove the screw that secures the trap to the collector box and remove trap.
- Page 16 INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE Figure 11 Unconverted Factory Configuration as viewed in the Horizontal Left Orientation Remove the screw that secures the condensate trap to the collector box If alternate vent position and remove trap. is required, loosen clamp on vent elbow inlet.
- Page 17 INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE Condensate Drain Connection For Right Side Condensate Drain: 1. Remove the 7/8−in. knock−out from the right side of the CAUTION casing. (See Figure 13 for suggested knockout removal technique.) 2. Remove the pre−formed rubber drain elbow and two FROZEN AND BURST WATER PIPE HAZARD spring clamps from the loose parts bag.
- Page 18 INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE provided with the furnace. The “Z“ pipe is long enough to NOTICE extend across the casing for drain connections. 2. Locate the “Z” pipe. Remove the pre-formed drain elbow The field-supplied, accessory horizontal drain trap and four spring clamps from the loose parts bag.
- Page 19 INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE Figure 13 Knockout Removal Figure 15 Drain Trap Connection and Routing Attach elbow to condensate trap Cut formed end off condensate drain Formed end of elbow grommet Connect short end of “Z” pipe to modified drain elbow Factory supplied 1/2−in.
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Page 20: Installation
INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE supply−side accessories MUST be connected to duct external Figure 17 Horizontal Drain Trap Grommet to furnace main casing. Return Air Connections WARNING FIRE HAZARD A failure to follow this warning could cause personal injury, death and/or property damage. Never connect return−air ducts to the back of the Remove knockout. -
Page 21: Downflow Installation
INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE Figure 20 Leveling Legs Floor and Plenum Opening Figure 21 Dimensions A96283 NOTE: It is recommended that the perforated supply−air duct A89014 flanges be completely removed from furnace when installing the furnace on a factory−supplied cased coil or coil box. To NOTE: Bottom closure must be used when leveling legs are remove the supply−air duct flange, use wide duct pliers or hand used. -
Page 22: Horizontal Installation
INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE CAUTION Bottom Return Air Inlet These furnaces are shipped with bottom closure panel installed in bottom return−air opening. Remove and discard this panel MINOR PROPERTY HAZARD when bottom return air is used. To remove bottom closure Failure to follow this caution may result in minor panel, perform the following: property damage. - Page 23 INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE Table 5 Opening Dimensions − in. (mm) FURNACE PLENUM OPENING FLOOR OPENING CASING WIDTH APPLICATION IN. (mm) 12−11/1 Upflow Applications on Combustible or Noncombustible Flooring 21−5/8 13−5/16 22−1/4 (subbase not required) (549) (338) (565) (322) Downflow Applications on Noncombustible Flooring 12−9/16 13−3/16...
- Page 24 INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE Figure 25 Suspended Furnace Installation COMBUSTION − AIR PIPE (SEE VENTING SECTION) 2−in. (51 mm) A11155 NOTE: Local codes may require a drain pan and condensate trap when a condensing furnace is installed over a finished ceiling.
- Page 25 INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE Roll−Out Protection side and bottom of the furnace. (See Figure 28, Figure 31, and Figure 30) Provide a minimum 12−in. x 22−in. (305 x 559 mm) piece of For downflow applications, the filter rack (or field supplied sheet metal for flame roll−out protection in front of burner area accessory air cleaner) must only be connected to the bottom for furnaces closer than 12−in.
- Page 26 INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE Table 7 Filter Media Pressure Drop (Clean) Versus Airflow - in. w.c. (Pa) Representative After-Market Filter Media* Factory-Accy Fiberglass* Pleated* 14 x 25 Filter Washable (1-in. / 2.5 cm) (1-in. / 2.5 cm) (2-in. / 5 cm) (1-in.
- Page 27 INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE External Filter Cabinet Configurations Downflow Return Air Figure 27 Configurations and Restrictions Figure 30 Accessory Bottom Filter Rack L10F033 Upflow Return Air Configurations Figure 28 and Restrictions L10F031 22−5/16 (566.4) 28−7/16 (722.2) L10F032 Horizontal Return Air Figure 29 Configurations and Restrictions HORIZONTAL TOP...
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Page 28: Air Ducts
INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE Systems Design Guidelines reference tables available from Figure 31 Accessory Side Filter Rack your local distributor. The duct system should be sized to handle the required system design CFM at the design external static pressure. The furnace airflow rates are provided in the Service and Technical Support Manual. - Page 29 INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE WARNING Table 10 Maximum Capacity of Pipe NOMINAL LENGTH OF PIPE − FT (M) INTERNAL FIRE OR EXPLOSION HAZARD IRON PIPE DIA. SIZE Failure to follow this warning could result in personal IN. (MM) (3.0) (6.0) (9.1) (12.1)
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Page 30: Electrical Connections
INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE ELECTRICAL CONNECTIONS Redundant Automatic Gas Valve Figure 33 (Two−Stage) WARNING ON/OFF Switch Regulator Seal Cap ELECTRICAL SHOCK, FIRE EXPLOSION Regulator Adjustment HAZARD Regulator Seal Cap under Cap 1/2” NPT Inlet Failure to follow safety warnings could result in dangerous operation, serious injury, death or property damage. -
Page 31: J−Box Installation
INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE by this equipment. Refer to rating plate or Table 11 for equipment electrical specifications. U.S.A. Installations: Make all electrical connections in accordance with the current edition of the National Electrical Code (NEC) ANSI/NFPA 70 and any local codes or ordinances SWITCH that might apply. - Page 32 INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE Pull furnace power wires through 1/2-in. (12 mm) Figure 36 Optional J−Box Locations diameter hole in J−Box. If necessary, loosen power wires from strain−relief wire-tie on furnace wiring harness. Connect any code required external disconnect(s) to field power wiring.
- Page 33 INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE BX Cable Installation in Furnace J−Box male 1/4−in quick−connect terminals on the control board marked EAC−1 and EAC−2. The terminals are 1. Install J−Box mounting bracket to inside of furnace rated for 115VAC, 1.0 amps maximum and are casing.
- Page 34 INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE Figure 39 Isolation Relay for Humidifiers with Internal Power Supply To HUM 24 VAC Terminal To Humidifier Leads On Furnace Control Board 24 V Coil To Humidifier Leads To Com/24V Screw Terminal on Thermostat Strip A11157 Figure 40 Example of Variable Speed Furnace Control for ECM Blower Motor...
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Page 35: Venting
INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE VENTING ’apprêt et le ciment d’un manufacturier avec un système d’évacuation d’un manufacturier différent. NOTE: Planning for the venting system should be done in Bien suivre les indications du manufacturier lors de l’utilisation conjunction with planning for the ductwork, drainage, and de l’apprêt et du ciment et ne pas utiliser ceux-ci si la date furnace accessories, such as air cleaners and humidifiers. - Page 36 INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE General Venting Systems If this furnace replaces a furnace that was connected to a vent WARNING system or chimney, the vent or vent connectors of other remaining appliances may need to be re−sized. Vent systems or vent connectors of other appliances must be sized to the CARBON MONOXIDE POISONING HAZARD minimum size as determined using appropriate table found in...
- Page 37 INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE attenuation. To aid sound attenuation, point the inlet air pipe NOTICE away from occupants. An extra elbow and/or five feet (1.5 M) of pipe may be used to accomplish the sound attenuation OPTIONAL CONFIGURATION FOR COMBUSTION function.
- Page 38 INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE Table 13 Approved Combustion-Air and Vent Pipe, Fitting and Cement Materials (U.S.A. Installation) ASTM SPECIFICATION SOLVENT CEMENT AND MATERIAL PIPE FITTINGS DESCRIPTION (MARKED ON PRIMERS MATERIAL) Pipe − − Schedule−40 D1527 Pipe − − Schedule−40 D1785 For ABS −...
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Page 39: Direct Vent / 2−Pipe System
INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE WARNING Locating the Vent Termination General CARBON MONOXIDE POISONING HAZARD NOTE: Termination Requirements for the Provinces of Failure to follow the instructions outlined in Locating Alberta and Saskatchewan are located at the end of this the Vent Termination for each appliance being placed section. - Page 40 INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE or tee, certified to ULC S636 from the adjacent property line Figure 46 Vent Terminations must be used. (See Figure 44 and Figure 46) The concentric vent kit currently cannot be modified to attach an elbow to the vent portion of the rain cap. A tee attached to the rain cap could potentially direct the flue gas plume toward the intake air stream and contaminate the incoming combustion air for the furnace.
- Page 41 INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE Figure 47 Combustion Air and Vent Pipe Termination for Direct Vent (2−Pipe) System Roof Termination (Preferred) Note: 36−in. separation between pairs of inlets only required for direct−vent systems Note: Vertical separation between At least 36 in. “A”...
- Page 42 INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE Size the Vent and Combustion Air Pipes Optional Combustion Air Inlet General Moisture Trap As an option to prevent moisture from trickling into the furnace Approved 2−pipe vestibule, a trap can be installed in the intake air pipe near the termination fittings Vent or Combustion Air furnace.
- Page 43 INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE To calculate the Total Equivalent Vent Length (TEVL) of the pipe chosen, then that diameter of pipe selected may be used. venting system: 1. Measure the individual distance from the furnace to the b. If the Total Vent Length is longer than the Maximum termination for each pipe.
- Page 44 INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE moisture resistant insulation such as Armaflex or other Figure 51 Inducer Vent Elbow − PSC equivalent type of insulation. 5. Insulate combustion air inlet piping when run in warm, humid spaces. 6. Install the insulation per the insulation manufacturer’s installation instructions.
- Page 45 INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE Upflow Configurations (CONTINUED) Downflow Configurations (CONTINUED) DOWNFLOW RIGHT − VENT CONFIGURATION Representative drawing only, some models may vary in appearance. A11312 UPFLOW RIGHT − VENT CONFIGURATION Representative drawing only, some models may vary in appearance. A11308 UPFLOW VERTICAL −...
- Page 46 INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE Horizontal Left Configurations (CONTINUED) Horizontal Right Configurations (CONTINUED) HORIZONTAL LEFT − LEFT VENT CONFIGURATION Representative drawing only, some models may vary in appearance. HORIZONTAL RIGHT − LEFT VENT CONFIGURATION Representative drawing only, some models may vary in appearance. HORIZONTAL LEFT −...
- Page 47 INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE Installing the Vent Pipe Adapter and Install the remaining vent and combustion air pipes as shown below. It is recommended that all pipes be cut, prepared, and Combustion Air Pipe Adapter preassembled before permanently cementing any joint. WARNING 1.
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Page 48: Installing The Vent Termination
INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE Optional Installation of the Vent Pipe Figure 56 Combustion Air Pipe NOTE: THIS TECHNIQUE POLYPROPYLENE VENTING SYSTEMS. This option provides a disconnect point for the vent pipe. The vent pipe must be cemented to the plastic vent pipe adapter to maintain a sealed vestibule. - Page 49 INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE Disassemble loose pipe fittings. Clean and cement using same NOTICE procedures as used for system piping. DO NOT CEMENT POLYPROPYLENE FITTINGS. RECOMMENDED SUPPORT VENT Two−Pipe and Single−Pipe Terminations TERMINATIONS Single and two pipe vent must be installed as shown in It is recommended that side−wall vent terminations in Figure 47 and Figure 48.
- Page 50 INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE Figure 57 Crawl Space Vent Termination Ventilated Combustion Air intake pipe Pipe hangar 3” (76 mm) 12” (305 mm) Ventilated Combustion Air intake termination in crawl space CRAWL SPACE L11F016A Figure 58 Attic Vent Termination Ventilated Combustion Air intake pipe Vent through...
- Page 51 INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE Figure 59 Direct Vent Termination Clearance 25−24−65−2 NOTE: The following is based upon National codes for gas appliances, and is provided as a reference. Refer to Local codes which may supersede these standards and/or recommendations. (1 ) (2 ) Canadian Installations...
- Page 52 INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE Figure 60 Other than Direct Vent Clearance − Ventilated Combustion Air Option 25−24−65−2 NOTE: The following is based upon National codes for gas appliances, and is provided as a reference. Refer to Local codes which may supersede these standards and/or recommendations. (1 ) (2 ) Canadian Installations...
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Page 53: Maximum Equivalent Vent Length
INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE Table 14 MAXIMUM EQUIVALENT VENT LENGTH - Feet (Meters) Note: Maximum Equivalent Vent Length (MEVL) does NOT include elbows or terminations Use Table 15 − DEDUCTIONS FROM MEVL to determine allowable vent length for each application. DIRECT VENT (2-PIPE) AND NON-DIRECT VENT (1-PIPE) Altitude Unit Size... - Page 54 INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE Example 1 A direct-vent 60,000 BTUH furnace installed at 2100 ft. (640M). Venting system includes FOR EACH PIPE 100 feet (30 M) of vent pipe, 95 feet (28 M) of combustion air inlet pipe, (3) 90º long-radius elbows, (2) 45º long-radius elbows, and a factory accessory concentric vent kit.
- Page 55 INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MVE Table 16 MAXIMUM EQUIVALENT VENT LENGTH - Feet (Meters) Note: Maximum Equivalent Vent Length (MEVL) does NOT include elbows or terminations. Use DEDUCTIONS FROM MEVL − Table 15 to determine allowable vent length for each application. Note: Vent sizing for Canadian installations over 4500 ft.
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Page 56: Maximum Allowable Exposed Vent Lengths
15.0 114.0 88.0 -20 (-30) 28.7 21.6 34.7 26.8 N/A 15.0 15.0 69.0 48.0 15.0 85.0 62.0 -40 (-40) 21.0 14.6 25.9 18.9 Specifications subject to change without notice. 440 01 4400 03 Copyright 2013 International Comfort Products Lewisburg, TN 37091 USA...