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Infiltration rates ume than 50 cubic feet per 1,000 BTUH of the maximum input rat-greater than 0.60 ACH shall not be used. The minimum required ings for all gas appliances installed in the space. The standard volume of the space varies with the number of ACH and shall be method permits indoor air to be used for combustion and ventila determined per Table 2 or Equations 1 and 2. Determine the tion air. minimum required volume for each appliance in the space, and The Known Air Infiltration Rate Method shall be used if the in-add the volumes together to get the total minimum required volfiltration rate is known to be less than 0.40 air changes per hour ume for the space. MINIMUMSPACEVOLUMEFOR100%COMBUSTION ANDVENTILATIONAIR FROMINDOORS(ft 3) Other Than Fan-Assisted Total Fan-assistedTotal .............................................................. (1,OOO'sBtuh) (1,000'sBtuh) ACH 30 40 50 50 75 I 100 125 I 180 0.60 1,050 1,400 1,750 1,250 1,875 2,500 3,125 3,750 0.50 1,260 1,680 2,100 1,500 2,250 3,000 3,750 4,500 0.40 1,575 2,100 2,625 1,875 2,813 3,750 4,688 5,625 0.30 2,100 2,800 3,500 2,500 3,750 5,000 6,250 7,500 0.20 3,150 4,200 5,250 3,750 5,625 7,500 9,375 11,250 0.10 6,300 8,400 10,500 7,500 11,250 15,000 18250 22,500 0.00 NP NP NP NP NP NP NP NP NP = Not Permitted Table 2 Minimum Space Volumes were determined by using the main open and NOT have any means of being closed off. Venfollowing equations from the National Fuel Gas Code ANSI tilation openings to outdoors MUST be at least 1 square inch Z223.1/NFPA 54-2002, 8.3.3.2: of free area per 4,000 BTUH of total input rating for all gas appliances in the space. 1. For other than fan-assisted appliances such as a draft In spaces that use the Indoor Combustion Air Method, inhood- equipped water heater, filtration should be adequate to provide air for combustion, ventilation and dilution of flue gases. However, in buildings 21 ft 3 ( I other ) with unusually tight construction, additional air MUST be pro- Volume other = ACH 1000 Btu / hr vided using the methods described in section titled Outdoor Combustion Air Method: 2. For fan-assisted appliances such as this furnace, Unusually tight construction is defined as Construction with: 1. Walls and ceilings exposed to the outdoors have a con- Volume fan = ACH 1000 Btu / hr tinuous, sealed vapor barrier. Openings are gasketed or sealed and 15ft3 ( Iran ) 2. Doors and openable windows are weather stripped and If: [ other= combined input of all other than fan-assisted 3. Other openings are caulked or sealed. These include appliances in Btu/hr joints around window and door frames, between sole plates and floors, between wall-ceiling joints, between wall panels, at penetrations for plumbing, electrical and [fan = combined input of all fan-assisted appliances in Btu/hr gas lines, etc. ACH = air changes per hour (ACH shall not exceed 0.60.) Ventilation Air The following requirements apply to the Standard Method and to Some provincial codes and local municipalities require ventilation the Known Air Infiltration Rate Method. or make-up air be brought into the conditioned space as replacement air. Whichever method is used, the mixed return air tempera • Adjoining rooms can be considered part of a space, if there ture across the heat exchanger MUST not fall below 60 ° are no closable doors between rooms. continuously, or 55 ° on an intermittent basis so that flue gases will • An attic or crawl space may be considered a space that freely not condense excessively in the heat exchanger. Excessive con- communicates with the outdoors provided there are adequate densation will shorten the life of the heat exchanger and possibly ventilation openings directly to outdoors. Openings MUST re-void your warranty. 5. Gas Vent Installation This Category [ furnace is fan-assisted. Category ] furnace definition: A central furnace which operates CARBON MONOXIDE POISONING, FIRE AND with a non-positive vent static pressure and with a flue loss not EXPLOSION HAZARD. less than 17 percent. These furnaces are approved for common- venting and multi-story venting with other fan-assisted or draft Failure to properly vent this furnace could result in hood-equipped appliances in accordance with the NFGC or death, personal injury and/or property damage. NSCNGPIC Read and follow all instructions in this section. Category I Safe Venting Requirements Install the vent in compliance with codes of the country having ju-Category ] furnace vent installations shall be in accordance with risdiction, local codes or ordinances and these instructions. Parts 10 and 13 of the National Fuel Gas Code (NFGC), ANSI 441 O1 2613 02 Z223.1-2002/N54-2002;SectionCof FPAand/or7andAppendixtheCSAB149.1-05,NationalStandardNatural ofCanada,Gas andPropaneInstallationCode;thelocalbuildingcodes;furnace andventmanufacturer's instructions. NOTE: The following instructions comply with the ANSI Z223.1/NFPA 54 National Fuel Gas Code and CSA B149.1 Natu ral Gas and Propane Installation...

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