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and ventilation air. 5. When sizing grille or louver, use the free area of opening. If Furnaces require ventilation openings to provide sufficient air for free area is NOT stamped or marked on grill or louver, as- proper combustion and ventilation of flue gases. All duct or open-sume a 20% free area for wood and 60% for metal. ings for supplying combustion and ventilation air must comply with National Fuel Gas Code, NFPA54/ANSI Z223.1, 2002 (or current Confined Space Installation edition) and applicable provisions of local building codes. NOTE: A confined space is defined as an area with less than 50 This furnace can NOT be common vented or connected to any cubic feet per 1,000 BTUH input rating for all gas appliances type B, BW or L vent or vent connector, nor to any portion of a facto- installed in the area. ry-built or masonry chimney. If this furnace is replacing a previous ly common-vented furnace, it may be necessary to resize the Requirements existing vent and chimney to prevent oversizing problems for the other remaining appliance(s). See "Venting and Combustion Air Provide confined space with sufficient air for proper com Check"in this section, This furnace MUST be vented to the outbustion and ventilation of flue gases using horizontal or ver side. tical ducts or openings. Figure 5 illustrate how to provide combustion and ventilation air. A minimum of two permanent openings, one inlet and one outlet, are required. Outside Air (This is ONLY a guide. Subject to codes of country having jurisdiction.) Gas Vent CableVent This installation.J NOT approved in Canada GasVen_. x. c,,en .... ,dNI a___aOut,et Outlet Air (1)') I I II Soffit Vent _ / ;_.-u,atio.'>_ .ir(1)I JL__.q311I II IIII II r-q I I ]OutletAir'l' _] I SoffitVent In.let _4........I I_;:;:,1 ___.L_U, tnlet quired I I A _ _ -_ I I IIII II MinimumOnelnletandOneOutletAirSupplyisReMay bein any Combination Shown Inlet _ ,r_o, I _"_1 I I I Inlet Air Opening Must be Within12" of floor alternate lnlet Air (1) AIr(l) _ Iq [_:_"r_r _ilrei2 ) OutletAirOpeningMustbeWithinl2"ofceiling (1)1SquareInchper4000BTUH (2)1SquareInchper2000B]-UH 3. One opening MUST be within 12" of the floor and the sec5. Horizontal duct openings require I square inch of free area ond opening within 12" of the ceiling. per 2,000 BTUH of combined input for all gas appliances in 4. Size openings and ducts per Table 1. area (see Table 1). 6. Vertical duct openings or openings directly to outside require 1 square inch of free area per 4,000 BTUH for combined input of all gas appliances in area (see Table 1). E_ 440 01 1020 04 Free Area BTUH MinimumFreeArea Requiredfor Each Opening Input HorizontalDuct VerticalDuctoropenings RoundDuct Rating (2,000 BTUH) to outside(4,000 BTUH) (4,000 BTUH) 50,000 25 sq. in. 12.5 sq. in. 4" 75,000 37.5 sq. in. 1825 sq. in. 5" 100,000 50 sq. in. 25 sq. in. 6" 125,000 62.5 sq. in. 3125 sq. in. 7" 150,000 75 sq. in. 37.5 sq. in. 7" EXAMPLE: Determining Free Area Appliance 1 Appliance 2 Total Input 100,000 + 30,000 = (130,000 + 4,000) = 32.5 Sq. In. Vertical Appliance 1 Appliance 2 Total Input 100,000 + 30,000 = (130,000 + 2,000) = 65 Sq. In. Horizontal One permanent opening, commencing within 12" of the top of the enclosure, shall be permitted where the equipment has clear ances of at least 1" from the sides and back and 6" from the front of the appliance. The opening shall directly communicate with the outdoors or shall communicate through a vertical or horizontal duct to the outdoors or spaces (crawl or attic) that freely communi cate with the outdoors, and shall have a minimum free area of: • 1 sq. in per 3000 Btu per hr. of the total input rating of all equipment located in the enclosure, and • Not less than the sum ofthe areas of all vent connectors in the confined space. Unconfined Space Installation CARBON MONOXIDE POISONING HAZARD Failure to supply additional air by means of ventilation grilles or ducts could result in death and/or personal injury. An unconfined space or homes with tight construction may not have adequate air infiltration for proper combustion and ventilation of flue gases. Most homes will require additional air. An unconfined space is defined as an area having a minimum volume of 50 cubic feet per 1,000 Btuh total input rating for all gas appliances in area. Refer to Table 2 for minimum area required. I Unconfined Space Minimum Area in Square Feet BTUH Input Minimum Area in Square Feet Rating 50,000 312 78,000 49O 114,000 712 155,000 968 EXAMPLE: NOTE: Square feet is based on 8 foot ceilings. 28,000 BTUH X 50 Cubic Ft. = 1,400 = 175 Sq. Ft. 1,000 8' Ceiling Height NOTE: Refer to definitions in section titled Unusually Tight Construction, If any one of the conditions apply, the space MUST be considered confined space regardless of size. 1. Adjoining rooms can be considered part of an unconfined area if there are openings without doors between rooms. 2. An attic or crawl space may be considered an unconfined space provided there are a...

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