Combustion And Ventilation Air - COZY W255GPPR Instructions D'installation Et D'utilisation

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When installed, this gas appliance must be provided with fresh air for combustion, ventilation, and dilution of hot flue gases. The

minimum required volume of the area where the appliance is installed should be 50 cubic feet per 1,000 btu/hr.

If installed in an area of the home that is considered an unconfined space, the natural infiltration of air around windows and doors will be

adequate. If the area is considered a confined space (less than 50 cubic feet per 1,000 btu), fresh air can be supplied by providing two

permanent openings into adjoining rooms. Each opening shall have a minimum free area of one square inch per 1,000 btu per hour of

the total input rating of all gas appliances in the confined space, but not less than 100 square inches. One of the openings shall be within

12 inches of the ceiling and one within 12 inches of the floor. See Figure 1-A.

If the home is of unusually tight construction (new and remodeled homes), free air must be supplied through opening(s) to the outdoors.

This can be accomplished by providing 2 permanent openings, one commencing within 12 inches of the ceiling and one within 12 inches

of the floor. These openings shall communicate directly with the outdoors, or spaces that communicate freely with the outdoors, such as

a ventilated attic and crawl space through galvanized or equivalent corrosion-resistant

ducts. Exception: unobstructed stud and joist spaces are acceptable ducts provided that

not more than one fire block is removed. Special provisions must be taken to insure that

these stud and joist spaces cannot be blocked with insulation or other objects. Each of

these openings using vertical ducts shall have a minimum free area of one square inch

per 4,000 btu/hr of total input rating of all gas appliances. See Figure 1-B and 1-C. If

horizontal ducts are used, the minimum free area shall be one square inch per 2,000 btu/

hr of total input rating of all gas appliances.

Fresh make-up air can also be provided through a duct to one permanent opening

commencing within 12 inches of the ceiling. The minimum free area of this opening shall

be one square inch per 3,000 btu/hr of the total input rating of all gas appliances but not

less than the sum of the areas of all vent connectors in the space. See Figure 1-D.

When calculating the amount of fresh air needed you must include make-up air

requirements for the operation of exhaust fans, kitchen ventilation systems, clothes

dryers, and fireplaces.

Additional information can be found in the latest edition

of ANSI Z223.1 (National Fuel Gas Code).

FIG. 1-B

UL Listed Vent Cap

UL Listed Gas Vent

Ventilation Louvers

Ventilation

Louvers for Unheated Crawl Space

All Combustion Air from Outdoors. Inlet Air from

Ventilated Crawl Space & Outlet Air to Ventilated Attic