Kenmore 153.330642, 153.330652, 153.33062, 153.330632 owner manual ALL AIR from Inside Buildings

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Combustion Air and Ventilation for

Appliances Located in Unconfined Spaces

UNCONFINED SPACE is space whose volume is not tess than 50 cubic feet per 1,000 Btu per hour (4.8 m3 per kW) of the aggregate input rating of all appliances installed in that space. Rooms communicating directly with the space in which the appliances are installed, through openings not furnished with doors, are considered a part of the unconfined space.

In unconfined spaces in buildings, infiltration may be adequate to provide air for combustion, ventilation and dilution of flue gases. However, in buildings of tight construction (for example, weather stripping, heavily insulated, caulked, vapor barrier, etc.), additional air may need to be provided using the methods described in Combustion Air and Ventilation for Appliances Located in Confined Spaces.

Combustion Air and Ventilation for

Appliances Located in Confined Spaces

CONFINED SPACE is a space whose volume is tess than 50 cubic feet per 1,000 Btu per hour (4.8 m3 per kW) of the aggregate input rating of all appliances installed in that space.

A. ALL AIR FROM INSIDE BUILDINGS:

(See Figure 9 on page 10 and Figure 10 below)

The confined space shall be provided with two permanent openings communicating directly with an additional room(s) of sufficient volume so that the combined volume of all spaces meets the criteria for an unconfined space. The total input of all gas utilization equipment installed in the combined space shall be considered in making this determination. Each opening shall have a minimum free area of one square inch per 1,000 Btu per hour (22 cm2/kW) of the total input rating of all gas utilization equipment in the confined space, but not tess than 100 square inches (645 cm2). One opening shall commence within 12 inches (30 cm) of the top and one commencing within 12 inches (30 cm) of the bottom of the enclosures.

CHIMNEY OR GAS VENT

FURNAROPENINGS

[ ! I_! [--! i I" [_!

l [ 1 ! [ ! 1 _ 1 1

F t IJ J I-_1 ILIZr

FIGURE 10.

B. ALL AIR FROM OUTDOORS: (See Figures 9, 11,12,13 and 13A)

The confined space shall be provided with two permanent openings, one commencing within 12 inches (30 cm) of the top and one commencing within 12 inches (30 cm)from the bottom of the enclosure. The openings shall communicate directly, or

by ducts, with the outdoors or spaces (crawl or attic) that freely communicate with the outdoors.

CHIMNEY	OR
GAS VENT	VENTILATION	LOUVERS
	END	OF ATTIC)

OUTLETAIR

WATER HEATER

FURNACE

INLET MR DUCT

ALT. INLETAIR VENTILATION LOUVERS

FIGURE 11.

When directly communicating with the outdoors, each opening shall have a minimum free area of 1 square inch per 4,000 Btu per hour (5.5 cm2/kW) of total input rating of all equipment in the enclosure. See Figure 11.

When communicating with the outdoors through vertical ducts, each opening shall have a minimum free area of 1 square inch per 4,000 BTU per hour (5.5 cm2/kW) of total input rating of all equipment in the enclosure. See Figure 12.

VENTILATION LOUVERS

OF ATTIC)

WATER HEATER

•FURNACE

		INLET	AIR DUCT
		(ENDS	1'OR 30 cm
_	_:_, ' r' , , , L_!	ABOVEFLOOR)
171	1	•

FIGURE 12.

•When communicating with the outdoors through horizontal ducts, each opening shall have a minimum free area of

1square inch per 2,000 BTU per hour (11 cm2/kW) of total input rating of all equipment in the enclosure. See Figure 13.

•When ducts are used, they shall be of the same cross- sectional area as the free area of the openings to which they connect. The minimum short side dimension of rectangular air ducts shall not be less than 3 inches (76.2 mm). See Figure 13.

11