•DoobtainnewwarningandinstructionlabelsfromSearsfor placementontheblanketdirectlyovertheexistinglabels.
•Doinspecttheinsulationblanketfrequentlytomakecertain itdoesnotsag,therebyobstructingcombustionairflow.
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
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
