Donotapplyinsulationtothetopofthewaterheater,asthis commencewithin12inches(30cm)of thetopandone
willinterferewithsafeoperationofthedrafthood. commencingwithin12inches(30cm)of thebottomofthe enclosures.
Donotcovertheouterdoor,thermostatortemperature&
pressurereliefvalve.
Donotallowinsulationtocomewithin2"(50_mm)ofthe8 floortopreventblockageofcombustionairflowtotheburner.
DonotcovertheinstructionmanualKeepitonthesideof thewaterheaterornearbyforfuturereference.
DoobtainnewwarningandinstructionlabelsfromSears forplacementontheblanketdirectlyovertheexistinglabels.
Doinspecttheinsulationblanketfrequentlytomakecertain it doesnotsag,therebyobstructingcombustionairflow.
Combustion Air and Ventilation for
Appmiances Located in Unconfined Spaces
UNCONFINED SPACE is space whose volume is not less than 50 cubic feet per 1,000 Btu per hour (4.8 m 3 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 Appfiances Located in Confined Spaces.
FIGURE1&
B. ALL AIR FROM OUTDOORS: (See Figures 9, 11,12 and 13)
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 (craw! or attic)
that freely communicate with the outdoors.
VENT&ATUON LOUVERS
END OF ATTIC_
Combustion Air and Ventimation for
Appliances Located in Confined Spaces
CONFINED SPACE is a space whose volume is less than 50 cubic feet per 1,000 Btu per hour (4.8 m _ per kW) of the aggregate input rating of all appliances installed in that space.
A. ALL AIR FROM INSmDE BUmLDgNGS:
(See Figure 9 on page 9 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
al! 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 al!
gas utilization equipment in the confined space, but not less
than 100 square inches (645 cm2). One opening shal!
ALT. INLETAIR VENTULATUON LOUVERS
FmGURE11,
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 cm_/kW) of total input rating of all equipment in the enclosure, see Figure 12.
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 cm_/kW) of total
input rating of all equipment in the enclosure, see Figure 12.
11
