Donotapplyinsulationtothetopofthewaterheater,asthis commencewithin12inches(30cm)of thetopandone
willinterferewithsafeoperationofthedrafthood. commencingwithin12inches(30cm)of thebottomofthe enclosures.
Donotcovertheouterdoor,thermostatortemperature&
pressurereliefvalve.
Donotallowinsulationtocomewithin2"(50.8mm)ofthe
floortopreventblockageofcombustionairflowtotheburner.
DonotcovertheinstructionmanualKeepitonthesideof.
thewaterheaterornearbyforfuturereference.
DoobtainnewwarningandinstructionlabelsfromSearsfor placementontheblanketdirectlyovertheexistinglabels.
Doinspecttheinsulationblanketfrequentlytomakecertain itdoesnotsag,therebyobstructingcombustionairflow.
CHIIVINEY OR GAS VENT
Combustion Air and Ventilation for
Appliances 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 Appliances Located in Confined Spaces.
Combustion Air and Ventilation 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 3 per kW) of the aggregate input rating of all appliances installed in that space.
A. ALLAIR FROM INSIDE BUILDINGS:
(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
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 less than 100 square inches (645 cm2). One opening shall
FIGURE 10.
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 (crawl or attic) that freely
communicate with the outdoors.
CHIMNEY OR |
|
GAS VENT | VENTiLATiON LOUVERS |
OUTLET AiR
, WATER HEATER
FURNACE
• iNLET AiR 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 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 cm2/kW) of total
input rating of all equipment in the enclosure. See Figure 12.
11
