Combustion Air And Ventilation For Appliances Located In Unconfined Spaces; Combustion Air And Ventilation For Appliances; Insulation Blankets; Located In Confined Spaces - Kenmore POWERMISE 12 Owner's Manual

• Do not cover the instruction manual. Keep it on the side of
the water heater or nearby for future reference.
• Do obtain new warning and instruction labels from Sears for
placement on the blanket directly over the existing labels.
• Do inspect the insulation blanket frequently to make certain
it does not sag, thereby obstructing combustion air flow.
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
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
aggregate input rating of all appliances installed in that space.
A. A LL AIR FROM INSIDE BUILDINGS:
(See Figure 9 and Figure 10)
The confined space should 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 should be considered in making this
determination. Each opening should have a minimum free
area of one square inch per 1,000 Btu per hour (22 cm
kW) of the total input rating of all gas utilization equipment
in the confined space, but not less than 100 square inches
(645 cm ). One opening should commence within 12 inches
2
(30 cm) of the top and one commencing within 12 inches (30
cm) of the bottom of the enclosures.
FIGURE 10.
B. ALL AIR FROM OUTDOORS: (See Figures 9, 11,12 and 13)
The confined space should 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 should communicate directly, or
by ducts, with the outdoors or spaces (crawl or attic) that freely
communicate with the outdoors.
per kW) of the
3
• When directly communicating with the outdoors, each opening
should have a minimum free area of 1 square inch per 4,000
Btu per hour (5.5 cm
in the enclosure, see Figure 12.
per kW) of the
3
/
2
• When communicating with the outdoors through vertical
ducts, each opening should have a minimum free area of
1 square inch per 4,000 BTU per hour (5.5 cm
total input rating of all equipment in the enclosure, see
Figure 12 on page 11.
• When communicating with the outdoors through horizontal
ducts, each opening should have a minimum free area
of 1 square inch per 2,000 BTU per hour (11 cm
total input rating of all equipment in the enclosure, see
Figure 14.
• Alternatively a single permanent opening may be used when
communicating directly with the outdoors, or with spaces that
freely communicate with the outdoors. The opening should
have a minimum free area of 1 square inch per 3,000 BTU
per hour (8.3 cm
enclosure. See Figure 13.
11
FIGURE 11.
/kW) of total input rating of all equipment
2
FIGURE 12.
/kW) of total input rating of all equipment in
2
/kW) of
2
/kW) of
2