Combustion Air And Ventilation Appliances; In Unconfined Spaces; In Confined Spaces - Kenmore POWER MISER 153.331712HA Owner's Manual

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 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 less
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
VENTILATION LOUVERS
(EACH END OF ATTIC)
OUTLET AIR
WATER HEATER
FURNACE
INLET AIR DUCT
ALT. INLET AIR VENTILATION LOUVERS
RGURE11.
• When directlycommunicating 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.
VENTILATION LOUVERS
(EACH END OF ATTIC)
" FURNACE
INLET AIR DUCT
(ENDS 1' OR 30 crn
ABOVE FLOOR)
NT
FURNACE WATER INGS
ER
r i i i i i i z • J
I I , , _ i = i
FIGURE10.
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.
RGURE12,
• When communicating with the outdoors through horizontal
ducts, each opening shall have a minimum free area of 1
square inch per 2,000 BTU per hour (11 cm2/kW) of total
input rating of all equipment in the enclosure. See
Figure 13.
11
II II
WATER HEATER
III T !!!
i
:': :.,:
P I (
RGURE13.
OUTLET AIR DUCT
INLET AIR DUCT