All Air From Inside Buildings; All Air From Outdoors - Kenmore 153.331350 Use & Care Manual

illustrations shown in this section of the manual
are a reference for the openings that provide fresh
air into confined spaces only. Do not refer to these
illustrations for the purpose of vent installation. See
"Venting" section for complete venting installation
instructions.
Chemical vapor corrosion of the flue, blower
assembly and vent system may occur if the air
supply contains certain chemical vapors. Spray can
propellants, cleaning solvents, refrigerator and air
conditioner refrigerants, swimming pool chemicals,
calcium and sodium chloride (water softener salt),
waxes, bleach and process chemicals are typical
compounds which are potentially corrosive.
All Air From Inside Buildings
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/hr (22cm2/kW) of the total input rating of all
gas utilization equipment in the confined space,
but not less than 100 square inches (645cm2). One
opening shall commence within 12" (300mm) of the
top and one commencing within 12" (300mm) of the
bottom of the enclosures (see Figure 15).
Figure 15
All Air From Outdoors
The confined space shall be provided with two
permanent openings, one commencing within 12"
(300mm) of the top and one commencing within
12" (300mm)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.
1. When directly communicating with the outdoors,
each opening shall have a minimum free area
of 1 square inch per 4,000 Btu/hr (5.5cm2/kW)
of total input rating of all equipment in the
enclosure (see Figure 16).
VENTILATION
LOUVERS
(EACH END OF ATTIC)
AL_INLET
AIR
'FURNACE
INLETAIR DUCT
VENTILATION LOUVERS
Figure 16
2. When communicating with the outdoors through
vertical ducts, each opening shall have a
minimum free area of 1 square inch per 4,000
Btu/hr (5.5cm2/kW) of total input rating of all
equipment in the enclosure (see Figure 17).
3. When communicating with the outdoors through
horizontal ducts, each opening shall have a
minimum free area of 1 square inch per 2,000
Btu/hr (11cm2/kW)) of total input rating of all
equipment in the enclosure (see Figure 18).
VENTILATION
LOUVERS
(EACH
WATER HEATER
-FURNACE
ENDS 1' (300 mm)
ABOVE FLOOR
Figure 17
23