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Roof Terminated
Exhaust Pipe
* See Maximum Vent Lengths table
NOTE: The inlet and outlet air openings shall each have a free
area of at least one square inch per 4,000 Btu (645 mm
1.17 kW) per hour of the total input rating of all equipment in the
enclosure.
Figure 8. Equipment in Confined Space
(Inlet Air from Ventilated Attic & Outlet Air to Outside)
Roof Terminated
Exhaust Pipe
Ventilation
Furnace
Louvers
(Crawl Space)
Coupling or
3 in. to 2 in.
Transition
(Field Provided)
* See Maximum Vent Lengths table
NOTE: The inlet and outlet air openings shall each have a free
area of at least one square inch per 4,000 Btu (645 mm
1.17 kW) per hour of the total input rating of all equipment in the
enclosure.
Figure 9. Equipment in Confined Space
(Inlet Air from Ventilated Crawl Space & Outlet Air to
507867-02
Ventilation Louvers
Inlet Air
(Minimum 12 in.
(305mm) above
Attic Floor)
*Intake Debris
Screen
(Provided)
Furnace
Inlet Air
Minimum
12 in. (305mm)
above Crawl
Space Floor
*Intake Debris Screen Provided
Outside)
per
2
Figure 10. Equipment in Confined Space - All Air from
Shipping Bolt Removal
Units with 1/2 hp and 3/4 hp blower motors are equipped
with three flexible legs and one rigid leg. The rigid leg
is equipped with a shipping bolt and a flat white plastic
washer (rather than the rubber mounting grommet used
with a flexible mounting leg). See Figure 11. The bolt and
washer must be removed before the furnace is placed into
operation. After the bolt and washer have been removed,
the rigid leg will not touch the blower housing.
per
2
Issue 1922
Outside
Units with 1/2 HP and
3/4 HP Blower Motors
Figure 11.
Page 9 of 55
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