Lennox Allied Air A95UH1D Installation Instructions Manual page 9

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
507270-03
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 blower motor 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 1917
Outside
Units with 1/2 HP
Blower Motor
Figure 11.
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