507276-05CPage 8 of 57 mrcool.com
Figure 5.
Inside
Air from Outside
Figure 6.
Outside
(Inlet Air from Crawl Space and Outlet Air to
Ventilated Attic)
Figure 7.
Outside
(All Air through Ventilated Attic)
Figure 8.
Outside
OUTLET AIR
INLET AIR
NOTE−Each air duct opening shall have a free area of at least one
square inch per 2,000 Btu (645mm
2
per .59kW) per hour of the total
input rating of all equipment in the enclosure. If the equipment room
is located against an outside wall and the air openings communi-
cate directly with the outdoors, each opening shall have a free area
of at least 1 square inch per 4,000 Btu (645mm
2
per 1.17kW) per
hour of the total input rating of all other equipment in the enclosure.
ROOF TERMINATED
EXHAUST PIPE
SIDE WALL
TERMINATED
EXHAUST PIPE
(ALTERNATE
LOCATION)
FURNACE