Use and Care Manual

507277-03CPage 8 of 53 mrcool.com
Figure 4.
Inside
OPENINGS
(To Adjacent
Space)
NOTE : Each opening shall have a free area of at least one square inch
per 1,000 Btu(645 mm
2
per .29 kW) per hour ofthetotal inputratingof
all equipmentin the enclosure,but not lessthan 100squareinches
(64516 mm
2
ROOFTERMINATED
EXHAUSTPIPE
SIDEWALL
TERMINATED
EXHAUSTPIPE
(ALTERNATE
LOCATION)
FURNACE
).
Air from Outside
(Inlet Air from Crawl Space and Outlet Air to Ventilated Attic)
NOTE: Theinlet and outlet air openings shall each have a free area
of at least one square inch per 4,000 Btu (645 mm
2
per 1.17 kW) per
hour of the total input rating of all equipment in the enclosure.
OUTLET
AIR
INLET
AIR
VENTILATION
LOUVERS
(Forunheated
crawl space)
FURNACE
ROOFTERMINATED
EXHAUSTPIPE
VENTILATIONLOUVERS
(Each end of attic)
SIDEWALL
TERMINATED
EXHAUSTPIPE
(ALTERNATE
LOCATION)
Figure 5.
Outside
Figure 6.
Outside
(All Air Through Ventilated Attic)
NOTE: Theinlet and outlet air openings shall each have a free area of
at least one square inch per 4,000 Btu (645 mm
2
per 1.17 kW) per hour
of the total input rating of all equipment in the enclosure.
OUTLET
AIR
VENTILATION LOUVERS
(Each end of attic)
INLETAIR
(Ends12"above
bottom)
ROOFTERMINATED
EXHAUSTPIPE
SIDEWALL
TERMINATED
EXHAUSTPIPE
(ALTERNATE
LOCATION)
FURNACE
Figure 7.
Outside
OUTLET AIR
INLETAIR
NOTE: Each air duct opening shall have a free area of at least one
square inch per 2,000 Btu (645 mm
2
per .59 kW) 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 (645 mm
2
per 1.17 kW)per
hour of the total input rating of all other equipment in the enclosure.
ROOFTERMINATED
EXHAUSTPIPE
SIDEWALL
TERMINATED
EXHAUSTPIPE
(ALTERNATE
LOCATION)
FURNACE