CHIMNEY OR
GAS VENT
EQUIPMENT IN CONFINED SPACE
ALL AIR FROM OUTSIDE
(Inlet Air from Crawlspace and Outlet Air to Ventilated Attic)
VENTILATION LOUVERS
(Each end of altic)
I ...... I
OUTLET
FURNACE AIR WATER
HEATER
VENTILATION INLET
LOUVERS AIR
(For unheated crawl ._
_1 _rrrm rrrm I
NOTE-The inlet and outlet air openings shall each have a free area of at least one square inch (645
mm2) per 4, 000 Btu (1.17 kW) per hour of the total input rating of all equipment in the enclosure.
CHIMNEY
OR GAS
VENT'_
EQUIPMENT IN CONFINED SPACE
ALL AIR FROM OUTSIDE
(All Air Through Ventilated Attic)
VENTILATION LOUVERS
(Each end of attic)
FURNACE
INLET AIR
Ends 12 in.
above bottom
HEATER
NO TE-The inlet and outlet air openings shaft each have a
free area of at least one square inch (645 mm 2)per 4,000
Btu (1.17 kW) per hour of the total input rating of aft equip-
ment in the enclosure.
FIGURE 4
FIGURE 3
A _ EQUIPMENT IN
TT_. JJ_ CONFINED SPACE
I I "b__JY _ ALLAIRFROM
!lq!ll
NLET AI
II II l . . 1T-T. II II II IL_
I I I I I I I I I I I___J
I I I I I I I I I I I
I I I I I I I I I I I I
NOTE - Each air duct opening shaft have a free area of at least
one square inch (645 mm 2)per 2,000 Btu (.59 kW) per hour of
the total input rating of aft equipment in the enclosure. If the
equipment room is located against an outside wall and the air
openings communicate directly with the outdoors, each open-
ing shaft have a free area of at least one square inch (645 mm 2)
per 4,000 Btu (1.17 kW) per hour of the total input rating of aft
other equipment in the enclosure.
FIGURE 5
Page 8
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