Manual 2100-579A
Page
31 of 41
ALL VENTILATION AIR FROM OUTDOORS
A. The confined space shall be provided with two
permanent openings, one in or near the top of
the enclosure and one in or near the bottom. The
openings shall communicate directly, or by means
of ducts with outdoors or to such spaces (crawl or
attic) that freely communicate with outdoors. (See
Figures 14, 15 & 16.)
B. When directly communicating with outdoors or by
means of vertical ducts, each opening shall have
a free area of not less than one square inch per
4,000 BTU per hour (35 square inches per gallon
per hour) of total input rating of all appliances in
the enclosures. If horizontal ducts are used, each
opening shall have a free area of not less than one
square inch per 2,000 BTU per hour (70 square
inches per gallon per hour) of total input of all
appliances in the enclosure.
FIGURE 14
APPLIANCES LOCATED IN CONFINED SPACES
ALL AIR FROM OUTDOORS
NOTE: Each air duct opening shall have a
free area of not less than one square
inch per 2,000 BTU per hour (70
square inches per gallon per hour) of
the total input rating of all appliances
in the enclosure.
TABLE 9
MINIMUM VENTILATION OPENINGS
Model
Min.
Ventilation
Opening
Square
Inch
Recommended
Opening
(2 Required)
Size
Sq. In.
FLF075V42A
290
8 x 19
152
FLR075V42A
290
8 x 19
152
FLR100V48A
FLR100V60A
340
9 x 19
171
FLR130V60A
360
9.5 x 19
180