321 Studios FLF085D36E, FH110D48E Minimum Ventilation Openings, ALL Ventilation AIR from Outdoors

TABLE 9

MINIMUM VENTILATION OPENINGS

		Recommended
	Min. Ventilation	Opening
		(2 Required)
	Opening
Model	Square Inch	Size	Sq. In.
FH085D36E	240	8 x 16	128
FH110D48E	280	9 x 18	162
FH110D60E	280	9 x 18	162
FLF085D36E	290	8 x 19	152
FLR085D36E	290	8 x 19	152
FLF110D48E	340	9 x 19	171
FLF110D60E
FLR110D48E	340	9 x 19	171
FLR110D60E
FLR140D60E	360	9.5 x 19	180
FC085D36E	240	8 x 16	128

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 13, 14, & 15.)

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 13

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.

MIS-1337

Manual 2100-422 Page 23