Trane DX1C100A9481A, UX1C100A9481A, UX1C080A9601A, UX1C100A9361A, UX1B080A9421A manual Confined Space

MINIMUM AREA IN SQUARE FEET FOR UNCONFINED SPACE INSTALLATIONS

FURNACE	WITH 8 FT. CEILING
MAXIMUM BTUH	MINIMUM AREA IN SQUARE FEET
INPUT RATING	OF UNCONFINED SPACE
60,000	375
80,000	500
100,000	625
120,000	875

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CONFINED

SPACE

1.All air from inside the building as in Figure 8: The confined space shall be provided with two perma- nent openings communicating directly with an addi- tional room(s) of sufficient volume so that the com- bined volume of all spaces meets the criteria for an unconfined space. The total input of all gas utiliza- tion equipment installed in the combined space shall be considered in making this determination. Refer to Table 2 for minimum open areas require- ments.

2.All air from outdoors as in Figure 9: The confined space shall be provided with two permanent open- ings, one commencing within 12 inches of the top and one commencing within 12 inches of the bot- tom of the enclosure. The openings shall communi- cate directly, or by ducts, with the outdoors or spaces (crawl or attic) that freely communicate with the outdoors. Refer to Table 2, for minimum open areas requirements.

TABLE 2

MINIMUM FREE AREA IN SQUARE INCHES

EACH OPENING (FURNACE ONLY)

Furnace	Air	Air From Outside
Maximum
	From
BTUH/INPUT
	Inside	Vertical	Horizontal
Rating
		Duct	Duct
60,000	100	15	30
80,000	100	20	40
100,000	100	25	50
120,000	120	30	60

Installer’s Guide

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18-CD19D6-32 9