713.11 Sterilizer Vent Stack Sizes

The minimum size of a sterilizer vent serving a bedpan steamer shall be 1¹/₂ inches (38 mm) in diameter. Multiple installations shall be sized in accordance with Table 713.11.1.

TABLE 713.11.1
STACK SIZES FOR BEDPAN STEAMERS AND BOILING-TYPE STERILIZERS
(Number of Connections of Various Sizes Permitted to Various-sized Sterilizer Vent Stacks)

STACK SIZE (inches)	CONNECTION SIZE
	11/2"		2"
11/2a	1	or	0
2a	2	or	1
2b	1	and	1
3a	4	or	2
3b	2	and	2
4a	8	or	4
4b	4	and	4

The size of a sterilizer vent stack shall be not less than 2 inches (51 mm) in diameter where serving a utensil sterilizer and not less than 1¹/₂ inches (38 mm) in diameter where serving an instrument sterilizer. Combinations of boiling-type sterilizer vent connections shall be sized in accordance with Table 713.11.1.

Pressure sterilizer vent stacks shall be 2¹/₂ inches (64 mm) minimum. Those serving combinations of pressure sterilizer exhaust connections shall be sized in accordance with Table 713.11.3.

TABLE 713.11.3
STACK SIZES FOR PRESSURE STERILIZERS (Number of Connections of Various Sizes Permitted To Various-sized Vent Stacks)

STACK SIZE (inches)	CONNECTION SIZE
	3/4"	1"	11/4"	11/2"
11/2a	3 or	2 or	1	—
11/2b	2 and	1	—	—
2a	6 or	3 or	2 or	1
2b	3 and	2	—	—
2b	2 and	1 and	1	—
2b	1 and	1 and	—	1
3a	15 or	7 or	5 or	3
3b	1 and	1 and 5 and	2 and	2 1

The diameter of a sterilizer vent stack serving an instrument washer sterilizer shall be not less than 2 inches (51 mm). Not more than two sterilizers shall be installed on a 2-inch (51 mm) stack, and not more than four sterilizers shall be installed on a 3-inch (76 mm) stack.