Pressure sterilizers.
Municipal Code of Chicago § 18-29-713.11.3
in effect18-29-713.11.3 Pressure sterilizers.
Pressure sterilizer vent stacks shall be 2 1/2 inches (64 mm) minimum. Those serving combinations of pressure sterilizer exhaust connections shall be sized in accordance with Table 18-29-713.11.3.
Table 18-29-713.11.3
Stacks Sizes for Pressure Sterilizers (Number of Connections of Various Sizes Permitted to Various- Sized Vent Stacks)
Stack Size (inches) | Connection Size
3/4" | 1" | 1 1/4" | 1 1/2"
Stack Size (inches) | Connection Size
3/4" | 1" | 1 1/4" | 1 1/2"
1 1/2 a | 3 or | 2 or | 1 | –
1 1/2 b | 2 and | 1 | – | –
2 a | 6 or | 3 or | 2 or | 1
2 b | 3 and | 2 | – | –
2 b | 2 and | 1 and | 1 | –
2 b | 1 and | 1 and | – | 1
3 a | 15 or | 7 or | 5 or | 3
3 b | 1 and | 1 and 5 and | 2 and | 2 1
For SI: 1 inch = 25.4 mm.
a. Total of each size.
b. Combination of sizes.
Source: City of Chicago, Municipal Code of Chicago (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2692297Fetched: 10/24/2026