A contractor is installing a new sink in a residential kitchen. Which of the following is the correct venting requirement for the sink drain?
- AThe vent must be a minimum of 1.5 inches in diameter.
- The vent must be a minimum of 2 inches in diameter.
- CThe vent must be a minimum of 1 inch in diameter.
- DThe vent must be a minimum of 3 inches in diameter.
Exam tip
Always verify the vent diameter requirements for fixtures to ensure proper drainage and prevent issues.
Why B is correct
Section P2803.1 of the 2024 International Residential Code specifies that the vent for a sink drain must be a minimum of 2 inches in diameter to ensure proper drainage and prevent siphonage.