A bathroom in a multi-family residential building has a combined water usage of 5 gallons per minute. What is the minimum vent size required for this bathroom, according to the 2024 International Residential Code?
- A1.5 inches
- 2 inches
- C3 inches
- D4 inches
Exam tip
Be familiar with the vent sizing requirements based on water usage as per the code.
Why B is correct
According to Section P2704.2 of the 2024 IRC, the minimum vent size for a bathroom with a combined water usage of 5 gallons per minute is 2 inches. Option A is incorrect because it is smaller than the required size. Options C and D are incorrect because they are larger than the minimum required size.