CSLB C-36 Plumbing ContractorRough-in PlumbingHard
A plumbing contractor is roughing in a new residential DWV system. A 2-inch horizontal wet vent is planned to serve a shower and a lavatory. What is the maximum developed length permitted for this 2-inch horizontal wet vent?
- A8 feet
- B15 feet
- C12 feet
- D10 feet
Show answer & explanationAnswer & explanation
Correct answer: D. 10 feet
Horizontal wet vents have specific length limitations based on their diameter to ensure adequate venting and prevent trap seal loss. For a 2-inch horizontal wet vent, the Uniform Plumbing Code (UPC) typically allows a maximum developed length of 10 feet.
Why the other options are wrong
- A. This length is too short for a 2-inch wet vent and not a standard maximum.
- B. This length is generally too long for a horizontal wet vent of this diameter.
- C. This length exceeds the typical maximum for a 2-inch horizontal wet vent.
Horizontal Wet Vent Length
The maximum allowable developed length of a horizontal pipe that serves as both a drain and a vent for fixtures, limited by code to ensure effective trap seal protection.
- Pipe acts as both drain and vent.
- Length limits are crucial for performance.
- Limits vary by pipe size and code.
Memory trick: Wet Vents need 'Exact Lengths' for proper breathing.