Drainage, Waste & VentCâu 5 / 120
A fixture drain serving a lavatory is 1-1/2 in in diameter. What is the smallest vent size that may serve it?
a.1 in
b.1-1/4 in
c.1-1/2 in
d.2 in
Giải thích
A vent must be at least one-half the diameter of the drain it serves but never smaller than 1-1/4 in. Half of 1-1/2 in is 3/4 in, so the 1-1/4 in floor controls. A 1 in vent violates the absolute minimum, while 1-1/2 in and 2 in are larger than required and are not the smallest permitted size.
Luyện miễn phí toàn bộ 120 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- What is the maximum developed length permitted between the trap weir and the vent opening for a 1-1/2 in trap arm?
- Except for traps specifically designed as deep seal traps, what is the required liquid seal depth of a fixture trap?
- A 4 in building drain runs 96 ft from the last fixture connection to the point where it leaves the structure. Installed at the code minimum slope for its size, what is the total fall?
- A horizontal building drain changes direction with a fitting that turns the flow 90 degrees. What does the code require at that point?
- A 2 in trap arm serves a floor-mounted fixture. The trap weir is at elevation 0. What is the greatest amount the trap arm may fall before it reaches the vent connection?
- Which trap arrangement is expressly prohibited because it will siphon its own seal?
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