Thoát nước, Nước thải & Thông hơiCâu 132 / 360
What is the minimum diameter permitted for a vent pipe, regardless of the fixture it serves?
a.1/2 inch
b.3/4 inch
c.1 inch
d.1-1/4 inches (32 mm)
Giải thích
No vent pipe may be smaller than 1-1/4 inches in diameter. In addition, a vent must generally be at least one-half the diameter of the drain it serves. Undersized vents are prone to clogging and cannot relieve pressure fast enough to protect trap seals.
Luyện miễn phí toàn bộ 360 câu hỏi — không cần đăng ký.
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