Thoát nước, Nước thải & Thông hơiCâu 134 / 360
In a cold climate subject to frost closure, a vent through the roof must be enlarged to a minimum of 3 inches. Where must that increase in size be made?
a.6 inches before passing through the roof
b.At least 12 inches (305 mm) inside the building before the vent passes through the roof
c.24 inches above the roof
d.Only at the roof line itself
Giải thích
In frost-closure climates, a vent terminal must be at least 3 inches in diameter to resist closing off from frost. The increase from the smaller vent size must be made at least 12 inches inside the building before the pipe penetrates the roof. This keeps the enlarged, warmer section below the freezing zone.
Trích dẫn luật: 2022 California Plumbing Code (CPC) §906.0Luyện miễn phí toàn bộ 360 câu hỏi — không cần đăng ký.
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