Drainage, Waste & Vent第 6 / 120 题
A horizontal building drain changes direction with a fitting that turns the flow 90 degrees. What does the code require at that point?
a.A backwater valve
b.A relief vent
c.A cleanout
d.An indirect waste receptor
解析
A cleanout is required at each change of direction of the building drain or horizontal waste line that exceeds 45 degrees, because a 90 degree turn is the point most likely to trap a stoppage. A backwater valve protects against sewer backflow, a relief vent relieves pressure in a stack, and an indirect waste receptor handles unconnected discharge, so none of them satisfies the access requirement.
法律依据: UPC §708.1免费刷完整 120 道题库 — 无需注册。
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