Systems & Code第 55 / 110 题
An air admittance valve (AAV) is used to vent an island fixture. Which condition must be met for the AAV to be acceptable?
a.It may serve as the only vent for the building
b.It may be buried in the wall permanently
c.It must be located in a ventilated, accessible space and at least 4 in above the horizontal branch drain
d.It replaces the need for any trap
解析
An AAV must be installed in a ventilated, accessible location and rise at least 4 in above the horizontal branch drain it serves, and it can never be the sole vent for a building. It admits air to relieve negative pressure but seals against sewer gas escaping. At least one vent must still open to atmosphere for the overall system.
法律依据: IPC §917.0免费刷完整 110 道题库 — 无需注册。
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