Drainage, Waste & VentCâu 21 / 120
An air admittance valve is used to vent an island sink. Which statement describes a correct installation?
a.It may be buried in insulation inside a sealed wall cavity
b.It relieves positive pressure in the drainage system
c.It must be accessible and located above the fixture trap weir
d.It replaces the need for any vent open to the atmosphere in the building
Giải thích
An air admittance valve must remain accessible for service and be installed above the trap weir of the fixture it serves, in a space with air available to the valve. It admits air only and does not relieve positive pressure, it cannot be sealed off inside insulation, and the building still requires at least one vent open to the atmosphere.
Trích dẫn luật: IPC §917Luyện miễn phí toàn bộ 120 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- A single 3 in vent stack is 46 ft in developed length and serves a drainage stack. If the code limits a given vent size to a maximum developed length, exceeding that length requires which action?
- Two lavatories are installed back to back on opposite sides of a wall and discharge into the same double fitting at the same level. What vent arrangement is being used?
- A kitchen sink is located in an island counter where no wall is available for a conventional vent. Which venting method is designed for this condition?
- What is the maximum vertical distance permitted between a fixture outlet and the trap weir serving that fixture?
- A commercial kitchen has a two-compartment sink whose drain must not connect directly to the sanitary drainage system. How must it discharge?
- A basement floor is below the elevation of the next upstream manhole on the public sewer. What device is required to protect the fixtures on that floor?
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