| 摘要 |
A bi-functional roof drain includes a housing forming a drain manifold and a drain outlet to connect to a drainage system. A vent pipe penetrates the housing a nd extends through the manifold. The top of the vent pipe is positioned a distance abov e the housing, which may be variable. With this drain, a method of retrofitting a roof drainage system to provide water drainage and system venting is also presented. This method includes removing an existing uni-functional roof drain from a deck penetration throu gh the roof, and installing a bi-functional roof drain in the same deck penetration. The drain outlet is connected to the drainage system and the vent pipe is connected to the syste m that requires venting. The height of a top opening of the vent pipe of the bi-functional roof drain may be adjustable in relation to a surface of the roof.
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