| 摘要 |
A roof vent for sheet material roofs and for seamed metal roofs slides along the roof as the roofing sheet expands and contracts. The vent includes a base having a radially extending base flange and a generally cylindrical body portion extending upward from the base flange. The body portion of the base extends through an air ventilation opening provided in the roofing sheet. A double-sided adhesive ring is positioned between the upper surface of the base flange and the undersurface of the roofing sheet surrounding the opening for securing the base flange to the roofing sheet against movement or turning. A gasket is placed around the body portion of the base and abuts the upper surface of the roofing sheet for providing a watertight seal. A main body with a lower flange is placed over and connected to the body portion of the base. The outer surface of the body portion of the base includes male threads that are received by female threads provided on the lower, inner surface of the main body for effecting a tight connection by compressing the gasket against the roofing as supported by the base flange. Lower edges of the main body are stepped for mating with the L-shaped gasket. Multiple standoffs and a flow directing wall extend from upper edges of the main body. A cap is removably connected to the main body of the vent. The cap includes a sloped crown and side walls-extending downward and outward from outer edges of the crown. Receivers extend from the inner surface of the top for receiving the standoffs and a flow directing wall of the main body. When assembled, the side walls and crown of the cap prevent elements from entering the main body while permitting free air flow.
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