| 摘要 |
A ventilation-pipe plug includes a tubular sleeve having a sleeve outside periphery smaller than a ventilation pipe inside periphery. The sleeve includes an inlet end for receiving a gas and a hollow head attached to an end of the sleeve opposite the inlet end to allow the gas to flow from the sleeve into the head. The head includes a head outside periphery larger than the sleeve periphery diameter. The head also includes a plurality of passageways sized to allow egress of the gas from the head and to prevent ingress of animals and debris into the head.
|
