| 摘要 |
A soffit vent preventing an ingress of air while facilitating egress thereof, including a cylindrical frame containing an internal vent mechanism, which frame is mounted to the external surface of the soffit duct opening. The other end of the soffit vent is mounted on the vent duct. Within the cylindrical frame is an internal vent mechanism, comprising a cross beam defining two interstices, each interstice having a vent flap on the downstream side. A tension means holds the flaps closed, until the pressure within the building is greater than that outdoors, which pressure pushes the flaps open.
|
