| 摘要 |
A vent apparatus comprises a mount with air flow opening for mounting to a wall, a housing covering the mount, and a door pivoted to fall by gravity to a closed position but being movable to an open position when air flows from the air outflow passageway. The housing forms a downwardly and outwardly open chute extending well below a bottom of the mount and door, thus discouraging birds from approaching the air flow opening. The door and mount include bottom flanges that overlap when the door is in the closed position, further discouraging bird entry. The mount, housing and door are all metal with stiffening bends that are relatively simple construction, making assembly tow cost and providing a reliable function. The housing does not include large horizontal surfaces, thus discouraging birds and animals from building a nest in or on the housing. |
| 主权项 |
1. A vent apparatus for assembly to a building exterior wall, comprising:
a mount adapted for attachment to a building exterior wall and having an air flow opening generally matching an air outflow passageway in the building exterior wall; a housing attached to and covering the mount, the housing including a top wall, opposing side walls, and an angled wall connecting the top and side walls; and a door pivoted to the mount for movement by gravity to a closed position but being movable to an open position when air flows out from the air outflow passageway; the side walls joining with the angled wall to form a downwardly and outwardly-extending chute extending below a bottom edge of the mount and door, whereby the angled wall and side walls make bird access to the air outflow opening very difficult. |
