| 摘要 |
A ventilator for barns and the like, having a generally rectangular housing (12), containing duct work, adapted to fit through a wall or roof of the building. The housing (12) has an inside and an outside end and at its inside end, the housing (12) has an intake fan (28) for drawing air inwardly, and an outlet fan (30) for drawing air from the interior of the building. At its outside end, the housing comprises a transfer chamber (36) with air outlet openings (48) on one side of said chamber and air intake openings (46) on the other side of said chamber. A two part damper (50a, b) is movably mounted within the transfer chamber (36), the two parts being swingable towards and away from one another. A linkage arrangement (60a, b) interconnects the two parts of the damper so that they move in unison in opposite directions in response to operation of a drive motor (64). This enables the ventilator to operate in two modes, a first mode in which it draws in fresh air and expels stale air simultaneously and a second mode in which it recirculates the air within the building, according to the settings of the damper parts. In intermediate settings both modes of ventilation can take place at the same time. The two fans (28, 30) and associated motors are mounted on a mounting frame (22) which is hingedly connected to the housing (12) to facilitate servicing of the ventilator.
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