| 摘要 |
A ventilator for clothes dryers and the like includes a counterflow heat exchanger through the wall of the building containing the apparatus, with an entry passage for ambient air entering the building and an exist passage for heated waste air leaving the building. An external housing defines an outlet chamber communicating with the exit passage, and an inlet chamber communicating with the entry passage. The chambers are both open to the ambience, and the two openings are adjacent one another, with a damper mounted for pivotal movement between a closed position in which the damper closes both of the openings, and an open position in which it opens both of the openings. The damper is biased toward the closed position, but is moveable toward the open position by a build-up of air pressure in the exit passage.
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