| 摘要 |
An improved wall ventilator for use in building constructions comprising a housing having a peripheral wall member defining an air flow passageway, a first louver section comprising a fixed panel having a plurality of openings therethrough and attached to said peripheral wall members to extend across a front portion of the passageway, a second movable louver section comprising a plurality of movable panels extending in side by side relation and having a plurality of openings extending therethrough and alternately spaced with respect to the openings in the first louver section fixed panels whereby imperforate portions of each section of panels overlie the openings of the other when the movable second section panels are located in a common plane and in a first position immediately adjacent the rear face of the fixed panel to close the housing passageway, and a temperature responsive bimetallic spring operatively connected to the movable panels to pivot the same away from the first fixed panel to a second position where the movable panels lie in non-parallel planes to expose the openings through the panels and permit passage of air through the housing passageway. The housing and louver sections of the ventilator may be formed of molded plastic material to provide a lightweight construction having nominal moving parts.
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