| 摘要 |
An improved temperature regulated wall ventilator comprising a housing defining an air flow passageway therethrough, a plurality of louvers mounted in side by side relation in the housing passageway for pivotal movement about their longitudinal axes to open and close the air flow passageway, and temperature responsive helical spring control means located in the air flow passageway on an inner end portion of a stub shaft mounted on the housing. One end of the helical spring is attached to one of the louvers, and the other end of the spring is operatively attached to the stub shaft to prevent its relative rotation with respect thereto. The stub shaft is mounted in an opening of the housing wall, and, prior to installation of the ventilator in a wall opening, the stub shaft may be partially retracted from the housing wall and rotated to cause compression or contraction of the spring about its longitudinal axis, thereby varying the pressure of the spring on the louvers to establish a desired temperature at which the louvers are opened or closed.
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