Abstract: An improved temperature-responsive wall ventilator construction comprising a housing having side walls defining an air flow passageway, a plurality of louvers disposed in said passageway and operatively attached to opposed side walls of the housing for pivotal movement to control the flow of air through the passageway. A temperature-responsive bimetallic coil spring located in the passageway and in an opening through one of the louvers controls pivotal movement of the louvers in the passageway to regulate the flow of air therethrough. One end of the coil spring is mounted directly to a face of one of the louvers, and the other end portion of the coil spring extends into an opening in a side wall of the housing to serve as sole pivotal support for one end of the louver. Temperature changes cause expansion and contraction of the spring which causes corresponding pivotal movement of the louver.

Abstract: An improved wall ventilator for use in building constructions comprising a housing having peripheral wall members defining a ventilating passageway therethrough, a supporting lattice extending across the passageway and defining a narrow elongate slot, a manually adjustable louver section having a plurality of panels extending in side by side relation across the passageway behind the support lattice and being interconnected for pivotal movement about adjacent side edges of each other, hinge means pivotally interconnecting an end one of the plurality of panels to an adjacent side wall portion of the housing, and a manually engageable control knob attached to the opposite end one of the plurality of panels extending through the lattice slot and slideable therealong to fold and unfold the panels upon themselves about their interconnected side edges to open and close the ventilating passageway of the housing.

Abstract: 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.

Abstract: 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 positi

Abstract: An automatic temperature responsive ventilator including a housing having side walls defining an air passageway and an openwork grid across the passageway. At least one shutter is mounted within the housing, with one end of one shutter element being associated with a bimetallic spring that is received within an opening in one housing side wall. A cap is received over the spring from the outside to hold the spring in place and protect the spring from the elements and from damage during installation. An outer end of the spring is held by a slot in the side wall and an inner end of the spring is secured to a rod that is attached to the shutter. Variations in ambient temperature cause the shutter element to open and close automatically.