Adjustably resettable, temperature-responsive automatic ventilator

摘要

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. An inner end of the spring is secured to a rod that is attached to the shutter. A setting plug is received in the opening in the side wall to hold the spring in place and to preset the tension in the spring which drives the shutter between an open and closed position relative to the passageway. Variations in ambinet temperature cause the shutter element to open and close automatically.