| 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. 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.
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