Automatic damper assembly

摘要: An automatic temperature and pressure responsive damper assembly for use within the conduit of a ventilating system designed to exhaust air from confined space atmosphere when reaches preselected or in is greater than that adjacent atmosphere. The includes at least one vane pivotally mounted conduit, preferably two, vanes being so they are movable between generally opened position, wherein can pass freely through closed passage blocked. A drive detects therein acts upon provided such change expansion causes move their position. Biasing means urging subjected aforementioned differential normally