Patent ID: 7055520

Claim:
device for detecting the flow of gas through at least one opening in an object, the device comprising: a. an inlet for pressurewise association with said opening for receiving said gas flow; b. a chamber having an interior in pressurewise association with said inlet; c. an outlet, located downstream of said chamber, and open to ambient pressure, said inlet, said chamber and said outlet being configured together for allowing passage through said device of said gas flow, and d. a pressure displaceable member having an inner face exposed to and contiguous with the interior of said chamber and an outer face exposed to the ambient pressure, said pressure displaceable member being a hinged member hingedly mounted along one end within said chamber such that said member is pivotally displaceable about said end as a result of a differential in respective pressures of said chamber interior and said ambient pressure, said displacement being indicative of said gas flow through said device.