Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Stanley J. Demster0
Date of Patent
January 17, 2012
Patent Application Number
11938032
Date Filed
November 9, 2007
Patent Citations Received
Patent Primary Examiner
Patent abstract
An isolation damper for preventing the migration of air from a ventilated space includes a high differential pressure sealing chamber in the damper assembly that prevents the flow of air from the “clean” side of the damper assembly to the “dirty” side thereof. Pressurized air leaking out of the sealing chamber creates reverse flow leakage toward the dirty side which assures the clean side air is not contaminated by the dirty side air. Differential pressure between the sealing chamber and the dirty side is monitored with the differential pressure reported and alarmed externally if reductions in pressure indicate the sealing effect of the sealing chamber could be affected.
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