Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Jack F. King, Jr.0
Date of Patent
July 30, 2019
Patent Application Number
15636954
Date Filed
June 29, 2017
Patent Citations Received
Patent Primary Examiner
Patent abstract
A passive ductwork intumescent fire damper is disclosed having a sheet metal box; an intumescent; a sheet metal comb; a plastic liner; a sheet metal comb catch; and a sheet metal escutcheon. The fire damper is particularly useful in a structural wall ducted horizontally such as a side wall range hood installation.
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