Passive ductwork intumescent fire damper
AssigneeSuperposed Associates LLC
InventorJack F. KING, JR.
Life of this patent
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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.
Claims17
A passive intumescent fire damper for closing off an air stream in the event of a fire comprising a sheet metal box and an assembly adapted to fit into said sheet metal box comprising an intumescent, a sheet metal comb, and a plastic liner.
A passive intumescent fire damper for closing off an air stream in the event of a fire comprising a rectangular sheet metal box and an assembly adapted to fit into said rectangular sheet metal box comprising an intumescent, a sheet metal comb, a plastic liner, a sheet metal catch and a sheet metal escutcheon, wherein when said fire damper is subjected to a fire or heat said plastic liner will melt and said intumescent when subjected to a predetermined temperature will expand and is contained by said sheet metal comb and said assembly will close off the flow of air through said fire damper.
Dependencies are inferred from the claim text.