Patent ID: 7413024

Claim:
A self-closing venting system for preventing fire from penetrating through vents, comprising in combination: a wall with a vent opening, the wall comprising a firewall of a vehicle, dividing an engine compartment space from a passenger space, a self-closing vent, comprising: a frame defining a central opening, a screen contained within the frame and covering the central opening while allowing free flow of air therethrough, the screen being formed in a honeycomb configuration with openings having a dimension of about ⅛ to ¾ inch and a depth of about ⅛ to 1 inch, the screen being coated with a layer of an intumescent material which closes the screen openings when subjected to heat produced by a fire, the intumescent material being a high-performance ammonium polyphosphate-based intumescent coating, and the self-closing vent being mounted on the wall to cover the vent opening.