Patent ID: 9376856
Filing Date: 2016-06-28
CPC Classification: B01D,B29C,E06B,F24F

Claim Text:
1. A hollow core door apparatus for preventing a pressure build up in a room having a forced air flow into the room comprising in combination: an inside skin; an opening in the inside skin; an outside skin; an opening in the outside skin; an outer frame; an inner concave groove on the outer frame; a tip extending outwardly from the inner concave groove; a center frame disposed within and spaced apart from the outer frame; an outer concave groove on the center frame, and the tip of the inner concave groove of the outer frame extends into the outer concave groove of the center frame to provide a non-linear passage for the air flow through the door and out of the room to prevent a pressure build up in the room; and the outer frame is appropriately secured in the openings in the inside and outside skins.