Cover assembly for attic fans

Claim 1

A cover assembly for a fan assembly mounted in an opening in a ceiling, the fan assembly including a vertical frame having a peripheral, laterally extending, normally horizontal rim in face to face engagement with the ceiling circumscribing said opening, the cover assembly comprising: a shell of dimensions to cover the opening in the ceiling provided for said fan assembly, the shell having a normally horizontal main panel of essentially the same size as said opening, a wall circumscribing said main panel and extending from said panel toward said ceiling in substantial alignment with said frame and a normally horizontal lip circumscribing said wall and extending outwardly therefrom in face to face relationship with said rim when the shell is in place; said main panel and said wall defining a recess in the shell extending away from said opening and in facing relationship thereto when the cover assembly is in place; heat insulating material within said recess and filling the same to a level coincident with the plane of said lip; sealing means between said lip and said rim when the cover assembly is in place; and means engaging said lip and said rim for securing the cover assembly to the frame.