Damper with integral support

Claim 1

A prefabricated protective damper to be secured in a postion for blocking flow through a building passageway defined by a pair of generally parallel, spaced apart, longitudinally extending construction members, there being a member at each side of said passageway, said damper including: a rigid, peripherally extending, rectangular frame defining a damper opening, said frame having a pair of substantially parallel sides having generally flat outer surfaces; automatically actuatable means mounted on the frame for blocking fluid flow through the damper opening responsvie to elevation of the ambient temperature beyond a predetemined limit; and a pair of elongated, bendable straps of flat sheet steel material, said respective straps being secured intermediate the ends thereof to opposite sides of the frame and lying flat against the respective surface to minimize the space required for the damper prior to installation, the free ends of each strap being bendable away from the damper side surface into embracing relationship with a corresponding proximal construction member to quickly and easily secure the damper in fixed position across said passageway and against dislodgement from said position under the influence of substantial fluid forces against the damper.