Patent ID: 6918827

Claim:
A chimney cap, comprising: a cage formed from one piece of substantially flat perforated rectangularly shaped metal, said metal bent to form a substantially rectangularly configured box, opposites sides of said box being substantially similar in size, each side of said box having an integral flange that extends perpendicular to its respective side, said cage being expanded such that each side of said box is trapezoidal in shape, where the top span of at least one side of said box is larger than the bottom span of said at least one side of said box; a securing mechanism adapted to securing said cage to inside a flue; a strongback fastened to a pair of opposite flanges of said sides of said box, said strongback adapted to receive said securing mechanism, said strongback comprising a channel and two flanges; wherein said securing mechanism further comprises: a bracket; a first rod positioned in a first direction and threaded vertically through said bracket; and second and third rods each attached to said bracket in a second direction transverse from said first direction.