Abstract: A dual fitting chimney cap adapted to be connected to chimney stacks of differing sizes, the chimney cap including a cylindrical housing having an upper housing portion formed with a plurality of apertures, and a lower housing portion for attachment to an upper open end of a chimney stack of conforming cylindrical contour, the lower housing portion having a cylindrical cross-section of a presecribed diameter, and an annular transition portion integrally interposed between and interconnecting the upper and lower housing portions, the annular transition portion including a first annular region and a second annular region integral with and interconnected to the first annular region, the first annular region having a prescribed diameter larger in dimension than the diameter of the second annular region and also larger in dimension than the diameter of the lower housing portion, the second annular region having a prescribed diameter smaller in dimension than the diameter of the lower housing portion.

Abstract: A chimney cap for protecting the upper open end of a chimney flue from the ingress of undesirable elements, such as squirrels, raccoons and birds or the like, is disclosed. The cap comprises a housing having four (4) perforated sides which are integral in succession with one another, the four sides being formed from a flat metal blank the longitudinal span of which is greater than the transverse span thereof, the blank including along one longitudinal edge thereof four (4) flanges integral with and extending transversely outwardly of the blank, the flanges being spaced in longitudinal succession from one another. The foregoing abstract is neither intended to define the invention disclosed, nor is it intended to be limiting as to the scope in any way.