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.