Patent ID: 7886486

Claim:
A pet door comprising: a first subframe assembly disposed on one side of an aperture; a second subframe assembly disposed on another side of the aperture opposite the one side of the aperture; a fastener attached to said first and second subframe assemblies and extending through the aperture, said fastener connecting said first and second subframe assemblies together such that tightening said fastener draws said first and second subframe assemblies towards one another to fix said subframe assemblies relative to the aperture; and a plurality of core frames, said plurality of core frames including fastening means for removably attaching said plurality of core frames to one another and to said first and second subframe assemblies, wherein said core frames extend laterally between said first and second subframe assemblies and within the aperture and define a polygonal passageway through which a pet can pass, and wherein said core frames are sandwiched by and held in the aperture between said first and second subframe assemblies and wherein said fastener does not extend through said core frames.