The PetSafe Extreme Weather Aluminum Pet Door - Large protects home in any climate by eliminating drafts in the winter and conserving air conditioning in the summer. It can be easily install in most exterior doors including paneled wood PVC and metal doors of 1-1/2 to 2 inches thick. This pet door is insulated to block 3 times more thermal energy than a standard pet door. It also includes adjustable flexible flaps with a magnetic seal to keep the weather outside where it belongs.