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A cat flap could cause an air draught when left open. This is a problem that many cat owners face. A draught excluder can to reduce cold air coming into the home, but an animal flap that is insulated will offer more protection from the elements. Tomsgates provides a range of insulated dog doors and cat flaps that are suitable for any type of installation that include wall installations. The Material One of the most important aspects of the cat door is its insulation. Insulation keeps cold air out and warm in.