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If you leave your cat's flap open, it may create draft. This is a challenge that many cat owners face. A draught-excluder can reduce the amount of cold air that is able to enter the home. However an animal flap can provide more protection from the elements. Tomsgates offers a selection of insulated cat flaps and dog doors suitable for any installation, including wall installations. The Material One of the most important elements of the cat door is its insulation. This is what keeps cold air out and warm air in