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A cat flap can cause a draught if it's left open. 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 house. However the cat flap offers more protection from the elements. Tomsgates has a wide selection of insulated dog doors and cat flaps that are suitable for any type of installation including wall-mounted installations. The Material One of the most important aspects of the cat door is its insulation. This is what will keep cold air out and warm a