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If you leave your cat's flap open, it may create a draft. This is a common problem experienced by cat owners. A draught excluder can help cut down the amount of cold air that is able to enter the house. However will offer better protection against the elements. Tomsgates offers a variety of dog doors insulated and cat flaps that work for any type of installation, including wall installations. The Material One of the most important features of a cat door is its insulation. This is what will keep cold air out and warm air in. Insulation