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A cat flap can create an air draught when left open. This is a common issue encountered by cat owners. A draught-exclusion device can help minimise cold air entering the home, but a cat flap that is insulated can provide more protection from the elements. Tomsgates offers a variety of insulated cat flaps and dog doors suitable for any installation, including wall installations. The Material One of the most important aspects of a cat door is its insulation. This is what will keep cold air out and warm air in