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If you keep your cat's flap open, it could create draft. is a problem that many cat owners face. A draught-exclusion device can help minimise cold air entering the house, but an animal flap with insulation will provide more protection from the elements. Tomsgates offers a selection of cat flaps insulated and dog doors suitable for any installation, including wall installations. The Material Insulation is among the most important characteristics of a cat-door. This is what will keep cold air out and warm air