https://writeablog.net/spoonso....rt85/cat-flap-instal
If you leave your cat's flap open, it can create draft. This is a problem that many cat owners have to deal with. A draught excluder can minimise cold air entering the home, but a cat flap that is insulated will offer greater protection against the elements. Tomsgates has a range of insulated cat flaps and dog doors that can be used for any type of installation, including wall installations. The Material One of the most important elements of the cat door is its insulation. is what keeps cold air out and warm in. Insulation
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