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A door made of upvc with a cat flaps can help lessen the draughts inside your home. By keeping your pets warm and keeping cold air out, you can save money on heating bills. It is possible to put cat flaps into the upvc panels as well as double glazing glass sealed units, however it is more difficult than doors made of wood. This is because there are different thicknesses of Upvc. Benefits A cat flap that is installed on your door will all