https://opensourcebridge.scien....ce/wiki/Cat_Flap_Fit
A upvc door panel with cat flaps can help lessen the draughts inside your home. By keeping your pets warm and out of cold air, you can save money on heating bills. Although it is possible to install a cat flap into double glazing and upvc sealed units, it can be more difficult than installing timber doors. This is due to different thicknesses of upvc. Benefits A cat flap installed on your door allows you to keep your pet inside or out of the home, while permitting other people to enter. It also keeps out any stray cats or other pes
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