https://opensourcebridge.scien....ce/wiki/Cat_Flap_Ins
A upvc-clad panel with a cat flap can reduce draughts within your home. You can save money by keeping your pets inside and letting cold air out. It is possible to put an opening for a cat flap in both upvc panels and double glazing glass sealed units however it can be more difficult than doors made of timber. This is because upvc is available in different thicknesses. Benefits A cat flap that is installed on your door will allow you to keep your pet inside or outside the house, while permitting other people to enter
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