https://opensourcebridge.scien....ce/wiki/Cat_Flap_Fit
A door made of upvc that has a cat flaps can help lessen the draughts inside your home. You can save money by keeping your pet inside and letting the cold air out. While it is possible to install a cat flap into both upvc and double glazing sealed units, it is more challenging than with doors made of wood. This is due to the fact that upvc comes in various thicknesses. Benefits Having a cat flap fitted to your door is a great way of keeping your pet in or out of the house while allowing visitors in. It also keeps out stray
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