https://fkwiki.win/wiki/Post:C....at_Flap_Double_Glazi
A upvc-clad panel with a flap for cats can help to minimize draughts in your home. You can save money by keeping your pets inside and letting the cold air out. Although it is possible to install a cat flap into both upvc and double glazing sealed units, it can be more challenging than with timber doors. This is due to the fact that upvc comes in a variety of thicknesses. Benefits A cat flap placed on your door allows you to keep your pet inside or outside the home, while allowing other people in. helps keep out unwanted pests and str