https://mack-qvist.technetblog....gers.de/cat-flap-ins
A upvc panel with an animal flap can help reduce draughts within your home. You can save money by keeping your pet inside and letting cold air out. Although it is possible to install a cat flap into both upvc and double glazing sealed units, it can be more difficult than with timber doors. This is due to different thicknesses of upvc. Benefits A cat flap that is installed on your door allows you to keep your pet inside or out of the house, while still let other people in. It also helps keep out stray cats and