https://moparwiki.win/wiki/Pos....t:Get_a_UPVC_Door_Pa
A cat flap allows you to allow your pet to roam more freely while avoiding the headache of having to let them in and out. It will also help your pet be less stressed and stop them from entering your home when they're not needed. To install a cat flap take a measurement of the distance from the bottom of the cat's stomach down to the floor. Draw a line across the door's panel. Make sure the line is level using an ad hoc level. 1. The type of door If you're installing an animal flap onto the uPVC door panel or dou