https://postheaven.net/wallcha....rd5/using-upvc-cat-f
A cat flap allows you to give your pet more freedom while saving you the headache of having to let them in and out. It can also help your pet be less stressed and stop them from entering the house when they're not wanted. To fit a cat flap on your door, measure from the bottom of their stomach to the floor and draw a line on the door panel. Verify that the line is level using an ad hoc level. 1. The type of door It is recommended to consult a professional if you want to install a cat flap on a uPVC or double glazing glas