https://squareblogs.net/chordl....yric3/upvc-door-pane
A cat flap lets you to give your pet more freedom while saving you the burden of letting them in and out. It can also help your pet to be less anxious and will stop them from entering the home when they're not welcomed. To place a cat flap on your door you need to measure from the bottom of their stomach to the floor and mark an outline on the door panel. Check that the line is straight using an ad hoc level. 1. The type of door If you are installing the cat flap to a uPVC door panel or a double glazing glass seal