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A cat flap is an excellent option to give your pet the freedom to roam and ease the burden of getting them out and in. It can also help your pet to be less anxious and will stop them from entering your home when they're not allowed to do so. To install a cat flap to install a cat flap, measure the distance from the bottom of the cat's stomach down to the floor. Draw a line along the door's frame. Make sure the line is straight using an ad hoc level. 1. The type of door It is recommended to consult an expert to install a cat flap on an uPVC