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If you have a pet or a cat, installing a pet flap in your French or patio doors is a great idea. It lets them go in and out without needing to open the door. There are several options for cat flaps that are designed to fit in uPVC or composite doors as well as wooden doors. Some even have a four-way locking system that can be configured to let out only, in only, or open. Installation Cat flaps can be a great way to let your cat in and out of the house without opening the door each