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It is possible to fit the cat flap inside a door panel made of upvc, or a double glazing glass sealed units however the best choice is to have a new glass pane with a premade hole installed. Read the instructions that should be included in the kit for cat flaps, and follow them closely. Make sure that the template illustration accurately depicts the shape (circle or square). Safety If you have a cat or dog and want to let them into the garden without opening the door, a microchip-activated pet flap in your door p