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It is possible to put an animal flap into the door panel made of upvc or double glazing glass sealed unit however the best choice is to have a new glass pane with an already-made hole. Follow the directions that should be included with the kit for cat flaps, and follow them carefully. Make sure that the shape you have drawn (be it circle or square) is accurately depicted on your template drawing. Safety If you have a cat or dog and want to let them in the garden without having the door open, a microchip-activated pet fl