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It is possible to fit an animal flap into a upvc door panel or double glazing glass sealed unit however the best choice is to buy a new glass pane with a premade hole installed. Read the instructions that should be included in your cat flap kit, and follow them closely. Make sure the shape you've drawn (be it a square or circle) is accurately drawn on your template drawing. Safety If you have a cat or dog and want to allow them access to the garden without leaving the door open, a microchip activated pet flap in your door panel made of upvc is a fantastic option.