https://scientific-programs.sc....ience/wiki/Cat_Flap_
It is possible to fit an animal flap into the door panel made of upvc or double glazing glass sealed unit, although the best option is to have a new glass pane that has an already-made hole. Follow the instructions provided with the kit. Ensure that the shape drawn (be it a square or circle) is accurately depicted on your template drawing. Safety If you have a dog or cat and would like to let them in the garden without opening the door, a microchip-activated pet flap in your door's upvc panel is a great c
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