https://articlescad.com/adding....-a-composite-door-ca
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The addition of a cat flap to your door is an essential task that should be carried out by a professional. The doors are typically made of a plastic exterior that is bonded to an insulating, soft polystyrene core. These materials are often difficult to cut. It's much simpler to install a cat flap in an existing pane of glass or have a new door manufactured with the hole already drilled. A glazier is in a position to assist you. Easy to Fit I
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