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Dog Door Install - Double Glazed Window

I need a dog door installed into the bottom of a double glazed door (see pic attached). I understand that the bottom glass bit of the door will need to be replaced completely. Dog door dimensions are: Glass Cut hole size: Round hole 385mm diameter Overall size: 435mm diameter Flap Width: 295mm Flap Height: 300mm Glass is 810mm wide and roughly 750mm high (will need to do a more accurate measure but these can be used a guide for now).