https://informatic.wiki/wiki/I....nstalling_a_upvc_Doo
Cats love to look out of windows, which is a form of entertainment often called cat TV. It's an instinctual and entertainment game that is usually hunter-like. You can fit glass window inserts with cat flaps to existing windows or doors. They can be fitted in double-glazed. Easy to Fit Cat flaps can be affixed to a variety of glass including french doors, patios, bifolds and single-glazed windows. These are ideal for people who don't want to cut into a wall or door and want to give their pet access to windows. It is imp