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Cats enjoy watching out of windows. This is sometimes referred to as cat TV. It's a natural and enjoyable activity that is usually hunter-like. You can install glass window inserts that have cat flaps on existing windows or doors. can be fitted in double glazing. Easy to install Cat flaps are installed in all kinds of doors and windows made of glass including single glazing, double glazing, french doors and patio doors, bifold doors, and leaded units. These are ideal for people who don't want to cut into a wall or door and