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A door made of upvc with a cat flaps can help reduce draughts in your home. By keeping your pets in and out of cold air, you can reduce heating costs. While it is possible to install a cat flap in both upvc and double glazing sealed units, it is more difficult than with doors made of wood. This is because upvc is available in different thicknesses. Benefits Having a cat flap fitted to your door is a great way of keeping your pet in or out of the home but still allowing