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A upvc door panel with cat flaps can help reduce draughts in your home. You can save money by keeping your pet inside and the cold air outside. While it is possible to install a cat flap in double glazing as well as upvc sealed units, it is more difficult than installing doors made of timber. This is because upvc is available in various thicknesses. Benefits A cat flap installed on your door will allow you to keep your pet inside or outside the house, while still let other people in. It also