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A upvc panel that has a flap for cats can help to reduce draughts within your home. You can save money by keeping your pets inside and the cold air outside. Although it is possible to install a cat flap in double glazing as well as upvc sealed units, it can be more difficult than with timber doors. This is due to the fact that upvc comes in different thicknesses. Benefits A cat flap installed on your door allows you to keep your pet inside or outside the house, while still permitting other people to enter. It