https://ai-db.science/wiki/Cat...._Flap_Installation_I
A door made of upvc that has a cat flaps can help lessen the draughts inside your home. By keeping your pets warm and cold air out you will save money on heating bills. Although it is possible to install a cat flap on double glazing and upvc sealed units, it can be more challenging than with timber doors. This is because upvc is available in different thicknesses. Benefits A cat flap that is attached to your door is a great way to keep your pet inside or out of the house but still allowing guests in. It also keeps out unwanted