https://clinfowiki.win/wiki/Po....st:Cat_Flap_Installa
A door made of upvc that has a cat flaps can help lessen the draughts inside your home. You can save money by keeping your pet inside and letting cold air out. Although it is possible to install a cat flap into both upvc and double glazing sealed units, it is more difficult than installing doors made of wood. This is because upvc is available in various thicknesses. Benefits A cat flap placed on your door allows you to keep your pet inside or out of the house, while still allowing other people in. It