http://brewwiki.win/wiki/Post:Fitting_a_Cat_Flap
https://informatic.wiki/wiki/C....at_Flap_Installation
A cat flap can allow your pet to move around as they please. If it's not installed correctly it can let heat escape and also let other creatures of a smaller size into your home. Fortunately, local Taskers are experts in cat flap installation and can fit them quickly and safely. They'll also help you decide on the type of cat flap that's best for your wall or door. Security A cat flap is a great method to allow your pet to enter or leave the house wi