https://fkwiki.win/wiki/Post:U....sing_uPVC_Cat_Flap_D
A cat flap that is through the wall is a great method to let your pets move around as they please. However, you must be careful not to install it too high on the wall. This can cause energy loss and allow burglars to gain entry into your home. Also, if you are planning to sell your home in the near future having an opening in a cavity wall could pose an issue for new owners. Glass cat doors are a much safer choice. Easy to install A cat flap that is built into the wall is a great option to allow your cat to leave and come bac