https://securityholes.science/....wiki/Cat_Flap_Glass_
A through-wall cat flap lets your pets come in and out whenever they want. However, you should be careful not to install it too high in the wall. This could lead to energy loss and the possibility of burglars gaining access to your home. If you are planning to sell your house in the near future and you have an opening in a cavity wall could pose an issue for prospective buyers. Glass cat doors are a much safer option. Easy to install A cat flap that is built into the wall is a great method to allow your cat to