https://blogfreely.net/pincow0..../cat-flap-installers
This double-flap cat flap that is insulated offers good protection in different climates. It can be installed in wood, uPVC and glass doors. It is important to have a door that can be sealed well, especially in cold weather. It can prevent warm air from being sucked out and cold air from getting in which can save you money on energy costs. Wind Resistance By blocking cold air from entering your home and allowing warm air inside the cat flap, it will keep it warmer. The best options are those that have magnet seals and are prote