https://scientific-programs.sc....ience/wiki/Upvc_Door
This double-flap, insulated cat flap offers good protection in different climates. It can be installed in wood, uPVC, glass, and metal doors. A tightly sealing door is crucial, particularly in cold weather. It can prevent warm air from getting sucked out and cold air from entering, saving you money on energy costs. Wind Resistance By preventing cold air entering your home and allowing warm air inside the home, a cat flap cover keeps it warm. The best options come with magnet seals and are protected by insulation. T