https://nerdgaming.science/wik....i/Cat_Flap_Installat
A cat flap can cause a draught if left open. This is a common problem that cat owners face. A draught-excluder can help reduce the amount of cold air that is able to enter the home. However an animal flap can provide more protection from the elements. Tomsgates offers a variety of cat flaps that are insulated and dog doors suitable for any type of installation, including wall installations. The Material One of the most important aspects of the cat door is its insulation. It is the thing that keeps cold air out and warm