https://securityholes.science/....wiki/Installing_a_up
If you keep your cat's flap open, it can create a draft. This is a problem many cat owners face. A draught-excluder can reduce the amount of cold air entering the house. However the cat flap can provide more protection from the elements. Tomsgates has a wide selection of dog doors insulated and cat flaps that work for any type of installation, including wall installations. The Material One of the most important features of a cat door is its insulation. Insulation keeps cold air out and warm inside. Insulation can