https://imoodle.win/wiki/Fitting_a_Cat_Flap
A cat flap could cause a draught if it's left open. This is a problem many cat owners face. A draught excluder can help minimise cold air entering the house, but an animal flap with insulation will provide greater protection against the elements. Tomsgates provides a range of insulated dog doors and cat flaps that are suitable for all kinds of installations that include wall installations. The Material Insulation is one of the most important features of a cat-door. Insulation is what keeps cold air out and warm in. Insulation can be achieved