https://www.openlearning.com/u..../smithhaahr-smy9b2/b
https://jacobson-vittrup-2.fed....eratedjournals.com/c
A cat flap can create a draught if it's left open. This is a challenge that many cat owners face. A draught-exclusion device can help to reduce cold air coming into the home, but an animal flap that is insulated will offer greater protection against the elements. Tomsgates offers a selection of cat flaps that are insulated and dog doors that can be used for any type of installation including wall installations.