A couple of nice magnet power item powerplan I located:
Wall Model Pet Door
Image by Hale Pet Door
The Hale Pet Door wall model pet door is the most energy effective dog door.
Because the greater space amongst the double flaps makes it possible for much more air space to be trapped, there's a lot more insulation amongst the outside and inside air.
The Alnico magnets catch the stainless steel strikes for good closure. The brush pile weatherstripping maintain insects, dust and dirt out of the