https://articlescad.com/cat-fl....aps-for-french-doors
https://blogfreely.net/cloverp....ot29/through-wall-ca
Cats love to look out through windows, a pastime sometimes referred to as cat TV. It's an instinctual and entertainment game that is usually hunter-like. Glass window inserts that have cat flaps to doors or windows. They can also be fitted to double glazing. Easy to Fit Cat flaps can be attached to most types of glass, including patio doors, french doors, bifolds, and single-glazed windows. These are ideal for people who do not want to cut into a door or wall and