https://articlescad.com/cat-fl....ap-cover-for-winter-
Cat flaps are a great way to allow your pet to come and go at their own pace. You can also opt for an enclosed cat flap to prevent other animals and cats from gaining access to your home. Installing a cat flap to a bifolding door is possible as long as the door frame is made from toughened glass. The frame must not be damaged or rotten. The procedure is similar to installing a cat flap on an old wooden door or uPVC. Easy to install A cat flap added to your bifold doors will allow your pet to go in and out of the home freely,