https://yogicentral.science/wi....ki/Fit_a_Cat_Flap_in
https://mozillabd.science/wiki..../Replacement_Upvc_Do
If you have a pet or a cat installing a pet flap in your French or patio doors is a good idea. It allows them to enter and exit without you needing to open the door. There are many cat flaps available designed to fit in uPVC, composite, or wooden doors. Some come with a four-way locking system that can be set for exit only or in-only. can be an excellent way to let your cat out and in of the home without having to open the door every time.