https://blogfreely.net/hookfor....ce39/cat-flap-instal
It's simpler than you think to put an animal flap inside a solid uPVC panel or a sealed double glazed unit. If you don't have the right tools or no experience, you'll require a professional. Learn how to measure and mark the area of the uPVC panel for your cat flap. Also, how to make it weather and draft resistant. Safety A upvc door with cat flaps is a great option to ensure your pet's security and still allow them to move freely. These panels are made of recycled materials, and require minimal maintenance. They are also en