UPVC door panels are a long-term alternative to composite doors. They are durable, effective and fireproof. Additionally, they are affordable and easy to maintain. A double-glazed sealed unit with already cut a hole for the cat flap is the simplest method to install an animal flap inside a uPVC sheet. https://cat-flap-double-glazing59468.blog2freedom.com/30704020/how-much-does-a-cat-flap-cost