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Composite door cat flaps are a popular choice among homeowners. They provide secure entrance for your pet. It also reduces the possibility of unwanted critters entering your home. To install the cat flap, you will require an expert and have a thorough understanding of the door's composite composition. Any structural modifications could compromise its integrity, and affect its thermal performance. Adding a cat flap to a composite door A cat flap lets your pet enter and exit the home without allowing in other animals or cats.