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Composite door cat flaps are a popular choice for homeowners. They offer a secure entrance for your pet. It also reduces the chance of unwanted critters getting into your home. But adding a cat flap your composite door requires knowledge and understanding of the door's construction. Any structural modifications could compromise the integrity of the door and affect its thermal performance. The addition of a cat flap a composite door A cat flap lets your pet enter and exit the home without allowing in other animals or cats. It also helps reduce heating cost