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A popular option for homeowners, a composite cat flap provides a secure entry point for your pet. It also lowers the chance that unwanted critters will enter your home. To install the cat flap, you'll need to be an expert and have a thorough knowledge of the composition of the composite door. Any structural modifications could compromise its integrity, and affect its thermal performance. Add a cat flap on a composite door A cat flap allows your pet to ent