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It is recommended to hire an professional to install a cat-flap inside your home. DIY projects usually result in poorly-fitted pet flaps that allow in drafts and result in more energy costs. SheffLOCK can be installed as a cat flap on all kinds of doors like wood, uPVC, composite and glass doors as well as exterior walls. It takes about 2 hours to put up the new cat flap. Pet flaps cost money A pet flap allows your cat to move around whenever it pleases. If the flap isn't properly installed, it will let heat escape from your