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You and your cat will both benefit from having the cat flap inside your bifold door. It also helps to keep extreme hot or cold weather from entering your home. The first step is to measure your pet in order to determine what size door flap is required. This will help you make a hole that is adequate for the flap. Outdoor Access While installing a cat flap inside an exterior back door is not an easy task for a novice, even those with a little DIY experience can usually manage it. This will help you avoid the cost