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Your cat and you can both benefit from incorporating the cat flap inside your bifold door. It also helps to prevent extreme heat or cold from entering your home. First, you need to measure your pet in order to determine the size of door flap you need. This will allow you to make a hole that is adequate for the cat flap. Outdoor Access Even those with no DIY skills can install a cat flap to an external backdoor. This will help you avoid the cost and stress