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Your cat and you can both benefit from having the cat flap inside your bifold door. It can also help stop extreme heat or cold weather from entering your home. The first step is to measure your pet's size to determine the size of the flap you will need. This will help you design a cat flap hole that is of the right size. Outdoor Access Even those with minimal DIY skills can install a cat flap onto an outside back door. This will save you the expense and stress of hiring a carpenter or ha