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Your cat and you can both benefit from having the cat flap inside your bifold door. It can also stop extreme cold or heat from entering your home. The first step is to measure your pet's measurements to determine the size of the flap you will need. This will enable you to design a cat flap hole that is the correct size. Outdoor Access Even those with basic DIY skills can manage to install a cat flap to an external backdoor. This will cut down on the cost and headache of hiring a handyman or carpenter to do