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Incorporating a cat flap into your bifold doors will provide many benefits for you and your feline companion. It can also prevent extreme heat or cold from entering your home. The first step is to measure your pet to determine the size of the flap you will need. This will help you make a hole that is adequate for the flap. Outdoor Access Even those with basic DIY skills can install a cat flap on an external back door. This will help you avoid the expense and headache of hiring a carpenter or handyman to do the job for you.