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Your cat and you can both benefit from having an animal flap into your bifold door. It can also help prevent extreme cold or hot weather from entering your home. The first step is to measure your pet's size to determine the size of the flap you'll need. This will help you design an opening for your cat flap that is of the right size. Outdoor Access Even those with no DIY skills can manage to install a cat flap to an exterior back door. This will save you the expense and hassle of hiring a handyman or carpente