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You and your cat can both benefit from having a cat flap in your bifold door. It can also help prevent extreme cold or hot weather from entering your home. First, you need to determine the measurements of your pet to determine the right size door flap is required. This will enable you to design an opening for your cat flap that is the correct size. Outdoor Access Even those with minimal DIY skills can manage to install a cat flap onto an outside back door. can help you avoid the expense and hassle of contacting a carpenter, joiner or handyman to complete