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How to Prepare an Opening to Replace Bifold Doors If you're planning to replace your existing bifold doors, it's important to choose the right ones. Be sure that they are sealed and weatherproofed to avoid water infiltration, air leaks, and colder indoor temperatures. To ensure a smooth installation, have a helper. The kit you choose should have a combined width about an inch less than the framed opening and 1 to 2 inches smaller in height to allow for proper floor cle