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How to Prepare an Opening to Replace Bifold Doors It is crucial to choose the correct bifold doors when you want to replace your old doors. Be sure they're weatherproofed and sealed properly to stop water infiltration and air leaks. To ensure a smooth installation, get a partner to assist. The kit should be an inch smaller in width than the frame opening and between 2 and 1 inch shorter in height to ensure you have enough space for the floor. The right doors to choose The kind of door you select can make