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How to Prepare an Opening to Replace Bifold Doors It's important to select the correct bifold doors when you want to replace your existing doors. Make sure they're properly sealed and weatherproofed to stop air leaks, water infiltration and colder indoor temperatures. To ensure an easy installation, have a helper. The kit should be one inch wider than the frame opening and between 1 and 2 inches smaller on height to ensure you have enough clearance for the floor. The right doors to choose The kind of door