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How to Prepare an Opening to Replace Bifold Doors If you're looking to replace your existing bifold doors, it's important to select the right one. Make sure they're properly sealed and weatherproofed to stop water infiltration, air leaks, and colder indoor temperatures. To ensure an easy installation, get a partner to assist. The kit you choose should have a width that is one-quarter of an inch smaller than the opening frame and between 1 and 2 inches less in height to allow for adequate floor clearance.