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How to Prepare an Opening to Replace Bifold Doors It is crucial to choose the right bifold doors if you are looking to replace your old doors. Be sure that they are sealed and weatherproofed to avoid air leaks, water infiltration and lower temperatures inside. To ensure an easy installation, you can have a helper. The kit you choose should have a width that is 1/8 of an inch less than the opening that is framed and 1 to 2 inches shorter in height to allow for proper floor clearance. Selecting th