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What Are
Bi-Fold door?

Bi-fold windows, also called folding doors or accordion doors, have panels that are hinged to each other and fold open and closed like an accordion. Interior folding doors are often made of two panels. Exterior bi-fold doors can be comprised of many large, floor-to-ceiling glass panels. When open, exterior bi-fold doors can create enormous openings, up to 55 feet long.

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