https://world-news.wiki/wiki/4...._Dirty_Little_Secret
Bi Fold Repairs - Save Money and Keep Your Home Secure If your bi fold doors are hard to open or allow a draft it is likely that the hardware has degenerated and needs repairing. If you don't address this issue, it could result in costly repairs. If your exterior or internal bi fold doors are glazed or solid, they are susceptible to wear and tear. Regular maintenance can reduce the damage. Locks Bi fold doors are stunning and practical as a perfect addition to any home.