https://perfectworld.wiki/wiki..../How_To_Explain_Bifo
Bifold Door Seal Repair Bifold doors are a great addition to any home, but they require regular maintenance and proper installation for correct operation. This includes a thorough integrity check and lubrication, as well as a review of any issues to avoid them in the future. To minimise sticking, bifold doors are designed to be ever-so slightly smaller than the frame. However, this also means that air can enter through the gap. Install a weather seal to fix this problem. Seals that have been damaged A