https://trade-britanica.trade/....wiki/BiFold_Door_Rep
Bifold Door Seal Repair The bifold door is a great addition to any home However, it requires proper installation and maintenance in order to function properly. This includes a thorough examination of the lubrication system, as well as an assessment of any issues that could arise in the future. Bifold doors are designed to be slightly smaller than their frames to reduce sticking. However, this could result in air leakage through the gap. Install a weather seal to fix this problem. Da