Schweiss Doors is the leader in the manufacturing of bifold doors with Lift Straps and One Piece hydraulic doors for the avia ... tion, agricultural, commercial, industrial and residential industries. Schweiss doors can be found world wide on aircraft hangars, farm shops, commercial buildings and residences. Whether it's a bifold door featuring our patented “Lift Straps” or our new “Red Power” hydraulic doors, Schweiss is the company to choose for a strong, safe and reliable door. Learn more at www.schweissdoors.com. read more