Hi-Fold Door Corporation's farm and agriculture equipment includes bi-fold high clearance doors and airplane hangar doors.You won't go wrong with quality-built Hi-Fold Doors! They're the only bi-fold doors with high-clearance advantages, requiring less overhead space. Made of heavy-duty steel tubing in sizes up to 70-feet wide and 20-feet high, their rugged, all-welded construction prepares them for many years of day-in and day-out use with minimum maintenance. Cost-saving, standard bi-folds are also available for installations where Hi-Fold advantages are not required. A dependable, three year warranty covers all materials and workmanship.