A door unit that consists of either one or two pairs of doors that fold in half to open
A door that is hinged in the middle for openings into smaller closets.
A segmented, hinged door that folds into itself and slides on a head track to the side when opened. A typical 4-0, 5-0, or 6-0 door is made up of four door segments: two folding to the right and two to the left. This door was first used during the 19th century.
A segmented, hinged door that folds and slides on a head track to the side when opened. This door was first used during the 19th century and is now usually used for closet doors.