The Original 40/4 stack chair, offered in joint partnership with OSI, is designed by David Rowland. It is the chair that paved the way for other high-density stack chair solutions to follow. The sleek design allows for stacking forty wood or steel chairs in a four foot envelope. The 40/4s versatile design and outstanding durability makes it an ideal solution for training rooms, classrooms, cafeterias and many other types of environments.