This door operated by sliding it. The sliding wheel is supported by a system that can lift and down so that the wheels do not hold up the weight continuously, making the lift and slide the perfect slide door product. The extensive design gives its prestige and makes it sturdy. There's no vertical deflection when it made up to gives a sense of security when operated.
Contemporary and Colonial.
ASTM E331, ASTM E547, ASTM E283
EN 13126-16:2008, EN 13126-1:2012