Standardization of side curtain systems supplied for environmental control that use a barrier made from a flexible foil or fabric which moves via a rolling or folding action, or rigid panels that slide; as far as safety aspects, performance and sustainability issues are concerned. Included are machines that operate using the potential energy stored by the earlier application of human or animal force, such as stretched springs.
Excluded are doors and side curtains when used as doors, ventilation products inflated by air, screens supplied for the control of fire or smoke and screens that move instantaneously upon the application of human force.