Shutters ~ horizontal folding shutters are similar in operation to
sliding/folding doors but are composed of smaller leaves and
present the same problems. Roller shutters however do not occupy
any wall space but usually have to be fully opened for access.
They can be manually operated by means of a pole when the
shutters are self coiling, operated by means of an endless chain
winding gear or mechanically raised and lowered by an electric
motor but in all cases they are slow to open and close. Vision
panels cannot be incorporated in the roller shutter but it is
possible to include a small wicket gate or door in the design.
Industrial Doors