Roller Curtain Door

A large metallic or nonmetallic closure used to close the opening in a hangar, building, warehouse, and the like to exclude light and wind, maintain reasonable weather tightness, and provide auxiliary access to areas outside the area proper. It is comprised of horizontal interlocking slats and guided at the ends by channel tracks. The item may be designed for rolling on a spring counterbalanced drum or be laterally guided by channel tracks. It may be power or hand operated and may include a hood or cover for the roller drum mechanism.