scope:

NOTE:

This specification covers the requirements for commercial aluminum curtain walls designed to accommodate fixed-glass lights, window sashes, panels, louvers, and other curtain-wall accessories Curtain-wall systems may be classified by visual characteristics as follows:

Mullion type has dominant vertical lines. Vertical mullions are usually 45 millimeter 1-3/4 inches or more wide and usually extend 100 millimeter 4 inches or more beyond the exterior face of the curtain wall. Mullions are usually not more than 1525 millimeter 5 feet on center.

Grid type has equally dominant vertical and horizontal lines. Vertical and horizontal mullions are usually 45 millimeter 1-3/4 inches or more wide and usually extend 100 millimeter 4 inches or more beyond the exterior face of the curtain wall. The area enclosed by the mullions is usually not more than 3 square meter 32 square feet.

Spandrel type has dominant horizontal lines, and the supports are not a primary element of expression.

The sheathed type has a nonlinear pattern, and the supports are not a primary element of expression.