CEMCO Deflection Drift Angle (DDA) is a composite steel angle with intumescent tape factory applied to the inside leg of the steel angle, the CEMCO DDA is a fire-rated accessory that when combined with the CEMCO Slotted Track will offer unencumbered movement at the head-of-wall joint in accordance with the UL-2079 “Test for Fire Resistance of Building Joint Systems”. The 2-1/2 inch outside leg is manufactured in red steel and labeled for proper identification.