Steel 2-Way Register, Multi-Shutter Dampier, 1/2" Fin Spacing All-steel construction (682) Aluminum construction (A682) Used for ceiling or sidewall installations Ideal for shallow duct installations Two-way deflection 1/2" spaced fins set at 40 degrees Multi-shutter valve 1 5/8" depth when fully opened Interlocking valve louvers for positive shut-off Bright White finish Available with fusible link option, limited sizes (not UL-listed or fire-rated)