Greenheck has expanded its line of life safety dampers with the Model SMD-401EF smoke damper. Featuring an extruded aluminum frame and airfoil blades, Model SMD-401EF is available in sizes up to 192-in wide by 120-in high with a wide range of actuators in modulating or two-position operation. Model SMD-401EF is UL 555S Class I leakage certified and rated for velocities up to 3,000 fpm and pressures up to 6 in wg. for both horizontal and vertical installations.