Key features: 1.Airfoil blades with various material options 2.Robust, performance oriented 3.Nfpa, ul555 compliant 4.Various actuators options available Key features: 1.Maximum pressure: 12 ~ 24 in wc 2.Velocity: 20.3 m/s 3.Leakage: 8 cfm/sq. Ft. , 4 in. Wc 4.Blade deflection: l/180 (standard) 5.Blade profile: fabricated airfoil / extruded airfoil / fire rated airfoil 6.Blade material: galvanized steel / aluminum / ss 304 / ss 316 7.Certifications: nfpa 130, 502; ul 555s; bs476 Typical ventilation applications area include: 1.Subway ventilation system 2.Tunnel ventilation / control system 3.Underground ventilation system