Motorized Smoke Damper, Shape Round, Actual Damper Sz. Dia. 5-7/8", Material Galvanized Steel, Frame 20 ga., Blade 14 ga., Max. Temp. 350 Degrees F, Max. Velocity 3000 fpm, Pressure Differential Max. 4" wg, Seals Silicone Rubber, Voltage 120, Hz 60, Phase 1, Free Area 23.04 sq. in., Nominal Duct Dia. 6", Depth 8-1/4", Mounting Type Vertical/Horizontal, Standards UL Standard 555S, NFPA 92A, 92B, 101 and 105, IBC, CSFM, NYC MEA, Class II Leakage, Includes Factory Mounted Actuator.WARNING: California ResidentsThis product can expose you to chemicals including Styrene, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.