Pass ISO9001-2000 quality certificate, supply motorized damper, air duct damper, volume damper, air tubing, air grille, diffuser Motorized Air DamperFeature: 1. For HVAC system, especially for Chemical Ventilation System's Air Volume Control;2. Use ABS plastic as material, Duct Diameter is 150MM;3. Fire-resistance and airproof performance;4. Motor Powre is 6W; Motorized Damper