CHARACTERISTICS: Hybrid volume control dampers 100 mm pitch. DESCRIPTION: SRC-FA-C: opposed blade damper with manual control. SRC-FA-P: opposed blade damper with pin for servo-motor (standard). CONSTRUCTION: Galvanized steel frame Extruded aluminium blades Nylon spindles. FIXING: By bolts on flanges corners. DETAILS: Drive: Counter rotating movement driven by manual control or servomotor.