CHARACTERISTICS: Shut-off damper leakage 100 mm pitch certified class 4 according to EN 1751. ARTICLE DESCRIPTION: SRCT-P : opposed blade damper with pin for servo-motor (standard). SRCT -C: opposed blade damper with manual control. CONSTRUCTION: Galvanized steel frame. Extruded aluminium gears. Gears of rotation in plastic material. FIXING: By bolts on flanges corners. DETAILS: Drive: Counter rotating movement driven by manual control or servomotor.