Shut-off fire dampers FDA-BU-KN series, used in general ventilation systems as protection against penetration of smoke and fire between separated adjacent fire zones. The fire damper is available in Ø 100, 125, 160, and 200 mm. The shut-off fire dampers can be used for passage of ventilation systems through vertical and horizontal building partitions, providing fire tightness class E, fire insulation class I, smoke tightness class S of: FDA-BU-KN EI 120 (ve ho i↔o) S (300 Pa)
The damper is closed automatically as a result of temperature increase to of about 72˚C by breaking the fusible release. The released partition closes immediately. The fire dampers can be fitted with one or two limit switches to indicate the closed position of one or two damper blades.
