Patent attributes
The invention relates to a device (10) for controlling airflow (A) in a ventilation pipe (12) comprising one or several air throttle (32) which are synchronously actuated and prevent air flowing (A) in the air pipe in the closed position thereof. The ventilation pipe (12) is provided with a longitudinally extending fixing bar (16) which is arranged on a symmetry plane and provided with the pivot bearing (30) of an axis (28) for driving the air throttle(s) (32) and means (50, 52) for transmitting a force and/or torque to the drive axis (28) connected to the air throttle(s) (32). Said fixing bar (16) provided with different air throttles (12) is usable for the ventilation pipes having different cross sections and forms, an angle (β), preferably, ranging from 15° to 90°, with a longitudinal axis (L) or with a wall (18) of said ventilation pipe (12).
