Mechanical Constant Flow Damper adjust the required air flow rate mechanically by itself. It controls with its spring operated mechanism without adhering to any electrical power.
The controller operates from the minimum response pressure difference up to maximum pressure of 1000Pa and air velocity range 2 -10 m/s. Over this entire pressure range, the maximum flow rate deviation is +-10%. The required air flow rate can be changed via an allen wrench on the unit easily.