Flow Regulators

Inlet regulators adjust the flow rate of centrifugal fans to adapt them to the different operating conditions of the system. Managing the flow rate using a simple damper is a low-cost method but quite inefficient in terms of energy consumption. Inlet flow regulators are much more effective as the correct configuration of the adjustable blades reduces pressure losses and, consequently, the impact on the fan's aeraulic characteristics at the impeller inlet. As previously mentioned, these should be installed in the inlet, and to reduce pressure loss, it is recommended to install a protected inlet nozzle. Alternatively, the direction of the pre-swirl should always be positioned in the direction of the fan's rotation.

Compared to dampers, regulators provide better control. Depending on the position of the blades, the regulator generates a pre-swirl with changes in the performance curves of the fans. The power required by the fan can be adjusted by varying the blade inclination angle. The direction of the pre-swirl must always be the same as the fan's rotation direction.