Cleanroom Air Distribution Systems

Motorized Volume Control Damper

An actuator-driven airfoil damper that modulates rectangular duct airflow from an external control signal and closes against perimeter seals.

Direct-Coupled Electric Actuator
Low-Leakage Airfoil Blades
Modulating or On-Off Control
External Position Indication

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Product Introduction

The motorized volume control damper uses linked hollow airfoil blades to regulate airflow with less turbulence than formed single-skin blades at high velocity. A direct-coupled electric actuator mounts on the extended drive shaft and moves the opposed blade bank in response to an on-off, floating or proportional signal. Tip and jamb seals reduce closed-position leakage, while enclosed gears or linkage keep the mechanism synchronized. The actuator remains outside the duct for wiring, manual override and position inspection.

Key Features

Extruded or fabricated airfoil blades reduce pressure loss and regenerated sound in modulating service.

A direct-coupled actuator eliminates crank-arm backlash and transmits torque directly to the drive shaft.

Blade-tip and jamb seals improve shut-off during unoccupied, purge or equipment-isolation sequences.

External position indication and optional auxiliary switches provide visible and electrical proof of travel.

Customer Product Concerns

Automatic duct control requires adequate actuator torque, stable blade synchronization and a control signal that matches the desired fail position and modulation sequence.

An undersized actuator stalls before the sealed blades reach full closure.Blade area, differential pressure, seal friction and linkage arrangement are included in the torque selection.

Loose external crank arms introduce deadband around the commanded position.A rigid direct-coupled shaft connection reduces lost motion between the actuator and blade bank.

Uneven linkage travel leaves several blades partly open during shutdown.Geared or positively linked blades maintain synchronized rotation across the complete frame.

A power interruption leaves a critical exhaust branch in the wrong position.A spring-return actuator drives the damper to the selected normally open or normally closed safety position.

Typical Applications

Automatic cleanroom supply controlAir-handler mixing and bypass sectionsLaboratory exhaust modulationOutside-air and return-air sequencingProcess ventilation zone control

Technical Parameters

Representative construction ranges for an airfoil-blade motorized rectangular damper are shown below.

Core Material	Extruded aluminum airfoil blades with elastomer tip seals, galvanized frame and steel drive shaft
Panel Thickness	20–35 mm hollow airfoil blade depth
Effective Width	150–1500 mm nominal single-section airway width
Maximum Length	Up to 1800 mm single-section frame height
Steel Facing Thickness	1.2–1.5 mm galvanized frame and actuator mounting plate
Core Density	Approximately 2700 kg/m³ for the aluminum blade material
Thermal Conductivity	Approximately 160–205 W/(m·K) for the aluminum airfoil sections
Surface Finish	Natural aluminum blades with galvanized or powder-coated frame and protected actuator bracket
Joint Type	Flanged frame with geared opposed blades, perimeter seals and direct-coupled external actuator
Customization	Available based on the intended application and operating environment.

Available Options

24 V or 230 V actuator supplyOn-off, floating or 0–10 V modulationSpring-return or non-spring-return driveAuxiliary switches and weather-resistant actuator enclosure

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