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Cleanroom Air Distribution Systems
Constant Air Volume Controller
A self-powered duct regulator whose aerodynamic blade and calibrated spring mechanism hold a selected airflow across a defined pressure range.
- Pressure-Compensating Blade
- Adjustable Airflow Setpoint
- No External Control Power
- Supply or Extract Service
Product Introduction
The constant air volume controller uses the force acting on an aerodynamic blade to oppose a calibrated spring or bellows mechanism. As duct pressure rises, the blade moves toward the throttling position; as pressure falls, it opens to preserve the selected airflow. The setpoint is adjusted on an external scale without entering the air path. A rectangular flanged casing supports direct duct installation, while low-friction bearings and an accessible mechanism allow stable movement through the working pressure range.
Key Features
An external scale allows the nominal volume-flow setting to be changed after the duct is installed.
Low-friction bearings and a protected spring mechanism promote repeatable response at modest differential pressure.
Optional acoustic treatment and a downstream silencer reduce regenerated noise where the regulator absorbs a large pressure difference.
Customer Product Concerns
Reliable constant-volume operation requires sufficient differential pressure, uniform inlet airflow and an adjustment range that matches the actual branch duty.
Branch airflow increases whenever the main duct pressure rises.The pressure-responsive blade closes proportionally to absorb the additional pressure and stabilize the set volume.
A regulator selected below its minimum operating pressure never reaches the scheduled airflow.The controller size and setpoint are matched to the available branch pressure over the fan operating range.
An elbow directly at the inlet creates a biased velocity profile and unstable blade motion.A straight approach or suitable flow-straightening section presents the controller with a more even face velocity.
Throttling noise becomes objectionable above a ceiling near quiet work areas.A larger controller, acoustic casing or matched secondary silencer reduces local velocity and regenerated sound.
Typical Applications
Cleanroom constant make-up air branchesLaboratory general exhaustHospital room ventilationToilet and utility extract systemsConstant-volume process support areas
Technical Parameters
Representative construction data for a rectangular mechanical CAV controller are shown below.
| Core Material | Galvanized-steel aerodynamic control blade with stainless spring element and low-friction polymer bearings |
|---|---|
| Panel Thickness | 0.8–1.2 mm control blade and casing sheet |
| Effective Width | 200–1000 mm nominal rectangular duct width |
| Maximum Length | Up to 800 mm casing length in the airflow direction with acoustic section |
| Steel Facing Thickness | 0.8–1.0 mm galvanized external casing and flanges |
| Core Density | Approximately 7850 kg/m³ for the steel blade material |
| Thermal Conductivity | Approximately 50 W/(m·K) through the galvanized aerodynamic control blade |
| Surface Finish | Mill-galvanized casing with corrosion-protected adjustment hardware |
| Joint Type | Flanged rectangular casing with internally pivoted blade and external calibrated setpoint mechanism |
| Customization | Available based on the intended application and operating environment. |
Available Options
Multiple factory airflow rangesAcoustic casing and secondary silencerSupply-air or extract-air calibrationPowder-coated or stainless-steel casing
Planning a Constant Air Volume Controller specification?
Send us your dimensions, installation conditions, performance targets and required surface finish.
