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Cleanroom Air Distribution Systems
Constant Air Volume Terminal Box
A single-duct terminal that measures primary airflow and positions an internal damper to maintain a fixed supply or extract volume as upstream pressure changes.
- Pressure-Independent Air Volume
- Integrated Flow Pickup
- Low-Leakage Damper
- Accessible Control Enclosure
Product Introduction
The constant air volume terminal box provides a defined air quantity to a cleanroom branch without requiring the main duct pressure to remain perfectly steady. A multi-point inlet sensor reads velocity pressure across the round connection, while a calibrated controller drives the internal damper to the scheduled setpoint. The rectangular galvanized-steel casing transitions directly to downstream ductwork and keeps the actuator, tubing and controller outside the primary airstream for inspection. Optional acoustic lining and discharge attenuator sections can control breakout and regenerated sound in ceiling voids.
Key Features
Closed-loop damper control maintains the selected air quantity through normal variations in system static pressure.
The external control enclosure leaves the actuator and pressure tubing reachable without opening the supply duct.
A rectangular slip-and-drive discharge connection simplifies transition to branch ductwork or a downstream reheat section.
Customer Product Concerns
A constant-volume branch must hold its scheduled flow despite filter loading and upstream pressure movement while remaining quiet and serviceable above the ceiling.
Branch airflow rises whenever the main supply fan increases static pressure.The flow sensor and modulating damper continuously correct the terminal opening to retain the programmed volume.
A poorly selected inlet size produces unstable readings at low cleanroom airflow.Multiple inlet diameters and calibrated pickup factors allow the sensor velocity to stay within a useful control range.
Damper-generated noise travels directly to a ceiling diffuser.A lined casing or downstream attenuator section absorbs regenerated sound before the branch enters the occupied space.
Controls cannot be inspected after adjacent ceiling services are installed.A side-mounted removable enclosure groups the actuator, controller and tubing in one visible service location.
Typical Applications
Constant supply airflow to clean production roomsFixed extract volume from pressure-controlled support spacesGowning-room ventilation branchesLaboratory make-up air terminalsMedical-device assembly HVAC zones
Technical Parameters
Representative construction ranges for a single-duct cleanroom constant-volume terminal are shown below.
| Core Material | Galvanized-steel casing with steel damper blade, aluminum flow pickup and external control assembly |
|---|---|
| Panel Thickness | 0.8–1.2 mm galvanized casing panels |
| Effective Width | 200–800 mm rectangular discharge width |
| Maximum Length | Up to 1200 mm including optional attenuator or reheat section |
| Steel Facing Thickness | 0.8–1.2 mm galvanized sheet-steel casing |
| Core Density | Approximately 7850 kg/m³ for the steel casing and damper components |
| Thermal Conductivity | Approximately 45–60 W/(m·K) for the steel casing and damper components |
| Surface Finish | Clean mill-galvanized casing with optional white powder-coated exterior |
| Joint Type | Round beaded inlet collar and rectangular slip-and-drive discharge connection |
| Customization | Available based on the intended application and operating environment. |
Available Options
Pressure-independent digital or analog controlsFactory-set constant-volume mechanical controlInternal acoustic liner or integral silencerHot-water or electric reheat section
Planning a Constant Air Volume Terminal Box specification?
Send us your dimensions, installation conditions, performance targets and required surface finish.
