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Systèmes de distribution d'air Cleanroom
Boîte terminale à volume d'air constant
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
Introduction de produit
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.
Préoccupations du client produit
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.
Les applications typiques
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
Paramètres techniques
Representative construction ranges for a single-duct cleanroom constant-volume terminal are shown below.
| Matériaux de base | Galvanized-steel casing with steel damper blade, aluminum flow pickup and external control assembly |
|---|---|
| Panneau épaisseur | 0.8–1.2 mm galvanized casing panels |
| Largeur effective | 200–800 mm rectangular discharge width |
| Longueur maximale | Up to 1200 mm including optional attenuator or reheat section |
| Acier face épaisseur | 0.8–1.2 mm galvanized sheet-steel casing |
| Densité Core | Approximately 7850 kg/m³ for the steel casing and damper components |
| Conductivité thermique | Approximately 45–60 W/(m·K) for the steel casing and damper components |
| surface finie | Clean mill-galvanized casing with optional white powder-coated exterior |
| Type joint | Round beaded inlet collar and rectangular slip-and-drive discharge connection |
| Customisation | Disponible en fonction de l'application prévue et de l'environnement d'exploitation. |
Options disponibles
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?
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