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Cleanroom HVAC and Air Handling Equipment
Centrifugal Cleanroom Exhaust-Air Fan Unit
A sealed inline cabinet fan that uses a backward-curved centrifugal wheel to maintain exhaust flow and negative pressure for controlled cleanroom processes.
- Stable Negative-Pressure Exhaust
- Sealed Service Cabinet
- Backward-Curved Centrifugal Wheel
- Isolated Inline Installation
Product Introduction
The cleanroom exhaust-air fan unit encloses a centrifugal wheel, motor, isolation base and pressure connections in a gasketed steel cabinet. Its backward-curved impeller develops the static pressure needed for terminal filters, control dampers and long duct routes while keeping the motor accessible from the side. A direct-drive EC or belt-drive arrangement can be selected to match airflow range, service policy and discharge temperature.
Key Features
Gasketed access panels limit uncontrolled air leakage that would otherwise reduce extraction at the room terminal.
An isolated motor and wheel assembly prevents rotating vibration from entering the exhaust duct and building structure.
Pressure taps and speed control allow the fan to maintain duct suction as filters or dampers change resistance.
Customer Product Concerns
Containment exhaust must maintain reliable suction through changing filter resistance without leaking contaminated air into the technical space.
Exhaust flow falls as a terminal filter loads, weakening the room pressure cascade.A duct-pressure controller increases fan speed within the available motor and wheel operating envelope.
A poorly sealed cabinet draws plantroom air into the duct and masks low capture at the room inlet.Continuous panel gaskets and sealed cable penetrations keep measured fan flow representative of actual room extraction.
Deposits on the wheel cannot be inspected without removing connected ductwork.A full-height side door exposes the wheel, inlet cone and motor while the inlet and discharge collars remain connected.
Fan vibration creates nuisance noise and can loosen nearby duct joints.Internal isolation mounts and external flexible connectors decouple the rotating assembly from the casing and duct.
Typical Applications
Negative-pressure pharmaceutical processing roomsLaboratory extract and containment branchesCleanroom equipment and enclosure exhaustMedical isolation support ventilationFiltered exhaust from powder-handling areas
Technical Parameters
Typical structural ranges for an insulated centrifugal cleanroom exhaust-air fan cabinet are listed below.
| Core Material | Backward-curved aluminum or coated-steel wheel in a mineral-wool-lined galvanized steel exhaust cabinet |
|---|---|
| Panel Thickness | 25-50 mm insulated double-skin cabinet panel thickness |
| Effective Width | 500-1800 mm nominal exhaust-fan cabinet width |
| Maximum Length | Up to 2400 mm overall cabinet length including inlet and discharge collars |
| Steel Facing Thickness | 0.8-1.5 mm galvanized or coated steel casing sheet |
| Core Density | 40-80 kg/m³ typical mineral-wool acoustic and thermal lining density |
| Thermal Conductivity | Approximately 0.035-0.045 W/(m·K) for mineral-wool cabinet lining |
| Surface Finish | White powder-coated exterior with blue gasketed service door and corrosion-resistant internal surfaces |
| Joint Type | Bolted sealed cabinet with flanged duct collars, flexible connectors and vibration-isolated fan base |
| Customization | Available based on the intended application and operating environment. |
Available Options
Direct-drive EC or belt-drive centrifugal fanCoated aluminum all-stainless or FRP-contact constructionConstant-suction control and remote run-fault contactsUpstream filter housing and duty-standby fan arrangement
Planning a Centrifugal Cleanroom Exhaust-Air Fan Unit specification?
Send us your dimensions, installation conditions, performance targets and required surface finish.
