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FFU and Terminal Air Purification Equipment
Positive-Pressure HEPA Air Supply Unit
A portable duct-ready blower that draws source air through staged filtration and delivers HEPA-filtered air into a room to establish a controlled outward pressure bias.
- Filtered Supply Air
- Duct-Ready Positive Flow
- Variable EC Blower
- Sealed HEPA Final Stage
Product Introduction
The positive-pressure HEPA air supply unit is arranged with a protected intake, coarse prefilter, optional molecular stage, EC centrifugal blower and final HEPA cassette. Clean air exits through a sealed round supply collar that can connect to a temporary room, enclosure or clean booth. A variable-speed controller sets the delivered airflow, while a filter pressure gauge indicates increasing resistance. Because the unit adds filtered air rather than exhausting room air, pressure is established only when the served enclosure and relief path are appropriately sized.
Key Features
The final HEPA stage is positioned downstream of the blower to capture particles released inside the unit.
Variable EC drive allows the supply volume to be matched to leakage and relief airflow.
A differential-pressure gauge provides a visible indication of combined filter loading.
Customer Product Concerns
A temporary clean enclosure needs controlled filtered make-up air, not merely room-air recirculation, to maintain outward leakage at openings.
A recirculating purifier reduces particles but does not add enough air to create positive pressure.The ducted outlet supplies HEPA-filtered air from outside the served enclosure.
Leakage varies when doors, cable openings or softwall panels move.Variable fan control allows the supply flow to be adjusted to the actual leakage path.
Particles from a fan or internal cabinet surface can enter the protected space.The downstream HEPA cassette filters the complete airflow immediately before discharge.
Operators cannot see when accumulated dust is reducing the delivered airflow.A filter pressure indicator shows the resistance trend across the installed stages.
Typical Applications
Temporary positive-pressure cleanroomsPortable inspection enclosuresClean construction zonesSensitive equipment protectionEmergency clean-air supply
Technical Parameters
Typical construction ranges for a portable positive-pressure HEPA supply unit are shown below.
| Core Material | EC centrifugal blower with prefilter, optional carbon stage and downstream micro-glass H13-H14 HEPA filter |
|---|---|
| Panel Thickness | 450-800 mm enclosure depth |
| Effective Width | 500-900 mm cabinet width |
| Maximum Length | Up to 1200 mm overall unit height including caster base |
| Steel Facing Thickness | 1.0-1.5 mm powder-coated steel or 304 stainless-steel pressure enclosure |
| Core Density | Approximately 90-120 kg/m³ compacted density of the HEPA pack used in the positive-pressure supply unit |
| Thermal Conductivity | Approximately 0.035-0.043 W/(m·K) for the HEPA pack used in the positive-pressure air supply path |
| Surface Finish | Cleanroom-white powder coat with blue supply collar, stainless handles and non-marking casters |
| Joint Type | Gasketed filter tracks with clamped access door and sealed round or rectangular clean-air supply flange |
| Customization | Available based on the intended application and operating environment. |
Available Options
Round or rectangular supply connectionHEPA H13 or H14 final stagePrefilter and carbon configurationsCaster-mounted or stationary base
Planning a Positive-Pressure HEPA Air Supply Unit specification?
Send us your dimensions, installation conditions, performance targets and required surface finish.
