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FFU and Terminal Air Purification Equipment
Low-Profile Fan Filter Unit
An ultra-shallow FFU that recesses a flat EC impeller into the plenum to provide final filtration where the ceiling void cannot accept a conventional module.
- Approximately 206 mm Housing Depth
- Recessed Flat EC Impeller
- Reduced Ceiling-Void Requirement
- Full-Size Filter Face
Product Introduction
The low-profile fan filter unit reduces overall height by recessing a broad EC impeller and compact inlet bell into the shallow pressure chamber. The full ceiling footprint is retained, so the final-filter face does not need to shrink with the housing depth. Folded edge channels stiffen the thin casing, and side-mounted electrical access avoids adding equipment above the unit. This construction is intended for renovations, mezzanines and equipment mini-environments where structural beams or services leave little space above the cleanroom ceiling.
Key Features
Folded perimeter channels limit panel vibration without a tall external reinforcing frame.
The side-access controller can be reached within a narrow ceiling void without removing the fan assembly.
A full-area mini-pleat filter preserves a broad low-velocity outlet despite the compact casing.
Customer Product Concerns
When ceiling height is restricted, the FFU must become shallower without sacrificing filter area, access or uniform outlet velocity.
A conventional 350 mm deep FFU conflicts with cable trays, sprinklers or roof framing above the cleanroom.The recessed fan architecture reduces module depth to approximately 206 mm while retaining the ceiling footprint.
A small high-speed fan fitted into a shallow box creates a concentrated jet and visible diffuser hot spots.A broad low-profile impeller and shallow distribution baffles spread air before it reaches the filter face.
Top-mounted control boxes consume the clearance gained by specifying a shallow FFU.Electrical service hardware is arranged within the side envelope rather than stacked above the inlet.
Thin sheet panels can resonate and transmit fan vibration into the ceiling grid.Folded side rails and elastomeric motor supports stiffen the housing and interrupt vibration paths.
Typical Applications
Cleanroom retrofits below structural beamsFacilities with congested ceiling servicesLow-headroom laboratory suitesCompact equipment mini-environmentsModular cleanrooms beneath mezzanines
Technical Parameters
Typical construction ranges for an ultra-shallow low-profile fan filter unit are listed below.
| Core Material | Powder-coated steel plenum, recessed backward-curved EC impeller and micro-glass HEPA or ULPA filter pack |
|---|---|
| Panel Thickness | 190-260 mm overall module depth; approximately 206 mm is a common compact configuration |
| Effective Width | 532-1132 mm manufactured module width |
| Maximum Length | Up to 1132 mm standard module length |
| Steel Facing Thickness | 0.8-1.0 mm folded galvanized-steel housing sheet |
| Core Density | Approximately 85-115 kg/m³ nominal compacted density of the mini-pleat micro-glass filter pack |
| Thermal Conductivity | Approximately 0.035-0.043 W/(m·K) for the shallow mini-pleat pack used in the low-profile FFU |
| Surface Finish | White epoxy-polyester powder coating with blue-grey reinforced edge channels |
| Joint Type | Slim drop-in ceiling flange with continuous gasket and compression-sealed full-area filter frame |
| Customization | Available based on the intended application and operating environment. |
Available Options
Compact 2 × 2, 2 × 3 or 2 × 4 footprintSide-mounted or remote controllerCompact-depth H14 or U15 filter packRoom-side filter release for shallow ceiling voids
Planning a Low-Profile Fan Filter Unit specification?
Send us your dimensions, installation conditions, performance targets and required surface finish.
