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FFU and Terminal Air Purification Equipment
Standard Fan Filter Unit
A self-contained ceiling module that combines a controllable blower, final filter and perforated diffuser to deliver uniform particle-controlled supply air.
- Integrated Blower and Final Filter
- Uniform Downward Air Pattern
- Modular Ceiling-Grid Format
- Top-Side Service Access
Product Introduction
The standard fan filter unit packages a backward-curved centrifugal blower, shallow pressure plenum, mini-pleat final filter and perforated diffuser in one ceiling-mounted housing. Air enters through the top prefilter, is distributed through the plenum and passes evenly across the full filter face before entering the clean zone. The drop-in perimeter is sized for common modular ceiling grids, while separate access to the fan and filter supports routine inspection without dismantling adjacent ceiling panels.
Key Features
Internal baffles distribute air across the mini-pleat pack instead of concentrating velocity directly below the fan inlet.
The perforated downstream face protects the filter media and moderates the outlet air pattern.
A gasketed ceiling flange limits bypass between the FFU frame and the supporting grid.
Customer Product Concerns
A standard FFU must provide repeatable clean air over a ceiling bay while remaining straightforward to install, balance and maintain.
A central fan jet creates high velocity in the middle and weak airflow near the filter corners.A formed pressure plenum and internal distribution baffle spread inlet air before it reaches the filter pack.
Air leaks around the module perimeter allow unfiltered ceiling-plenum air to enter the clean zone.A continuous closed-cell gasket seats against the ceiling grid and closes the perimeter bypass path.
Dust loading in a coarse prefilter shortens final-filter service life and raises fan power.A removable top intake prefilter captures larger debris before it reaches the high-efficiency media.
Different ceiling bays require inconsistent on-site adapters and leave uneven module spacing.Standardized square and rectangular footprints fit common cleanroom T-grid layouts with repeatable support points.
Typical Applications
Pharmaceutical cleanroom ceilingsElectronics assembly clean zonesMedical-device production suitesLaboratory preparation roomsModular hardwall and softwall cleanrooms
Technical Parameters
Typical construction ranges for a modular standard fan filter unit are listed below.
| Core Material | Powder-coated galvanized-steel plenum, backward-curved centrifugal fan and micro-glass HEPA or ULPA filter pack |
|---|---|
| Panel Thickness | 300-380 mm overall module depth |
| Effective Width | 575-1170 mm nominal ceiling-grid width |
| Maximum Length | Up to 1170 mm standard module length |
| Steel Facing Thickness | 0.8-1.0 mm formed galvanized-steel housing sheet |
| Core Density | Approximately 80-110 kg/m³ nominal compacted density of the mini-pleat micro-glass filter pack |
| Thermal Conductivity | Approximately 0.035-0.045 W/(m·K) for the dry mini-pleat micro-glass pack used in the standard FFU |
| Surface Finish | White epoxy-polyester powder coating with a white perforated downstream diffuser |
| Joint Type | Drop-in T-grid perimeter flange with a continuous ceiling gasket and sealed filter-to-housing interface |
| Customization | Available based on the intended application and operating environment. |
Available Options
575 × 575 mm or 575 × 1170 mm footprintH13 or H14 glass-fibre mini-pleat packTop-side fan access with optional clean-side filter releaseManual speed controller or group control interface
Planning a Standard Fan Filter Unit specification?
Send us your dimensions, installation conditions, performance targets and required surface finish.
