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CLEANROOM AIR FILTRATION
Cleanroom Fan Filter Unit (FFU) with HEPA
Biogreen manufactures fan filter units for cleanrooms, controlled environments and process equipment requiring localized HEPA or ULPA filtration. Our cleanroom FFU configurations can be supplied with AC or energy-efficient EC motors, adjustable airflow, multiple housing materials and room-side replaceable filter designs.
Standard and custom sizes are available for modular cleanrooms, pharmaceutical facilities, electronics manufacturing, laboratories and other controlled environments.
H13 / H14 / ULPA
AC / EC Motor
Model-Dependent Airflow
Custom Dimensions
What Is a Fan Filter Unit and How Does It Work?
A fan filter unit combines a powered fan with a high-efficiency final filter in one ceiling-mounted or equipment-integrated assembly.
Air is drawn into the FFU by the fan, pushed through an H13/H14 HEPA or ULPA filter, and supplied into the controlled space as filtered air. Because each unit has its own fan, multiple FFUs can be distributed across a cleanroom ceiling and adjusted according to the required airflow pattern and clean zone layout.
In a complete cleanroom HVAC design, FFUs normally work together with make-up air, return-air paths, room pressure control and environmental conditioning rather than operating as a standalone ventilation system.
System Note
An FFU supplies filtered airflow. Room temperature, humidity and pressure relationships depend on the complete HVAC and air-balance design.
Inside a Cleanroom FFU
01 — Centrifugal Fan
Moves air through the filter while maintaining stable airflow.
02 — EC or AC Motor
Motor configuration can be selected according to control and energy requirements.
03 — Pre-filter
Helps reduce larger particulate loading before air reaches the final filter.
04 — HEPA / ULPA Filter
Available according to project filtration and cleanliness requirements.
05 — FFU Housing
Powder-coated steel, galvanized steel or stainless-steel options can be configured.
06 — Control Interface
Manual speed control or centralized communication options can be configured depending on the system.
Component selection should be confirmed against the required airflow, filter resistance, installation method and maintenance strategy.
Fan Filter Unit Size Options for Different Cleanroom Requirements
Compact Size
FFU-01
Compact fan filter unit for small clean zones, modular ceilings and localized airflow coverage.
- Outer Size: 575 × 575 × 310 mm
- Filter Size: 570 × 570 × 70 mm
- Rated Airflow: 500 m³/h
- AC Power: 180 W | DC Power: 150 W
1000 m³/h
FFU-02
Rectangular FFU configuration for modular cleanroom ceiling systems and general cleanroom applications.
- Outer Size: 1175 × 575 × 310 mm
- Filter Size: 1175 × 570 × 70 mm
- Rated Airflow: 1000 m³/h
- AC Power: 180 W | DC Power: 150 W
2000 m³/h
FFU-03
Large-capacity FFU for wider ceiling coverage and higher airflow demand in larger cleanroom areas.
- Outer Size: 1175 × 1175 × 365 mm
- Filter Size: 1170 × 1170 × 70 mm
- Rated Airflow: 2000 m³/h
- AC Power: 265 W | DC Power: 250 W
Shared Specifications：
Cleanliness: Class 100 · Filtration Efficiency: ≥99.99% (@ ≥0.3 μm) · Air Velocity: 0.45 m/s ±20% · Noise: ≤65 dB
Housing: Aluminum-Zinc Coated Steel or Stainless Steel · Motor: AC or DC · Control: Single Control, Touch Screen / Small-Group Control, or Computer Group Control · Power Supply: AC220 V, 50 Hz
HEPA and ULPA Filter Options
Filter selection should be based on the required cleanliness level, process risk, airflow resistance and cleanroom qualification strategy rather than efficiency percentage alone.
Biogreen FFUs can be configured with HEPA or ULPA final filters according to project requirements.
H13 HEPA
Suitable for many high-efficiency clean-air applications where the project specification calls for H13 filtration.
H14 HEPA
Frequently specified for higher-control cleanroom applications where the project requires H14 final filtration.
ULPA
Available where more demanding particle-control requirements justify the additional filter resistance and system design considerations.
Final filter grade, test method, seal type and replacement method should be confirmed in the approved project specification.
EC FFU for Adjustable and Efficient Cleanroom Airflow
An EC FFU uses an electronically commutated motor rather than a conventional fixed-control fan arrangement. The main advantage is not simply lower power consumption; it is the ability to match fan output more closely to actual airflow requirements.
In cleanrooms containing dozens or hundreds of FFUs, centralized speed control can help engineers balance airflow, compensate for filter loading and adapt operating conditions without manually adjusting every unit.
Variable Airflow
Adapt fan output to system requirements.
System Control
Optional centralized communication can be configured for multi-FFU installations.
Airflow Balancing
Supports adjustment across larger FFU ceiling arrays.
Energy Management
Helps avoid unnecessarily operating every unit at maximum output when the system design allows lower fan demand.
Fan Filter Unit Technical Specifications
The table below is a configuration framework for product selection. Final airflow, power, noise, dimensions and filter performance must be confirmed for the selected model and project conditions.
Parameter
Standard / Typical
Available Options
Nominal Size
575 × 575 / 1175 × 575 / 1175 × 1175 mm
Custom dimensions
Airflow
Model dependent
Custom selection
Face Velocity
Project/design dependent
Adjustable according to model
Final Filter
HEPA
H13 / H14 / ULPA
Motor
AC
EC
Housing
Coated steel
Galvanized steel / SUS304
Power Supply
Project dependent
110 V / 220–240 V where available
Speed Control
Manual
Multi-speed / centralized control
Installation
Ceiling mounted
Equipment integration / custom
Filter Replacement
Standard service
Room-side replaceable option
Communication
Model dependent
RS485 or project-specific option where available
Noise
Model dependent
Confirm at required airflow and test condition
How to Select a Fan Filter Unit for Your Cleanroom
01 — Cleanliness Requirement
Determine the required cleanroom classification and process sensitivity.
02 — Room Dimensions
Confirm room volume, usable ceiling area and grid module.
03 — Required Airflow
Define supply airflow as part of the complete cleanroom HVAC concept rather than selecting FFUs by room area alone.
04 — Filter Grade
Choose HEPA or ULPA according to contamination-control and project requirements.
05 — Motor & Control
Select AC, EC or centralized control according to system size and operating strategy.
06 — Maintenance Access
Determine whether standard or room-side replaceable construction is more suitable.
Cleanroom FFU Applications
Semiconductor
Distributed FFU ceiling systems and localized clean zones for particle-sensitive production.
Pharmaceutical
Controlled manufacturing and support areas requiring specified filtration and maintainable cleanroom systems.
Medical Device
Clean assembly and controlled production spaces with defined cleanliness requirements.
Electronics
Particle-sensitive manufacturing processes that benefit from localized filtered airflow.
Laboratory
Controlled research areas and clean zones requiring compact high-efficiency air filtration.
Battery Manufacturing
Clean and controlled production environments where particulate control is part of the process strategy.
Advantages and Limitations of Cleanroom FFU Systems
Advantages
ADVANTAGE — Modular Airflow
FFUs can be distributed according to clean-zone and ceiling-layout requirements.
ADVANTAGE — Flexible Expansion
Additional ceiling positions can be considered during future cleanroom modifications when the original system design allows it.
ADVANTAGE — Independent Fan Control
Individual or grouped airflow adjustment is possible depending on the selected control system.
ADVANTAGE — Simplified Air Distribution
In suitable system designs, FFUs can reduce dependence on extensive terminal duct distribution across the cleanroom ceiling.
Design Considerations / Limitations
LIMITATION — More Electrical Points
Large FFU arrays require coordinated power distribution and controls.
LIMITATION — Maintenance Quantity
More FFUs mean more motors, filters and control components to monitor over the facility lifecycle.
LIMITATION — Ceiling Access
Standard constructions may require plenum-side access for certain maintenance activities.
LIMITATION — Not a Complete HVAC System
FFUs do not independently control temperature, humidity, outdoor air or room pressure.
Fan Filter Unit FAQ
A fan filter unit is a self-contained air-filtration assembly that combines a fan, housing and HEPA or ULPA final filter. It is commonly installed in cleanroom ceilings or integrated into controlled process equipment to provide filtered supply air.
A HEPA filter is the filtration element. An FFU is the complete powered assembly that uses a fan to move air through the filter and deliver filtered air into the controlled space.
AC and EC refer to the motor/control approach. EC FFUs are commonly selected when variable speed, centralized control and system-level airflow adjustment are important. The correct choice depends on system size, control strategy and project economics.
It is an FFU designed so specified service components can be accessed from the cleanroom side. Depending on the model, room-side serviceability may apply to the filter only or to additional fan/motor components.
FFU quantity depends on room volume, required supply airflow, ceiling coverage, cleanliness target, process conditions, heat load, return-air strategy and the complete HVAC design. It should not be selected from a single universal units-per-square-meter rule.
An FFU contributes supply airflow, but room pressure is determined by the balance between supply, return and exhaust air. Pressure control should be designed at the complete room or HVAC-system level.
Choose the final filter according to the project specification, contamination-control strategy, required performance, test method and acceptable system resistance. A higher filter grade is not automatically the best choice for every application.
Biogreen can evaluate custom dimensions, housing materials, motor configurations, filter grades, controls and ceiling-integration requirements according to the project and selected product platform.
Need Help Selecting a Cleanroom FFU?
Send us your room dimensions, target cleanliness level, ceiling layout and required airflow information. Our team can recommend the FFU size, quantity, filter grade and control configuration for your project.
