Fan Filter Unit Manufacturer

Clean-Link manufactures and supplies fan filter units (FFUs) for cleanrooms, semiconductor facilities, electronics manufacturing, pharmaceutical environments, laboratories, controlled production spaces, and OEM clean-air systems.

An FFU combines a fan, high-efficiency filter, housing, and control components into a compact ceiling or terminal filtration module. Selecting the right unit requires more than choosing the outside size. Airflow, filter class, pressure drop, motor type, noise level, ceiling-grid compatibility, power supply, filter replacement method, and control requirements all need to be considered.

Clean-Link can support HEPA and ULPA filtration, project-specific dimensions, housing configurations, airflow requirements, variable-speed options, and OEM/project supply.

Planning an FFU project?
Start with Size + Airflow + Filter Class + Power Supply + Control Requirement + Quantity.

Request an FFU Quote →

Fan Filter Unit Solutions

HEPA Fan Filter Units

HEPA FFUs combine an integrated fan with a high-efficiency filter to provide filtered supply air directly into a controlled environment.

Typical project requirements may include:

• H13 HEPA filter
• H14 HEPA filter
• Mini-pleat filter construction
• Aluminum-frame filter
• Gasket or gel-seal design
• Custom airflow
• Variable-speed operation
• Ceiling-grid installation
• Project-specific control requirements

HEPA classification and testing should be confirmed according to the project specification.

ISO 29463-1:2024 provides the current international classification and performance framework for high-efficiency filters.

ULPA Fan Filter Units

For more demanding cleanroom and semiconductor applications, FFUs may be integrated with ULPA filters.

Possible requirements can include:

• U15
• U16
• Project-specific U17 requirements
• Mini-pleat ULPA media
• High media area
• Low-resistance design targets
• Cleanroom ceiling integration
• Individual filter testing requirements

ULPA should not automatically be selected simply because it provides a higher efficiency class.

The correct choice depends on:

• Cleanliness requirement
• Airflow
• Filter resistance
• FFU fan capability
• Ceiling coverage
• Process sensitivity
• Testing requirement

Related page: ULPA Filters →

 

Custom Fan Filter Units

Not every cleanroom project uses a standard FFU size or configuration.

Clean-Link can review custom FFU requirements based on:

• Length
• Width
• Height
• Required airflow
• Filter class
• Filter depth
• Housing material
• Ceiling-grid dimensions
• Electrical requirement
• Motor configuration
• Speed-control method
• Filter replacement direction
• Project quantity
• OEM requirements

Request Custom FFU Support →




What Is a Fan Filter Unit?

A fan filter unit is a self-contained air filtration module that typically combines:

• Fan or blower
• HEPA or ULPA filter
• Housing
• Air inlet
• Filter mounting system
• Speed or airflow control
• Electrical connection

FFUs are commonly installed in modular cleanroom ceilings to provide filtered supply air directly into the controlled space.

Unlike a passive terminal HEPA filter, an FFU includes its own fan.

This gives the unit the ability to generate airflow through the integrated high-efficiency filter rather than relying entirely on the central air-handling system.

Major cleanroom manufacturers such as Camfil, AAF, Terra Universal, and Price Industries all position FFUs as integrated fan-plus-filter modules for cleanroom or critical-environment applications. 

Why Use Fan Filter Units in a Cleanroom?

FFUs can provide flexibility in cleanroom airflow design because filtration and fan power are distributed across the ceiling rather than relying only on a central supply system.

Depending on the design, FFUs can support:

• Modular cleanroom ceilings
• Distributed clean-air supply
• Local airflow adjustment
• HEPA / ULPA final filtration
• Cleanroom expansion
• Different ceiling coverage ratios
• Zone-based airflow control
• Retrofit cleanroom projects

FFU systems are widely used in cleanrooms because airflow capacity can be distributed across many individual ceiling modules.

This is especially useful where cleanliness requirements vary by area or where the cleanroom needs future expansion flexibility.

HEPA vs ULPA FFU

One of the first decisions in an FFU project is the final filter class.

The highest efficiency is not automatically the best option.

A ULPA filter can create a different resistance profile from a HEPA filter, so fan selection and available static pressure need to be reviewed together.

FFU filter selection should balance efficiency, airflow and pressure drop—not efficiency alone.

H13 and H14 HEPA FFUs

H13 and H14 filters are commonly used in FFUs for cleanroom and controlled-environment applications.

The appropriate class depends on:

• Cleanroom requirement
• Process sensitivity
• Airflow
• Ceiling coverage
• Pressure drop
• Fan capability
• Filter integrity requirements
• Applicable project standard

A filter class does not by itself determine the cleanroom class.

Cleanroom performance also depends on:

• Air changes
• Airflow distribution
• Ceiling coverage
• Room leakage
• Particle generation
• Pressure relationships
• Process equipment
• Personnel activity

Related: HEPA Filter Manufacturer →

              Mini-Pleat HEPA Filters →

U15 / U16 / U17 FFU Options

ULPA FFUs may be specified for semiconductor, electronics and other highly sensitive processes.

Typical ULPA requirements may include:

• U15
• U16
• U17 where required
• MPPS-based efficiency
• Individual scan testing
• Low-outgassing media
• Membrane media requirements
• High media area
• Project-specific resistance target

AAF currently publishes FFU systems with HEPA/ULPA filtration and multiple control options, while Camfil also offers HEPA and ULPA FFU configurations.

Related: ULPA Filters →

Airflow Is a Core FFU Specification

FFU selection should start with required airflow.

Important data include:

• Airflow per FFU
• Room area
• Ceiling coverage
• Number of FFUs
• Filter face area
• Face velocity
• Required air-change rate
• Supply-air strategy

The required number of FFUs cannot be determined only from cleanroom floor area.

The cleanroom designer should also consider:

• Room height
• Heat load
• Process equipment
• Personnel
• Cleanliness target
• Recirculation strategy
• Ceiling layout

Clean-Link can review project airflow requirements together with FFU dimensions and filtration requirements.

Constant Airflow vs Variable-Speed FFUs

Different FFU control strategies can be used depending on the project.

Variable-Speed FFUs

Variable-speed operation allows airflow to be adjusted according to commissioning or operating requirements.

Potential benefits include:

• Airflow balancing
• Zone adjustment
• Commissioning flexibility
• Reduced airflow during selected operating periods
• Easier system tuning

Constant-Airflow Control

Some advanced FFU designs use feedback control to compensate for changes in static pressure or filter loading.

Terra Universal currently offers constant-airflow FFUs that automatically adjust output in response to changing system resistance.

For Clean-Link projects, control requirements should be specified in advance because motor/controller configuration affects electrical design and system integration.

EC vs AC Motor Options

Motor selection affects:

• Power consumption
• Speed control
• Noise
• Control compatibility
• System efficiency
• Maintenance strategy

EC Motors

Electronically commutated motors are widely used in modern cleanroom FFUs because they support efficient variable-speed operation and centralized control.

Camfil, AAF, Terra Universal, and Price Industries all prominently feature EC-based FFUs in their current cleanroom portfolios.

AC Motors

AC configurations may still be used in selected projects depending on:

• Existing electrical system
• Cost requirements
• Control architecture
• Replacement compatibility

Clean-Link can review the required motor configuration according to project needs.

Do not specify EC or AC based only on motor type—the required control method and airflow strategy should also be considered.

Noise Level

FFUs are often installed directly above occupied cleanroom spaces, so acoustic performance can matter.

Noise depends on:

• Fan speed
• Airflow
• External static pressure
• Filter resistance
• Unit size
• Fan design
• Ceiling installation
• Number of operating units

Competitors such as Camfil, Terra Universal, and Price explicitly position low sound output as an important FFU design consideration.

For projects with a specific sound requirement, the required test condition and sound limit should be stated in the RFQ.

Pressure Drop and Fan Capability

The FFU fan must overcome the resistance of the integrated filter.

That resistance depends on:

• HEPA / ULPA class
• Media type
• Media area
• Pleat geometry
• Filter depth
• Airflow
• Filter loading

As filters load with particles, resistance generally increases.

That means FFU selection should consider both:

Initial filter resistance
and
Expected resistance development during operation

A fan sized only for the clean filter condition may have less operating margin as filter resistance rises.

FFU performance depends on matching the fan and filter as one system.

FFU Dimensions and Ceiling Grid Compatibility

FFUs are commonly integrated into modular cleanroom ceiling grids.

Typical project considerations include:

• Module length and width
• Unit height
• Ceiling-grid opening
• Filter face dimensions
• Service clearance
• Electrical access
• Filter replacement access
• Diffuser or guard design

AAF currently lists several standard FFU sizes, including 2×2, 2×3, 2×4, 3×4 and 4×4 configurations, with custom sizes also available.

Clean-Link can review standard or custom dimensional requirements according to ceiling design and project layout.

For custom projects, provide:

Ceiling Grid Drawing + FFU Opening Size + Required Airflow + Quantity

Housing Material Options

FFU housing material should match the cleanroom environment and project requirements.

Possible options may include:

• Powder-coated steel
• Galvanized steel
• Aluminum
• Stainless steel

Selection depends on:

• Cleanroom application
• Corrosion environment
• Cleaning requirements
• Weight
• Ceiling structure
• Cost
• Pharmaceutical or process requirements

Camfil currently offers galvanized steel as standard on selected FFUs with stainless steel and aluminum options, while AAF lists aluminum and 304 stainless steel for its EC FFUs.

Clean-Link housing options should be confirmed according to the specific FFU configuration.

Top-Side vs Room-Side Filter Replacement

Maintenance access is an important FFU purchasing consideration.

Top-Side Replacement

The filter or unit is serviced from above the cleanroom ceiling.

This may be suitable where:

• Ceiling plenum access is available
• Maintenance personnel can access the upper service area
• Cleanroom interruption is acceptable

Room-Side Replacement

Room-side replaceable designs allow filter replacement from inside the controlled room.

This can be useful where:

• Ceiling plenum access is limited
• Large cleanroom arrays are installed
• Service access must remain inside the room
• Filter replacement needs to avoid major ceiling access

Camfil, AAF and Terra all currently offer configurations involving room-side replacement or room-side service access.

Replacement method should be specified during FFU selection because it affects housing, filter frame and sealing design.

Gasket Seal and Gel Seal FFUs

FFU filter sealing helps reduce bypass between the filter and housing.

Gasket Seal

Gasket-seal filters rely on controlled compression between the filter frame and housing.

Important factors include:

• Gasket position
• Compression
• Housing flatness
• Frame fit
• Installation consistency

Gel Seal

Some room-side-replaceable FFUs use gel-seal filters with a compatible knife-edge housing.

Terra Universal, for example, uses gel-filled channels in selected room-side-replaceable FFUs.

Clean-Link can review filter sealing according to the intended housing and replacement method.

Related: Gel-Seal HEPA Filters →

Individual FFU Control

For small cleanrooms, individual FFUs may use local speed adjustment.

Possible control approaches include:

• Manual speed control
• Local controller
• 0–10 V control
• Project-specific external control

This can allow commissioning teams to adjust airflow unit by unit.

Control interface requirements should be confirmed before production.

Centralized FFU Control

Large cleanrooms can contain dozens, hundreds, or even thousands of FFUs.

Centralized control may help operators:

• Start or stop units by zone
• Adjust fan speed
• Balance airflow
• Monitor operation
• Manage cleanroom pressure strategy
• Reduce airflow in selected operating modes
• Identify unit status

Current competitor platforms demonstrate several approaches: Camfil supports centralized control and interfaces such as Modbus, LON and 0–10 V on selected systems; AAF provides control consoles for integrated FFU management; Price offers BACnet-based monitoring on selected units. 

For Clean-Link projects, the desired control architecture should be provided during quotation.

FFUs for Semiconductor Cleanrooms

Semiconductor manufacturing is one of the most important FFU applications.

Typical uses include:

• Wafer fabs
• Lithography areas
• Microelectronics production
• Mini-environments
• Inspection zones
• Process-tool areas
• Controlled assembly spaces

These projects can require:

• High FFU ceiling coverage
• HEPA or ULPA filtration
• Low particle penetration
• Stable airflow
• Low resistance
• Centralized control
• Low-outgassing materials
• Clean packaging
• Project-specific testing

AAF and Camfil both position FFUs specifically for microelectronics and semiconductor cleanroom applications.

Related page: Semiconductor Air Filtration →




FFUs for Pharmaceutical Cleanrooms

FFUs can also be used in pharmaceutical and biotechnology cleanrooms.

Potential applications include:

• Controlled production rooms
• Pharmaceutical processing
• Clean corridors
• Laboratories
• Biotechnology facilities
• Controlled packaging areas
• Modular cleanrooms

Important project considerations include:

• Filter class
• Airflow distribution
• Cleanroom classification
• Ceiling layout
• Housing material
• Cleaning requirements
• Filter integrity testing
• Maintenance access

HEPA or ULPA selection should follow the actual cleanroom specification.

Related page: Pharmaceutical Cleanroom Air Filtration →

FFUs for Laboratories

Laboratories may use FFUs in:

• Modular cleanrooms
• Controlled work areas
• Clean booths
• Research spaces
• Electronics laboratories
• Pharmaceutical laboratories
• Precision assembly areas

FFUs should not be assumed to provide biological containment simply because they use HEPA filters.

For biosafety applications, equipment-specific containment requirements should be evaluated separately.

FFUs for Electronics Manufacturing

Electronics assembly can benefit from controlled particulate conditions where product quality is sensitive to airborne contamination.

Applications may include:

• Precision electronics
• Optical products
• PCB-related production
• Displays
• Sensor manufacturing
• Battery production
• Precision assembly

FFUs can support modular cleanroom design where controlled filtered airflow is required directly at ceiling level.

Cleanroom Classification and FFU Coverage

One of the most common FFU purchasing questions is:

“How many FFUs do I need for my cleanroom?”

There is no universal answer based only on room area.

FFU quantity depends on:

• Required cleanroom class
• Room dimensions
• Ceiling height
• Airflow per FFU
• Ceiling coverage
• Air-change requirement
• Heat load
• Process equipment
• Personnel
• Airflow pattern

A higher FFU ceiling coverage ratio can provide more filtered airflow, but proper cleanroom design still requires airflow balancing and commissioning.

FFUs are one component of the complete cleanroom system.

Custom Fan Filter Unit Manufacturing

Clean-Link can support custom FFU projects where standard modules do not match the equipment or cleanroom layout.

Project customization may include:

• Dimensions
• Unit height
• Filter class
• Airflow
• Motor option
• Speed control
• Housing material
• Power supply
• Filter seal
• Filter replacement access
• Ceiling-grid interface
• External control
• Packaging
• OEM labeling

Custom specifications should be reviewed before production.

OEM Fan Filter Unit Supply

Clean-Link can support OEM and project-based FFU supply for:

• Cleanroom contractors
• Cleanroom equipment manufacturers
• HVAC contractors
• Semiconductor projects
• Pharmaceutical projects
• Laboratory equipment suppliers
• Distributors
• Engineering contractors

OEM projects may include:

• Project-specific dimensions
• Private labeling
• Custom packaging
• Repeat specifications
• Bulk project supply
• Drawing-based manufacturing
• Component configuration
• Project documentation

Actual MOQ, lead time, electrical components and control configuration should be confirmed according to the project.

FFU Testing and Quality Control

FFU performance involves more than the filter alone.

Depending on project requirements, testing and inspection may include:

• Dimensional inspection
• Visual inspection
• Electrical inspection
• Fan operation
• Airflow testing
• Speed-control verification
• Filter resistance review
• HEPA / ULPA filter testing
• Leakage or scan testing requirements
• Noise testing
• Packaging inspection

ISO 29463-1:2024 provides the current classification, performance, testing and marking framework for high-efficiency filters.

Testing scope should be agreed before production.

Clean-Link should not claim that every FFU is certified to a particular cleanroom or HEPA standard unless the individual product and test documentation support that claim.

Replacement FFU Filters

FFUs eventually require filter replacement, but filter matching should not be based only on dimensions.

Buyers should confirm:

If full information is not available:

Start with FFU Photo + Filter Photo + Actual Dimensions + Application.

Related: Custom HEPA Filters →

 

How to Select a Fan Filter Unit

Before requesting a quote, provide as much of the following as possible:

1. Application
   Semiconductor, pharmaceutical, laboratory, electronics, cleanroom or OEM.

2. FFU dimensions
   Length × width × height.

3. Required airflow
   Air volume per unit.

4. Filter class
   H13, H14, U15, U16 or project requirement.

5. Filter pressure drop
   Target or existing data where available.

6. Motor type
   EC, AC or project-specific requirement.

7. Control method
   Local speed adjustment, 0–10 V, centralized control or other.

8. Power supply
   Voltage, phase and frequency.

9. Housing material
   Steel, aluminum, stainless steel or specified material.

10. Ceiling-grid type
    Opening dimensions and installation method.

11. Replacement method
    Top-side or room-side.

12. Noise requirement
    If a maximum sound level is specified.

13. Testing requirement
    Airflow, filter scan, leakage, noise or documentation.

14. Quantity
    Prototype, project quantity and repeat demand.

What to Send Clean-Link for an FFU Quote

For the fastest technical review, send:

FFU Size + Airflow + Filter Class + Power Supply + Control Method + Quantity

For a cleanroom project, also send:

• Ceiling-grid dimensions
• Room area
• Required cleanroom class
• FFU layout if available
• Ceiling coverage requirement
• Filter replacement method

For an existing replacement:

FFU Photo + Model/Label + Filter Photo + Actual Dimensions

 

Why Clean-Link as a Fan Filter Unit Manufacturer?

Clean-Link supports air-filtration and cleanroom projects requiring integration between the fan, HEPA/ULPA filter, housing and project conditions.

Our project support can include:

• HEPA FFUs
• ULPA FFUs
• H13 / H14 project requirements
• U15 / U16 / U17 requirements where applicable
• Mini-pleat high-efficiency filters
• Standard and custom sizes
• Airflow review
• Pressure-drop review
• Housing material options
• Motor and control configuration discussion
• Gasket and gel-seal filter options
• OEM project supply
• Drawing-based manufacturing
• Replacement filter matching
• Testing requirements where applicable

The objective is not simply to provide an FFU with the correct outside dimensions.

The FFU should be matched to the cleanroom airflow, filter resistance, ceiling system, electrical requirements, control architecture and maintenance strategy.

Request a Fan Filter Unit Quote

Need FFUs for a semiconductor cleanroom, pharmaceutical facility, laboratory, electronics plant, modular cleanroom or OEM project?

Send Clean-Link:

Size + Airflow + HEPA/ULPA Class + Power Supply + Control Requirement + Quantity

If available, also include:

• Cleanroom drawing
• Ceiling-grid dimensions
• Pressure-drop requirement
• Housing material
• Replacement method
• Testing requirements

Request an FFU Quote →

FAQ

What is a fan filter unit?

A fan filter unit is a self-contained clean-air module that combines a fan or blower, high-efficiency filter, housing and control components to deliver filtered air into a cleanroom or controlled environment.

What filter is used in an FFU?

FFUs commonly use HEPA or ULPA filters. H13 and H14 HEPA or U15/U16 ULPA filters may be specified depending on the application.

Can Clean-Link manufacture custom FFUs?

Clean-Link can support project-specific FFU dimensions, airflow, filter classes, housing configurations, motor/control requirements and OEM supply according to confirmed specifications.

What is the difference between a HEPA FFU and an ULPA FFU?

The main difference is the filter efficiency requirement. ULPA filters provide higher efficiency but may also impose different pressure-drop requirements, so fan performance needs to be reviewed.

Are EC motors used in fan filter units?

Yes. EC motors are widely used in modern FFUs because they support efficient variable-speed control. The required motor configuration should be confirmed according to the project.

Can FFUs use centralized control?

Yes. Large FFU installations can use centralized fan-speed and zone control. The exact communication or control architecture should be specified before production.

What size FFU do I need?

FFU size depends on ceiling-grid design, airflow, cleanroom layout and application. Standard ceiling modules are common, but custom dimensions may also be required.

How many FFUs are needed for a cleanroom?

There is no fixed number based on room area alone. Cleanroom class, airflow per unit, ceiling coverage, room height, heat load and process requirements all affect FFU quantity.

Can FFU filters be replaced from the cleanroom side?

Some FFU designs support room-side replacement, while others are serviced from above the ceiling. Replacement method should be confirmed during design.

What is the difference between a gasket-seal and gel-seal FFU?

A gasket filter seals through compression against the housing. A gel-seal filter uses a gel channel that interfaces with a compatible knife edge. The housing must match the selected seal design.

Can FFUs use ULPA filters for semiconductor cleanrooms?

Yes. U15, U16 and sometimes U17 requirements can be used in advanced cleanroom applications depending on the project specification.

What information is required for an FFU quotation?

Start with dimensions, airflow, filter class, power supply, control method, housing material, quantity and application. Ceiling drawings and testing requirements are also useful.