China H14 Mini-Pleated HEPA Filter Fan Filter Unit - High Efficiency Air Purifiers from Trusted Suppliers & Factory
Application Area
🔬 Electronics Industry: Semiconductor chip fabrication rooms, LCD panel production lines, precision PCB assembly rooms.
💊 Pharmaceutical and Bioengineering: Sterile preparation areas, vaccine production lines, Bio safety Laboratories (BSL-2/3), sterile filling lines.
🏥 Healthcare: Hospital operating rooms, sterile wards, ICU, bone marrow transplant wards.
🥛 Food and Beverage: Aseptic packaging areas, probiotic production zones, dairy product fermentation rooms.
🧪 Scientific Research: Animal laboratories, microbiology labs, precision instrument rooms.
FFU Structure
Material: Typically made of stainless steel or galvanized aluminum steel sheet, with anti-rust and anti-corrosion surface treatment. These materials ensure structural strength, resistance to rust, and minimal particle generation.
Support Frame: Provides structural support for the entire FFU, enabling it to be securely embedded into the ceiling grid (T-Bar) of the clean room.
Air Guidance: The internal design of the casing (e.g., guide vanes) helps optimize airflow, reduce turbulence, and ensure more uniform air passage through the filter.
This is the "heart" of the FFU, typically a direct-drive backward-curved centrifugal fan (EC or AC fan).
Uses an alternating current motor, with speed controlled by voltage regulation. Simple structure and lower cost, but relatively lower energy efficiency and less precise control.
Uses a brushless DC motor. The most mainstream type today. Offers high energy efficiency, long lifespan, low noise, and minimal vibration.
Electronically Commutated motor — an advanced form of DC motor. Combines advantages of AC and DC, providing extremely high energy efficiency and precise control performance.
This is the "lungs" of the FFU, responsible for filtering airborne particles.
Types: The vast majority of FFUs use HEPA filters, while ULPA filters are used for more stringent requirements.
🔒 Gel Seal: The filter frame has a channel filled with sealant gel. It mates with a knife-edge on the FFU casing, creating an airtight seal using the gel. This is the most efficient and reliable sealing method, commonly used in high-grade clean rooms.
🔩 Mechanical Clamping + Gasket Seal: The filter is pressed against the casing via a spring or bolt mechanism, with a rubber or polyurethane gasket in between. Relatively easier to install and lower in cost.
📟 Individual Controller: Each FFU is equipped with a separate speed controller (knob or digital display) for individual airflow adjustment.
🌐 Group Control System: A central management system that monitors, adjusts speeds, and manages alarms for hundreds or thousands of FFUs collectively via a network or bus (e.g., RS485, Ethernet), enabling intelligent control.
🛡️ Pre-filter: A primary or medium-efficiency filter on the fan's intake side. Protects the fan and extends the service life of the more expensive downstream HEPA/ULPA filter.
🌀 Airflow Equalizing Plate: A perforated plate located below the HEPA/ULPA filter. Makes the clean airflow exiting the filter more uniform and stable, preventing turbulent flow.
The Efficiency of HEPA Filter
✅ HEPA: Filtering efficiency ≥ 99.97% for particles ≥ 0.3μm.
⭐ ULPA: A higher-grade filter, efficiency ≥ 99.999% (for 0.1–0.2μm particles). Used in ultra-high standard fields like semiconductors and biosafety laboratories.
Service Life of Filters
The resistance of a filter increases with higher airflow rates. By increasing the surface area of the filter media, the relative velocity of air passing through the filter can be reduced, thereby decreasing the resistance.
Standard Form
Technical Parameters
EC FFU
EC FFU Parameters
Remarks: (1) Initial resistance tolerance of ± 10% (2) Support customer size