Fan Filter Unit with H14 Mini-Pleated HEPA Filter

Widely used in 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, pro biotic production zones, dairy product fermentation rooms.Scientific Research: Animal laboratories, microbiology labs, precision instrument rooms.

Casing

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.

Functions:

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.

Power Section – Fan

This is the "heart" of the FFU, typically a direct-drive backward-curved centrifugal fan (EC or AC fan).

Motor Types:

AC Motor: 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.

DC Motor: Uses a brush less DC motor. This is the most mainstream type today. It offers high energy efficiency, long lifespan, low noise, and minimal vibration.

EC Motor: Electronically Commutated motor, an advanced form of DC motor. It combines the advantages of both AC and DC motors, operates directly on AC power while converting it internally to DC to drive the motor, providing extremely high energy efficiency and precise control performance.

Features: The fan is directly connected to the motor, eliminating the need for belt drives. This avoids contamination from belt wear, results in a more compact structure, and simplifies maintenance.

Filtration Section – HEPA/ULPA Filter

This is the "lungs" of the FFU, responsible for filtering airborne particles.

Types: The vast majority of FFU use HEPA filters, while ULPA filters are used for more stringent requirements.

Installation Methods:

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 (e.g., jelly-like sealant). 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. This method is relatively easier to install and has a lower cost.

Other Key Components

Control Unit:

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 FFU collectively via a network or bus (e.g., RS485, Ethernet), enabling intelligent control.

Pre-filter: A primary or medium-efficiency filter located on the fan's intake side. Its purpose is to protect the fan and extend the service life of the more expensive downstream HEPA/ULPA filter.

Airflow Equalizing Plate: A perforated plate located below the HEPA/ULPA filter. It helps to make the clean airflow exiting the filter more uniform and stable, preventing turbulent flow.

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 bio safety laboratories.

As dust accumulates on the filter media, the resistance increases. When the resistance reaches an unreasonable level, the filter must be discarded. Sometimes, excessive resistance can cause previously captured dust to become dislodged and re-enter the airflow; when this risk arises, the filter should also be replaced. 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.

Remarks: (1) Initial resistance tolerance of± 10% (2) Support customer size