What You Should Know Aout Fan Filter Unit (FFU)

A Fan Filter Unit (FFU) is an air filtration system with an independent power source, typically mounted on the ceiling of cleanrooms. Its primary function is to maintain the levels of particulates and contaminants in cleanroom air through internal high-efficiency filters, ensuring product quality and the accuracy of experimental results.

Working Principle of FFU

The working principle of an FFU involves generating airflow through an integrated fan, drawing in either fresh air or recirculated air into the unit. The air passes through high-efficiency filters within the unit, removing particulates and microorganisms to produce clean air, which is then delivered to the cleanroom. Operators utilize a control system for data monitoring and fan adjustments to ensure the system operates correctly.

Core Components

1️⃣ Housing

The housing is the outer shell of the FFU, typically made from stainless steel or aluminum alloy. It is designed to support internal components while preventing dust and other contaminants from entering.

2️⃣ Fan

The fan serves as the power source for the FFU, responsible for driving airflow and delivering filtered air into the cleanroom. Operators can adjust the fan speed to control airflow according to varying requirements.

3️⃣ Air Filter

The air filter is the core component of the FFU, responsible for removing contaminants from the air. Depending on the cleanroom classification, HEPA or ULPA filters can be selected. Additionally, pre-filters may be added to capture larger particles, protecting high-efficiency filters and reducing energy consumption and replacement costs.

4️⃣ Controller

The controller's primary function is to monitor air quality, adjust fan speed, and control the operation of the fan. It consists of sensors, controllers, and actuators.

Advantages of Using FFU Systems

The rapid adoption of FFU systems is attributed to several key advantages:

>> Flexibility

FFUs come with their own power source, allowing them to be integrated into existing HVAC systems or used as standalone filtration units. Installation and maintenance are straightforward.

>> High Efficiency

Equipped with HEPA/ULPA high-efficiency filters, FFUs can effectively remove particles as small as 0.3 microns.

>> Cost Reduction

While the initial investment in FFU systems may be higher than traditional ducted systems, they offer long-term energy savings and low maintenance costs, effectively reducing operational expenses.

>> Low Noise

Compared to large central air handling systems, FFUs operate at lower noise levels (centrifugal fans provide significant noise reduction).

>> Space Saving

The installation of FFUs significantly reduces the volume of ductwork needed for centralized air distribution. Their dimensions can also be customized to meet various application requirements.

How to Purchase an FFU?

When selecting the appropriate FFU, consider the following key points:

✓ Determine Filter Grade

HEPA filters can effectively capture particles as small as 0.3 microns, achieving a filtration efficiency of 99.97%.

ULPA filters can capture particles as small as 0.12 microns, with an efficiency of up to 99.9995%.

✓ Determine Size and Airflow

When procuring an FFU, manufacturers will ask for the required size and airflow. Airflow is a critical parameter for maintaining cleanliness and should be accurately calculated based on the cleanroom volume and air change rates.

✓ Consider Noise Levels

Different production environments have varying noise requirements. For noise-sensitive areas, it is essential to confirm the operational noise levels (in decibels) with the FFU manufacturer to avoid disrupting the cleanroom or laboratory operations.

For further assistance regarding FFU installation, please contact Amorair for professional technical advice.