What Is FFU? - The Definition Of Fan Filter Unit

  • 06, 11, 2020

What Is A Fan Filter Unit?

What is a fan filter unit? You are wondering the structure, the specifications of FFU, and the advantages it offers for cleanroom. Let's find the answer with Vietnam Cleanroom - VCR

What is FFU?

FFU (Fan Filter Unit) is an air cleaning device, used to provide clean air to cleanroom in the plants of semiconductors, liquid crystal diodes, etc. Fan filter unit is installed on the grid ceiling system. In large cleanrooms, the number of equipment needed ranges from hundreds to thousands.

what is fan filter unit?  

Why do we need fan filter unit (FFU)?

1. To reduce operating costs by saving energy

2. To reduce construction costs because of thin, light, and compact structure of fan filter unit

3. To reduce the initial cost of the overall cleanroom design like the noise ...

-> FFU has been developed to comply with requirements for cleanroom construction, operations, and maintenance. 

Fan filter unit structure

1. Housing

The FFU housing is made of galvanized steel, powder-coated steel, or stainless steel SUS 304. The housing material can be chosen according to customer's requirements

fan filter unit housing

Image: FFU housing

2. Fan

It sucks and blows the air towards HEPA filter. 

ffu fan

Image: FFU fan

3. FFU Filter

The filter used for FFU is HEPA filter or ULPA filter. This is the most important part of FFU, which filters the air and creates a fresh and clean environment. 

 

FFU HEPA filter

Image: FFU HEPA filter

4. Controller switch

Fan filter unit is equipped with a 3-level switch for speed control, and on/off switch. There are 3 levels of air velocity (low, medium, and high)

FFU switch

Image: FFU switch

Fan filter unit working principle

  • The air is pulled in from outside by the fan
  • Then it is forced through the HEPA filter.  
  • HEPA filter traps the dust, bacteria and airborne particles, the filtered air goes out. 
  • The fan filter unit is unducted. Most of the time, fan filter unit pulls air from the ceiling plenum, pulls it out before it goes to space

What are the advantages of a cleanroom having FFUs?

1. Construction time can be shortened

2. Cleanliness level from class 1 to class 1000 can be set differently in each area

3. Because the opposite part of the ceiling has low pressure, the potential for this leakage is low

4. The arrangement of FFU partly decides the cleanroom construction method

5. The air velocity can be adjusted in each area

6. Flexible increase or change of the cleanroom is possible due to the arrangement of the fan filter unit. 

Specifications of FFU - fan filter unit

FFU size: There are 2 common sizes on the market (LxWxD): 1175x575x250 mm and 575x575x250 mm  

Airflow: The airflow of FFU is around 1000-1200 m3/h for FFU1175, and 600 m3/h for FFU575

Noise level: The noise in non-unidirectional airflow must not be louder than 60dB, while the noise in unidirectional airflow must not be greater than 65dB. Therefore, when choosing fan filter unit, the noise level of FFU is as low as possible. 

Air velocity: The average air velocity is about 0.45m/s 

Control system: DC motor is energy-saving and has a smart control, and lower noise, while AC motor has louder noise. The AC motor is much cheaper than DC motor. 

Air filter: HEPA filter with efficiency up to 99.99% at 0.3 micron particles, ULPA filter with efficiency up to 99.99% at 0.1 micron particles

Below are the specifications of 2 models of FFU provided by Vietnam Cleanroom - VCR

1. FFU 600 * 600 * 300

Body material: Zinc plated aluminum

Actual size: 575 * 575 * 220 

Power source: 220V / 50HZ 

Speed ​​governor: Speed ​​governor 

High-grade filter: Actual size: 570 * 570 * 80 

Filtration efficiency: 99.99% H13

Filter material: Filter paper against fire, moisture

Surface protection mesh: Two sides sprayed with electrostatic paint

2. FFU 1200 * 600 * 300

Body material: Zinc plated aluminum

Actual size: 1175 * 575 * 220 

Power source: 220V / 50HZ 

Speed ​​governor: Speed ​​governor 

High-grade filter:  1170 * 570 * 80 (actual size)

Filtration efficiency: 99.99% H13

Filter material: Filter paper against fire, moisture

Surface protection mesh: Two sides sprayed with electrostatic paint

Fan filter unit - FFU installation

Image: FFU installation

Step 1: Prepare the ladder

Step 2: Check the fan and the filter 

Step 3: Install the fan on the ceiling 

Step 4: Install HEPA filter 

Watch the video below to find out what is FFU 

Vietnam Cleanroom Equipment (VCR) specializes in providing cleanroom equipment for construction contractors. 

We provide high-quality products with competitive prices and large quantities nationwide. The equipment includes:

Differential pressure gauge, FFU Fan Filter Unit, Pass box, Clean room air filter, HEPA box, Clean booth, cleanroom steel door, Isolator cabinet, and other equipment

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