What is Air Filter?

The Air Filter system is basically responsible for keeping your room clean. Let's get to know more about Air Filter in this article with VCR

What is Air Filter?

Air filter is an air filter used to remove dust particles, pollution and harmful microorganisms in the air. Air filters are widely used in industries that require air quality and clean environment, especially in ventilation systems, air treatment, dust filtration for cleanroom ,...

We also often call air filter by filter the air, filtering air, filters…

What Air Filters are there? And its effect?

• Pre filtration: Filtration at the first stage in filtering / removing large particles.
  Intermediate filtration (secondary filtration/fine filtration): Filtration at the secondary stage 2 after filtering
• ULPA Filter: Can remove 99.999% of 0.12um or larger particles.
• HEPA Filter: Can remove 99.999% of particles of 0.3um or laảger

Read more: HEPA Filters And ULPA Filters Comparison

PRE FILTER

The pre filter is responsible for filtering large dust particles in the air before coming to the HEPA Filter or ULPA Filter.

Using coarse filtration is a great way to extend the life of HEPA Filter, because it has the effect of making HEPA Filter focus on effectively filtering ultrafine dust particles.

If your filter system has pre filtration, you should clean or replace the 6 - phosphate mineral filter every year or every other month. This will keep everything in your filter system running smoothly and will ensure that no part of the cleanroom passes the pre-filters that are excessively contaminated.

INTERMEDIATE FILTER (SECONDARY FILTER/PURIFIED FILTER)

Intermediate filter/secondary filter or fine filter is a way to call filtration at the 2nd stage of the air filtration system, after the pre filtration step. Intermediate filters/ secondary filters/ fine filters are capable of filtering larger dust particles before the air enters the final filtration step: high-efficiency filtration.

Secondary filtration according to EN779 standard is classified in group M (M5-M6) and group F (F7-F9).

HEPA FILTER

HEPA Filter is an air filter capable of removing 99.99% of particles with a size of 0.3um or larger.

HEPA filter is the most popular option used to filter ultrafine dust particles. These filters - when properly maintained and in the right environment - can last for a long time before having to be replaced.

Since every element in your cleanroom can have a different effect on the HEPA Filter, it is difficult to give a specific time frame for replacing the HEPA Filter. Temperature, warmth and air pressure levels all affect the lifespan of the HEPA Filter. Instead, we recommend that you check your HEPA filter and recognize signs of leakage or repairability.

If significant leaks are found, they can sometimes be repaired or you may have to replace the filter. The best thing to do is to make sure your filter is properly maintained to ensure the maximum life of your HEPA Filter.

ULPA FILTER

ULPA Filter air filter works similarly to HEPA filter, but is even more effective. Specifically, ULPA filter is considered to remove 99.999% of all dust particles with a diameter greater than 0.12um.

Because the ULPA filter works similarly to the HEPA Filter, the maintenance and replacement procedures are mostly the same. The difference between HEPA filter and ULPA filter is that ULPA Filter is usually much more expensive than HEPA Filter, making maintenance more frequent.

Therefore, make sure you schedule regular maintenance and always check for filter leaks and repair leaks.

Advantages of Air filter

• Products extend life thanks to air filters.
• The designs of the filter are improved to suit the purpose of use, compact, easy to assemble, move.
• Filter large coarse dust particles to ultra-fine dust particles, difficult to see with the naked eye.
• The higher the quality of the air filter, the more it saves the operating cost of the system.

Application of Air filter

In the cleanroom

The most prominent application of air filters is in cleanrooms. cleanrooms of pharmaceutical, electronic, food factories, etc. use air filters to purify the air in the working and production environments. Air filters are installed inside the air handling system (AHU), cleanroom HVAC.

cleanroom Air Filter is an indispensable part, regardless of whether it is SoftWall, HardWall or RigidWall cleanroom. Basically, Air Filter is responsible for keeping your cleanroom always clean.
Many Air Filter plates will remove the amount of particles you need to meet cleanroom standards.

In most cleanrooms, air is directed from the top of the room to the bottom, ensuring that dust particles are pushed out and there is no time to fall into places where they are not allowed. The air flow pushes the air through the air filters to remove particles. When air passes through the filter plates (air filter), the particles will be trapped into small fibers, which are randomly placed in the filter plate, and therefore removed from the air entering your cleanroom.

Building ventilation

Most apartments, office buildings, commercial centers, etc. are installed with building ventilation systems. The building ventilation system has the function of making air circulate better, removing polluting particles, and supplying fresh air to the internal area.

To achieve that, the ventilation system needs to use air filters to help remove dirt and pollutants.

In family life

Air filters are also present in the civil field. The environment is increasingly polluted by natural as well as artificial agents.

The deterioration of air quality negatively affects human health. This leads to an increase in the demand for air purifiers and air purifiers in the home.

Air purifiers often use air filters including coarse filters, intermediate activated carbon filters and HEPA filters as a comprehensive solution to air and odor problems in the house.

Other applications

Air filter is also used in air filtration for internal combustion engines, air filtration for cars, aircraft, computers, etc.