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FAQ on Air Filtration

 


1.    What is Air Filter?

Air filter is a device used to filter particles from the air passing through it. It filters dust, pollen, pet dander, and other small particles out of the air.

 

2.    What is it made up of?

An air filter is usually made of natural or artificial fibre which is in woven or non-woven form.

 

3.    Where is it used?

Air Filters are used in air-conditioned buildings to improve and optimize air quality of the indoor environment.

 

4.    Why is it used?

The Air Inside Your Building Can Contain:

o   Molds, spores, pollens

o   Carbon Dioxide, Carbon monoxide, radon, volatile organic compounds (VOCs)

o   Bacteria, viruses and by-products

o   Vehicle engine exhaust, exhaust from industrial plants

o   Asbestos, clays, elemental particles and man-made fibers

 

5.    What are Mechanical air filters?

Mechanical filters are made up of mesh of material, usually synthetic or fiberglass fibers used in HVAC system and are installed within an HVAC Air Handling Units (AHU) of a building.

 

6.    How it works?

They work by trapping particles from the air onto the filter. It comes with different efficiencies.  Filtration efficiency is usually stated in terms of effectiveness in terms of arresting, capturing and holding particles of defined sizes.

 

7.    Types of mechanical air filters?

·         Pre-Filter or Coarse Filters

·         Medium Filters

·         Fine Filters

·         EPA Filters

·         HEPA (High Efficiency Particulate Air) Filters

·         Gas-Phase Filters

 

 

8.    What is the efficiency of Pre-Filter or Coarse Filter?

Pre-filters are the first stage of filters in a filtration system. Standard pre-filters have an average arrestance of up to 90% for the outdoor air as per EN 779 standard.

 

9.    What is the efficiency of Medium Filter?

Medium filters have the average efficiency of 40%~80% for a 0.4 micron size particles as per EN779 standard.

 

10. What is the efficiency of Fine Filter?

Fine filters have the efficiency of 80%~95% average efficiency and has 35%~70% minimum efficiency for 0.4-micron size particles as per EN779 standard.

 

11. What is EPA filter and what is its efficiency?

Efficient Air Filters (EPA) have the average integral efficiency of 85%~99.99% at MPPS (Most Penetrating Particle Size) as per EN1822 standard.

 

12. What does HEPA filters made up of?

HEPA Filters are made up of high-performance engineered materials typically eFRM (expanded FluoroResin Media, ePTFE (expanded    PolyTetraFluoroEthylene), Glass fibre media.

 

13. What does HEPA filter do? What is its efficiency?

High Efficiency Particulate Air (HEPA) filters are designed to capture very fine particles effectively. HEPA filters have the Integral efficiency of 99.999% efficiency at 0.3 micron (MPPS) as per EN1822.

 

14. Why is it important?

HEPA filters can trap particles as small as pathogens, bacteria, viruses, pollens to make the filtration space safe & allergy free.

15. What are the types of HEPA?

As per EN1822 standard there are only 2 types of HEPA Filters of grade H13 and H14. The filter constructions like Mini-pleat finds applications for Healthcare & Pharma industries which requires laminar air flow and

Deep pleat for Commercial AHUs and Biohazard exhaust.

 

16. What are its applications?

1.    Microelectronics

2.    Pharmaceutical Industry

3.    Healthcare Industry

4.    Pandemic of COVID-19

5.    Biotechnology

6.    Food & Beverage Industry

7.    Schools & Universities

8.    Laboratories

9.    Tech Parks & Office Buildings

 

17. Are there any filters with efficiency higher than HEPA?

There are ULPA (Ultra Low Particulate Air) Filters. Which are used in most critical environments and processes. The efficiency of these filters will be 99.9995% to 99.999995% for a 0.3 Micron Particle (MPPS) as per EN1822.

 

Contact us:

www.aaf-india.com

www.aaf-me.info

 

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