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  • Writer's pictureAnne Lee

Different Types of Air Filters



Types of Air Filters

There are numerous types of air filtration tools, which are devices that filter the air by removing debris like dust and dirt. The air filtration industry has undergone a number of alterations in the last ten years.


Manufacturers have created new products that improve indoor air quality while lowering the expense of installing and operating air-filtration systems in commercial and institutional buildings (IAQ).


In addition to technological advancements, industry organisations are adopting standards, guidelines, and specifications that promote healthy IAQ.


There is ongoing discussion about how IAQ affects building occupants, including whether occupant productivity and overall health increase with better air quality.


As they continue to focus on IAQ and its impact on their facilities and occupants, manufacturers are providing maintenance and engineering managers with more effective HVAC systems and components, including air filter systems.


These technical developments also include improved filter efficiency and smaller fans and motors due to the reduced pressure drop across the filters.



Types of Filters


The American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE) introduced IAQ standards, which resulted in a major change in the air-filtration industry.


ASHRAE has been promoting the use of the minimal efficiency reporting value (MERV) method to standardise efficiency definitions.


MERV measures a filter's arrestance, or its ability to capture large airborne particles, and dust-spot efficiency, or its ability to capture small airborne particles, and then assigns a number based on the filter's ability to do so.


The following air filters are frequently found in business HVAC systems:


1. Fiberglass filter


Fiberglass filter

This throwaway air filter is the most common type. Fiberglass layers are stacked on top of one another to create the filter material. Typically, a metal grating that serves as support and shields the fibreglass from failure and disintegration reinforces the material.



2. Polyester and pleated filters


Polyester and pleated filters

These filters are comparable to fibreglass filters, but they typically offer superior dust-stopping and airflow resistance.



3. High efficiency particulate arrestance (HEPA) filters


High efficiency particulate arrestance (HEPA) filters


The air that travels through these machines is filtered on a very fine scale. The U.S. Department of Energy (DOE) and its contractors use HEPA filters that conform to DOE standard STD-3020-97, Specification for HEPA Filters Used by DOE Contractors, to filter 99.97% of all particles measuring 0.3 microns or larger.




4. Washable air filters


Washable air filters


These less popular goods rely on the buildup of dust along the cloth to improve the filter's efficiency. Applications frequently involve commercial activities that generate a lot of coarse grit.


In Summary

There hasn't been much progress made to address the problems associated with air pressure drop and how it affects energy efficiency because filters are essentially just porous membranes that let air flow through them.


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