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Filter Media in Filtration: Hepa Filters

Understanding how Hepa Filters work will gives our customers the tools they need to make an informed decision when it comes to Air Purification. Hepa Filters have a four part filtration process: Direct Impaction, Sieving, Interception and Diffusion.


Direct Impaction is of large contaminants like dust, mold and pollen; these particles travel in a straight path can collide with a fiber, and stick to it. Sieving is the second part of the process which the airstream carries a particle between two fibers and the particle is larger than the gap and becomes trapped. Interception is the third part where the airflow continues through the filter and particles get stuck on the sides of fibers. And the last part is Diffusion were the smallest particles move more erratically and hit even more fibers. Hepa filters are used in many consumer products such as cars, vacuum cleaners and air purifiers.

 Media Filters

This filter type uses a bed of sand, peat, shredded tires, foam, crushed glass, geo-textile fabric, anthracite, crushed granite or other materials for filtration. Similar to a lint trap in your dryer, a media filter collects dust, dirt and other particles as it passes through your HVAC system. This is a cabinet that is placed in the return air duct of the forced air system. As the air passes through your HVAC system, the media air cleaner traps airborne particles within the filter media before they reach your indoor atmosphere. This allows for more and better air filtration.

Ultraviolet Filters and Lights

UV lights are utilized in hospitals, nursing homes and NASA to keep indoor air sterilized and free of bacteria and other harmful particles. These units are installed in you HVAC system return air duct and work to sterilize air as it passes through the system.

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