HEPA Filters in Vacuums – How they work

When most of us think of air pollution, we think of factory emissions, and exhausts. But air degradation is happening much closer to home. Inside our homes to be exact. We are likely to find dust mites, pet dander, mold spores and pollen in the air we breathe. These could irritate the lungs and contribute to asthma or allergies. By using HEPA filters in vacuums, you will trap all of these pollutants and provide allergy relief for your family.


Vacuum cleaners that are equipped with high-efficiency particulate air (HEPA) filters trap the dirt that we cannot see. They work by forcing the air thru a fine mesh, which traps most harmful particles. They catch dust mites, pet dander, pollen and tobacco particles. Some of the European manufacturers use the word S-class on their vacuum models, to indicate HEPA filters.

To qualify as an approved HEPA filter, the manufacturers’ vacuums must be able to trap 99.97 percent of  emissions from a vacuum system, down to a tiny 0.3 microns in size. This can make a real difference if your family members have asthma or breathing issues.

Vacuum cleaners using HEPA filtration normally cost more than others. With many brands, to save money, you have to clean the filters yearly or you can regular replacements if you prefer. You should check the product manual instructions in this regard before buying. Fortunately, if you already own or plan to buy one of the high end models in the Dyson vacuum range, there is no need to replace their HEPA filters at all.


HEPA Filters in VacuumsHEPA filters in vacuums are made of a fabric of tangled and warped fibers. All these fibers are in random structure or pattern. The strands curve and bend in all different directions to form a maze that air is forced to pass through. The particles that pass through the filters are caught in the maze in 4-ways: sieving, impaction, diffusion and interception.

Sieving – Just like using a sieve in the kitchen, some particles get stuck in the gaps between the threads because the gaps are just too small for them  to pass through.

Impaction – Some particles simply collide with the threads and just stick to them.

Diffusion – Smaller particles are bumped randomly by the molecules in air and eventually knock into and stick to the fibers.

Interception – particles are forced through the Filter because of the suction. As the airflow passes over and through the  fibers, these tiny particles are separated from the air flow as they make contact with the fibers and stick to them.


HEPA Filters In Vacuums remove 99.97% of dustJust remember that no filter is perfect, but HEPA definitely works and helps remove most of the airborne particles in your home that might trigger or inflame allergies.

This is particularly important when dealing with Pets.

Offending particles are mostly found in your bedding, rugs, and drapes, or resting on tabletops and counter tops. So these areas are important to keep clean.

In your home, there are other elements that should also be part of your  plan to combat allergens.

  • Do not smoke inside the house.
  • Vacuum frequently.
  • Keep pets away from the sleeping area, Especially family members who are allergic to pet dander.
  • Change and wash your bedding frequently.
  • Use roll up shades, instead of curtains and drapes.


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