All our listed members use modern, Hepa filter equipped vacuums. Hepa filtration is now the modern standard for greatly reduces all forms of particles released into the air. The result is a clean finish, with no dust from work being deposited onto any of your home surfaces. A great deal of our members add extra layers of filtration for an even better quality of filtration.
HEPA is a type of pleated mechanical air filter. It is an acronym for “high efficiency particulate air [filter]” (as officially defined by the U.S. Dept. of Energy). This type of air filter can theoretically remove at least 99.97% of dust, pollen, mold, bacteria, and any airborne particles with a size of 0.3 microns (µm). The diameter specification of 0.3 microns responds to the worst case; the most penetrating particle size (MPPS). Particles that are larger or smaller are trapped with even higher efficiency. Using the worst case particle size results in the worst case efficiency rating (i.e. 99.97% or better for all particle sizes).
All air cleaners require periodic cleaning and filter replacement to function properly. Follow manufacturer’s recommendations on maintenance and replacement.
Minimum Efficiency Reporting Values, or MERVs, report a filter’s ability to capture larger particles between 0.3 and 10 microns (µm).
This value is helpful in comparing the performance of different filters
The rating is derived from a test method developed by the American Society of Heating, Refrigerating, and Air Conditioning Engineers (ASHRAE) [see www.ashrae.org ].
The higher the MERV rating the better the filter is at trapping specific types of particles.
|MERV Rating||Average Particle Size Efficiency in Microns|
|1-4||3.0 – 10.0 less then 20%|
|6||3.0 – 10.0 49.9%|
|8||3.0 – 10.0 84.9%|
|10||1.0 – 3.0 50% – 64.9%, 3.0 – 10.0 85% or greater|
|12||1.0 – 3.0 80% – 89.9%, 3.0 – 10.0 90% or greater|
|14||0.3 – 1.0 75% – 84%, 1.0 – 3.0 90% or greater|
|16||0.3 – 1.0 75% or greater|