Merv Air Filter Rating
As the merv rating increases the finer the filtration becomes.
Merv air filter rating. The scale rates how well a filter removes fine particulates from the incoming air. Such particles include dust mites, animal dander, hair spray, and mold pollen. Higher value merv rating equates to finer filtration, meaning fewer dust particles and other airborne contaminants can pass through the filter.
When selecting the right filter for your application, higher is not always better. Mpr (microparticle rating) is a rating system that includes microscopic particles not visible to the naked eye. Ashrae developed the merv air filter efficiency rating system.
The merv filter rating is the domestic and international industry standard rating system established by the american society of heating, refrigerating, and air conditioning engineers. Closer to the high end of the scale, even very small particles are blocked from passing through the filter. They are good at catching small particles of between 3 and 10 micrometers in size.
A low merv rating means that the filter does not remove as many particulates from the air. Using an air filter with a merv rating higher than what your furnace or air conditioner manufacturer recommends can actually impair its performance. If you are looking for an ordinary household air filter for maintaining efficient airflow and better air system performance, then merv 8 is the filter you need.
With finer filtration, fewer airborne contaminates & dust particles are allowed to pass through the filter. The merv rating on an air filter was designed by the american society of heating, refrigerating, and air conditioning engineers (ashrae) to rate the effectiveness of air filters. The right merv rating on the right filter could strongly influence impact your indoor air quality, your family’s health and your lifestyle.
Merv rating chart standard 52.5 minimum efficiency reporting value dust spot efficiency arrestance typical controlled contaminant typical applications and limitations typical air filter/cleaner type 20 n/a n/a < 0.30 pm particle size cleanrooms >99.999% eff. The smaller pores in more highly rated air filters create resistance to air. The higher the rating, the smaller air particulates that the filter can capture, which means cleaner air.
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