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MERV Ratings

Click:21 Time:2019-08-29 16:31:11

MERV Ratings

Views:57     Author:Gordon     Publish Time: 2018-01-12      Origin:FILTERHUT 

MERV stands for "Minimum Efficiency Reporting Value". It is a measurement scale designed by the ASHRAE, the American Society of Heating, Refrigerating and Air-Conditioning Engineers. The independent scale allows for accuracy in measuring a filters ability to capture contaminates. This can help gauge needs for health and costs.

For example, according to "Residential Air Cleaners (2nd Edition): A Summary of Available Information", a HEPA filter is often impractical in central HVAC systems due to the large pressure drop the dense filter material causes. Experiments indicate that less obstructive, medium-efficiency filters of MERV 7 to 13 are almost as effective as true HEPA filters at removing allergens, with much lower associated system and operating costs. The table below shows various MERV ratings and their typical applications.

MERVMin. particle sizeTypical controlled contaminantTypical Application
1–4> 10.0 μmPollen, dust mites, cockroach debris, sanding dust, spray paint dust, textile fibers, carpet fibersResidential window AC units
5–810.0–3.0 μmMold, spores, dust mite debris, cat and dog dander, hair spray, fabric protector, dusting aids, pudding mixBetter residential, general commercial, industrial workspaces
9–123.0–1.0 μmLegionella, Humidifier dust, Lead dust, Milled flour, Auto emission particulates, Nebulizer dropletsSuperior residential, better commercial, hospital laboratories
13–161.0–0.3 μmBacteria, droplet nuclei (sneeze), cooking oil, most smoke and insecticide dust, most face powder, most paint pigmentshospital & general surgery


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