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Minimum Efficiency Reporting Value (MERV) is an industry standard that measures the overall effectiveness of air filters. As the MERV rating increases the finer the filtration becomes. With finer filtration, fewer airborne contaminates & dust particles are allowed to pass through the filter. The most common "Airborne Contaminates" that these filters are tested against tend to include pollen, dust mites, mold spores, dust, pet dander, bacteria and tobacco smoke. Below is a table grouping MERV ratings by particle size: 1–4 (> 10.0 μm) Pollen, dust mites, cockroach debris, sanding dust, spray paint dust, textile fibers, carpet fibers Residential window AC units 5–8(10.0–3.0 μm) Mold, spores, dust mite debris, cat and dog dander, hair spray, fabric protector, dusting aids, pudding mix Better residential, general commercial, industrial workspaces 9–12 (3.0–1.0 μm) Legionella, Humidifier dust, Lead dust, Milled flour, Auto emission particulates, Nebulizer droplets Superior residential, better commercial, hospital laboratories 13–16 (1.0–0.3 μm) Bacteria, droplet nuclei (sneeze), cooking oil, most smoke and insecticide dust, most face powder, most paint pigments hospital & general surgery 17–20 (< 0.3 μm) Virus, carbon dust, sea salt, smoke Electronics & pharmaceutical manufacturing cleanroom
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