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    • Which Unit Do I Need?
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Jun 30

BRIEF: Filter Ratings Explained

If you’ve read our previous article on MERV and HEPA filters, you might be wondering what the ratings mean next to the filters. Similarly, you might be wondering what the “Class M according to DIN EN 60335-2-69” means next to some of the filter classifications for some of our fume extractors.

Wonder no more! In this article, we’ll be providing you with some general knowledge charts of the filter classifications’ rough numbers on their filtration efficiency.

MERV Filter Ratings

Minimum Efficiency Reporting Value filters are rated from 1-16.

MERVMinimum particle sizeTypical controlled contaminantTypical application
1 – 410.0 μmPollen, dustResidential window air conditioning units
5 – 810 – 3 μmMold, pet danderResidential, general commercial and industrial workspaces
9 – 123 – 1 μmLead dust, auto emission particulatesSuperior residential, better commercial, hospital labs
13 – 161 – 0.3 μmBacteria, droplet nuclei (sneeze), most smokeHospital and general surgery

HEPA Filter Ratings

High-Effiency Particulate Air filters must remove at least 99.95 – 99.97% of particles with a diameter equal to 0.3 μm.

HEPA classRetention (averaged)
E1085%
E1195%
E1299.5%
H1399.95%
H1499.995%
U1599.9995%
U1699.99995%
U1799.999995%

M according to DIN EN 60335-2-69

EN 60335-2-69 refers to requirements for wet and dry vacuum cleaners for industrial and commercial use. Specifically, this code refers to the collection of hazardous, non-radioactive dust which is hazardous to health if inhaled, swallowed, or comes into skin contact. This includes micro-organisms and asbestos.

Within fume extractors, there are typically 3 classes for hazardous dust collection:

ClassMinimum particle sizeRetention
Class L< 2 μm99%
Class M< 2 μm99.9%
Class H< 1 μm99.995%

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