Echoing that, the EPA says filters rated MERV 7 to 13 are likely to be nearly as effective as true HEPA filters at controlling most airborne indoor particles. The higher end of the range, MERV 11 to 13, removes about 20% to 50% of the very smallest, 0.3- to 1.0-micron particulates
The American version of the Froster was introduced in 1999
The smoke itself is made up of tiny particles (often less than one micron in size) that float around in the air without settling, eventually finding their way to every corner of the room
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