File talk:HEPA Filter diagram en.svg

<0.1um and <100nm is the same size

Err 1um = 1000nm so there are actually two labels for the same thing <0.1um and <100nm --62.49.4.186 (talk) 22:28, 17 March 2009 (UTC)

Seconded. Was it supposed to say <0.1um instead? 193.63.174.10 (talk) 12:10, 22 April 2009 (UTC)

EDIT - I've looked thru the sources, and there's nothing backing up the mentioned sizes. Where did they come from? Typical HEPA is listed on the links as being most effective in the 10 - 1000nm (0.01 - 1.0um) range, with a minimum requirement of catching 99.97% of material at 0.3um (300nm) which is for some reason most likely to penetrate (sits between the ranges where the listed effects are most effective?), and if you want super industrial cleanroom standard then other types are available to catch "99.99% at 0.12um" (120nm). So what's the source for the ">1.0um" and "0.1um / 100nm" sizes, please? And what size DOES brownian motion start having an effect? Should the dividing point(s) be 0.3um (and 0.1, still?) instead? I know this is a lot of analysis for a couple of unit measurements on a single image, but the devil is very much in the details here. 193.63.174.10 (talk) 12:19, 22 April 2009 (UTC)

EDIT-II -- quoting from the main article text, "Diffusion predominates below the 0.1 μm diameter particle size. Impaction and interception predominate above 0.4 μm. In between, near the 0.3 μm MPPS, diffusion and interception predominate". ... which seems to directly contradict the diagram, so what now? I'd fiddle with it myself, but no SVG editor ATM 193.63.174.10 (talk) 12:49, 22 April 2009 (UTC)