DescriptionHEPA Filter diagram fr.svg	English: diagram showing the main parts of a HEPA filter on the large diagram; its operation is shown on the 3 smaller diagrams: *the thick brown/tan lines represent fibers in the filter medium. *the blue lines represent air flow. *The dark circle represents a particle (dust, bacteria, spore, etc.) *the dotted red line represents the trajectory of the particle; consider that as soon as a particle comes within one radius of a fibre it adheres to it. *in the case of diffusion, the particle (usually 0.1 µm or smaller) has such a trajectory because of the collision with gas molecules. On the 100 nm to 1 micron scales that are the most challenging for filters, it is helpful to think of air as a viscous fluid like molasses. As the fluid flows through the filters, particles are carried around the fibers of the filter medium, for the most part. Inertial impaction: Larger particles (>1 micron) may be massive enough to continue to move in nearly a straight line (Newton's Law), as the flow is diverted around a fiber. Interception: Smaller particles are not much affected by inertia, but, if they are carried within one particle radius of the fiber, they will be intercepted by it. Diffusion: Still smaller particles (<100 nm) move randomly among streamlines as they are buffeted by collisions with molecules. A particle along a streamline that approaches a fiber very closely may be knocked against the fiber by such a collision. English: This image was created as part of the Philip Greenspun illustration project.
Date	10 September 2010, 18:24 (UTC)
Source	HEPA_Filter_diagram_en.svg through HEPA_Filter_diagram_de.svg
Author	HEPA_Filter_diagram_en.svg: LadyofHats HEPA_Filter_diagram_de.svg: Rotkäppchen derivative work: The RedBurn (talk)
Permission (Reusing this file)	Public domainPublic domainfalsefalse This work has been released into the public domain by its author, The RedBurn. This applies worldwide. In some countries this may not be legally possible; if so: The RedBurn grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.

This is a retouched picture, which means that it has been digitally altered from its original version. Modifications: Translation to French. The original can be viewed here: HEPA Filter diagram en.svg: . Modifications made by The RedBurn.

Original upload log edit

This image is a derivative work of the following images:

• File:HEPA_Filter_diagram_en.svg licensed with PD-user
  • 2008-09-01T08:06:29Z LadyofHats 607x544 (404084 Bytes) corrected particle size, aded average size of particles and trajectory on difuccion
  • 2008-08-15T21:55:12Z LadyofHats 607x544 (393067 Bytes) darker text
  • 2008-08-14T21:17:27Z LadyofHats 607x544 (393021 Bytes) this is a corrected version of the original
  • 2008-08-14T21:16:33Z LadyofHats 607x544 (327559 Bytes) THID VERSION CONTAINS LABELS AS TEXT!
  • 2008-08-13T16:01:32Z LadyofHats 607x544 (391421 Bytes) {{Information |Description=diagram showing the main parts of a HEPA filter and the way it works. |Source=Did myself using this sources: [http://people.seas.harvard.edu/~jones/lab_arch/nano_facilities/hepa.gif], [http://www.sa

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