DescriptionHEPA Filter diagram es.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	12 November 2010, 22:00 (UTC)
Source	HEPA_Filter_diagram_en.svg
Author	HEPA_Filter_diagram_en.svg: Kizar derivative work: Kizar (talk)
Permission (Reusing this file)	This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license. You are free: to share – to copy, distribute and transmit the work to remix – to adapt the work Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original. https://creativecommons.org/licenses/by-sa/3.0CC BY-SA 3.0 Creative Commons Attribution-Share Alike 3.0 truetrue

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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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