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File:HEPA Filter diagram en.svg

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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.
Source Did myself using this sources: [1], [2], [3], [4], [5], [6], [7], [8], [9].
Author LadyofHats
(Reusing this file)
Public domain This work has been released into the public domain by its author, LadyofHats. This applies worldwide.
In some countries this may not be legally possible; if so:
LadyofHats grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.
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current02:11, 25 February 2013Thumbnail for version as of 02:11, 25 February 2013607 × 544 (343 KB)Ysangkok (talk | contribs)scour
08:06, 1 September 2008Thumbnail for version as of 08:06, 1 September 2008607 × 544 (395 KB)LadyofHats (talk | contribs)corrected particle size, aded average size of particles and trajectory on difuccion
21:55, 15 August 2008Thumbnail for version as of 21:55, 15 August 2008607 × 544 (384 KB)LadyofHats (talk | contribs)darker text
21:17, 14 August 2008Thumbnail for version as of 21:17, 14 August 2008607 × 544 (384 KB)LadyofHats (talk | contribs)this is a corrected version of the original
21:16, 14 August 2008Thumbnail for version as of 21:16, 14 August 2008607 × 544 (320 KB)LadyofHats (talk | contribs)THID VERSION CONTAINS LABELS AS TEXT!
16:01, 13 August 2008Thumbnail for version as of 16:01, 13 August 2008607 × 544 (382 KB)LadyofHats (talk | contribs){{Information |Description=diagram showing the main parts of a HEPA filter and the way it works. |Source=Did myself using this sources: [], [
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