diagram showing the main parts of a HEPA filter on the large diagram; its operation is shown on the 3 smaller diagrams: 
<ul><li>the thick brown/tan lines represent fibers in the filter medium.</li>
<li>the blue lines represent air flow.</li>
<li>The dark circle represents a particle (dust, bacteria, spore, etc.)</li>
<li>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.</li>
<li>in the case of diffusion, the particle (usually 0.1 µm or smaller) has such a trajectory because of the collision with gas molecules.</li></ul>
Translated into Telugu by <a href="//commons.wikimedia.org/wiki/User:Mekala_Harika" title="User:Mekala Harika">User:Mekala Harika</a>
2019-03-12
<a rel="nofollow" class="external autonumber" href="http://people.seas.harvard.edu/~jones/lab_arch/nano_facilities/hepa.gif">[1]</a>, <a rel="nofollow" class="external autonumber" href="http://www.sage-earth-sciences.com/hepa/closeup.jpg">[2]</a>, <a rel="nofollow" class="external autonumber" href="https://www.cdc.gov/OD/OHS/biosfty/bsc/fig1.htm">[3]</a>, <a rel="nofollow" class="external autonumber" href="http://web.princeton.edu/sites/ehs/biosafety/biosafetypage/section4.htm">[4]</a>, <a rel="nofollow" class="external autonumber" href="http://www.freepatentsonline.com/7048501-0-large.jpg">[5]</a>, <a rel="nofollow" class="external autonumber" href="http://www.explainthatstuff.com/hepafilters.html">[6]</a>, <a rel="nofollow" class="external autonumber" href="http://www.biologicalcontrols.com/images/hepa.jpg">[7]</a>, <a rel="nofollow" class="external autonumber" href="http://www.engr.psu.edu/ae/iec/abe/control/filtration.asp">[8]</a>, <a rel="nofollow" class="external autonumber" href="http://www.biologicalcontrols.com/images/fe.jpg">[9]</a> by <a href="//commons.wikimedia.org/wiki/User:LadyofHats" title="User:LadyofHats">LadyofHats</a>