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<p>systems<br/>
* engine, compressor, gas turbine compressor intakes<br/>
* equipment(autos, aircraft, construction) cabins.<br/>
* human-made environments (e.g., <a href="page.php?w=satellite">satellite</a>s, and <a href="page.php?w=Space_Shuttle">Space Shuttle</a>s)</p>

<p>Air filters are typically constructed of <a href="page.php?w=foam">foam</a>, pleated paper, <a href="page.php?w=cotton">cotton</a>, or spun <a href="page.php?w=fiberglass">fiberglass</a>. Oil bath air filters have fallen out of favour aside from niche uses. </p>

<p><a href="page.php?w=Air_ionizer">Air ionizer</a>s</p><p>
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