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Computer Hardware
How is CFM & dB Measured & Other Fan Related Doubts
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<blockquote data-quote="Shripad" data-source="post: 44341" data-attributes="member: 272"><p>CFM is usually rated on the fan if its god quality brand. to measure CFM practically you will have to measure abount of air displaced by the fan in 1 min which is not an easy thing to do.</p><p>Now on to sleeve bearing and ball bearing.</p><p>I prefer ball bearing fans. They last long. The fan position makes no difference on performance.</p><p>Sleeve bearing is useful for quiet operation at low speeds. but if rotated at high speeds its not that quiet compared to ball bearing and also sleeve bearing is suitable for vertical mounting only.</p><p>Horizontal (parallel to ground) mounting reduces its life.</p><p>The following links should help.</p><p><a href="http://www.currentsolutions.com/knowledge/ballbearingvssleevefans.htm" target="_blank">http://www.currentsolutions.com/knowledge/ballbearingvssleevefans.htm</a></p><p><a href="http://www.siliconacoustics.com/fanfaq.html" target="_blank">http://www.siliconacoustics.com/fanfaq.html</a></p></blockquote><p></p>
[QUOTE="Shripad, post: 44341, member: 272"] CFM is usually rated on the fan if its god quality brand. to measure CFM practically you will have to measure abount of air displaced by the fan in 1 min which is not an easy thing to do. Now on to sleeve bearing and ball bearing. I prefer ball bearing fans. They last long. The fan position makes no difference on performance. Sleeve bearing is useful for quiet operation at low speeds. but if rotated at high speeds its not that quiet compared to ball bearing and also sleeve bearing is suitable for vertical mounting only. Horizontal (parallel to ground) mounting reduces its life. The following links should help. [url]http://www.currentsolutions.com/knowledge/ballbearingvssleevefans.htm[/url] [url]http://www.siliconacoustics.com/fanfaq.html[/url] [/QUOTE]
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How is CFM & dB Measured & Other Fan Related Doubts
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