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PC FAn for cooling cabinet

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boardjunkie:
Then you'll need a speed control to slow it down. Onna these:
http://www.amazon.com/Leviton-6616-1XW-Single-Pole-Trimatron-Control/dp/B00332F4A8

Donkbaca:
No you don't. You just need a big fan

boardjunkie:
Any fan can be noisy....'specially a big one. I have an 8" Comair that sounds like a damn jet engine at full speed. Slowed down its not bad. I'm talking about 120vac fans now....not DC fans.

4" fans should be fine for the average cab. The CFM spec can be an indicator of how loud it will be, but not always. The full mfgr datasheet for the fan should have a dB spec for noise.

SavannahLion:
CFM is a poor indicator of noise levels if that's the only bit of information you have on the fan.  Donbaca's point is a fan of X size will move Y amount of air at Z decibel. A fan of X times 2 size can also move Y air but at <Z decibel.

Of course your point still stands. If dB is an issue, look at the specs. To me, dB is usually secondary. If I want a quieter fan, I usually increase the size and cut the RPMs.

Side note: I find that manufacturers who baffle their fans tend to he quieter than comparable non-baffled fans without cutting too deeply into CFM ratings.

Donkbaca:
I personally hate fans, I hate the noise.  The larger a fan slower it has to move, the slower it moves the quieter it is.  Unless you have some crappy fan that is loud because its built poorly.  If you take 2 fans from the same maker, the larger one will spin slower and be quieter. 

Long story short.  If you are going to add a fan, get the biggest one you can find.  It will work just as well or better than a smaller fan, and be more quiet

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