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09-16-2010, 09:59 AM
I have used Vantec Stealth 120mm (4") computer fans for years with great success. Lately the Silenex fans have been getting good reviews. The Stealths move 53 CFM each at only 28 dBa sound because they run at lower RPM than many others. I think the Silenex may even be rated quieter?
I have two of them in my 100G, 60" long canopy, both blowing in powered by a variable voltage wall wart so I can control fan speed according to the seasons and cooling needs and equal sized exit holes in the roof of the canopy for hot air to escape. The exit holes are above the reflectors so light does not escape but surprisingly I get air flow by natural convection alone even when the fans are off, works really nice.
I have 2x250w MH and 2x140w VHO
and used to use a 1/4HP chiller until I got my fans perfected. After two summers of the chiller never once running here in Phoenix, I sold it and use fans alone. The two in the canopy and a 7" Wal Mart clip on over the sump, thats it and the tank stays 79-81 year round with little power usage for cooling. I had them on timers before but now have them on my Reefkeeper Lite so they come on and go off as needed and will alarm andshut the lights off if it gets too hot though it has never done that before.
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