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Old 01-08-2006, 02:12 PM   #1
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CPU Cooling Fan Placement Questions

I have a large canopy (18in tall) and I need some advice on where to place my CPU fans (92mm, 4 total). I have no problem wiring these up to be place anywhere in the tank/sump but I need to know where the most effective places would be to keep the water cool.

The canopy is open back.

Should I place these on the back of the canopy (suspended from the top about half way down) blowing air in? Blowing air out?

Should I place these under the tank stand in a similar fashion?

Should I have these blowing on the water? If so, in what positions in the tank (the middle, the edges, center?)

Should I have these mounted near the front of the canopy blowing air back to the rear, open end?



I'm curious what each of you have done with your setups and what is the most effective. My temp is at 84 deg near the end of the MH lighting period and I need to get it cooler before summer.
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Old 01-08-2006, 03:16 PM   #2
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blowing in is better.
get 4 place 2 on top 2 on the bottom to keep the air cool. Keep the air between the tank and light the coolest thats were all the heat goes in the water. have them close to back to get the cool air in,
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Old 01-08-2006, 07:07 PM   #3
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I dont have a conopy on this tank but on my last tank I had mine on side blowing out. You want the fans IMO to blow the heat out so it wont heat up your tank.
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Old 01-08-2006, 10:52 PM   #4
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There is sometimes a potential problem with all the fans blowing either in or out. It can iether create pressure inside, albeit very slight, or the reverse, an ultra slight vacuum. Wither way the fans have difficulty moving air. If the canopy has an open back then this is not really a problem, but either way, I like 1 or 2 blowing across the water and the other two at the top blowing out the hottest of the air.
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Old 01-09-2006, 12:15 AM   #5
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I have 2 80mm fans on the roof of the canopy blowing out and a 120mm fan on the back blowing in
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Old 01-09-2006, 03:13 PM   #6
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Old 01-09-2006, 09:24 PM   #7
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But he has a open back
Blowing out is point less cause your not really get in the fresh in. if he had a close canopy then yes blowing out is better. Holes on one side then fan on the other.
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Old 01-09-2006, 09:41 PM   #8
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But he has a open back
Blowing out is point less cause your not really get in the fresh in. if he had a close canopy then yes blowing out is better. Holes on one side then fan on the other.
Yes, I have an open back. I will have all 4 fans blowing in. 1 at each corner of the tank blowing towards the middle. I'll let you know how much my temp drops. It's roughly at 84deg at the end of my 6 hour MH cycle.
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Old 01-09-2006, 10:37 PM   #9
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Brovo Chap.

I know my CPU fans. i have them with my pc lights. The air in the canopy will be a lot cooler. Before I installed Cpu fans, ever time i open the canopy lid there would get this breeze of really hot air. and would need to live the lid open . but now the fixture stays cool and the canopy outside dosent get hot.
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Old 01-09-2006, 11:56 PM   #10
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oh and quick note if your diy this make sure that power supply is DC 12 not DAC 12. I didnt notice that until it was to late fry'd my first batch of fans.
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