How to connect cooling fans

The best way to ventilate an area is you put the fans at the larger opening, but you need the wind from the fans to blow over the entire opening. That will pressurize the tank and the air will flow out the smaller hole with force.
 
They are 12volt, but you can usually run them pretty low. I'm running a 120mm case fan at about 6 volts. You just need to make sure that it starts turning everytime. Lower voltage means less air movement, but less noise. It will probably move enough air to do the job though.
 
starting from scratch.

The above is a great idea.
Do they sell cooling fans specificly for aquariums?
I have 125 gal tank I need to cool down similar situation.
What size or how many fans would I need.
I dont have a canopy but dont have a problem building one if it will help with the cooling of the tank.
Thanks alot....
 
Hello, I beleive that they do sell pre-made fan systems but will most likely cost more thn just simply doing it yourself. Do a search on google for "Aquarium Cooling Fans" and you will find many different places that can sell you something to suit yur needs.
 
The easiest way and cheapest is to do it yourself. It is pretty easy to do also. Simply get an old pc fan and get an AC adapter that is rated for 12v. Next simply splice the wires on the fan and the adapter then connect the wires together. Most PC fans have 3 wires, you will only need to use 2 of them. It will either work or not work. If the wires are backwards then it simply won't run. Once you find the right wire combo then tape the wires with some electrical tape and plug the fan in. You will then have the adapter that goes right to the fan and it will start to spin. Then just set it in an area on the tank so the fan blows over the water. I have 2 fans hooked to a 12v adapter and it runs both fine.
 
I just finnished a project like this yesterday and i think it cost me a total of $60.00 US, I used 4 fans, two 3" fans blowing into the top, and two 4" fans blowing out of the top. I am hoping that the bigger fans will create low pressure inside the hood and in effect move more air.
The fans were about $8.00 each and i bought a 12v power supply from radio shack for $20.00 or so. Just make sure that the power supply has enough amps to push your fans. i will post a pict later today.

most comp fans have 3 wires, red, black, and yellow. The yellow is the sensor wire and you probably do not need it.

this was a very simple project.

this was for my 125 gal tank
 
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WOW almost $60, you could have went and bought a pre-made system for that. The reason I did it this way was the fact that it was so low cost for me. If I would have spent that much I would have just bought one that was already setup for the job. I guess that is just my thought. I hope it works good for ya. It does a great job for me when it isn't above 90d F.
 
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