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post #1 of 5 (permalink) Old 06-30-2016, 08:14 PM Thread Starter
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fans

installing 2 fans in canopy, does one blow in and one blow out
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post #2 of 5 (permalink) Old 06-30-2016, 08:21 PM
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I just made a canopy with 4 fans. You want all blowing in. You also want a hole in the top so the hot air can escape. I have no problem getting the tank to go from 83 degrees to 75 in a few hours. See this thread: https://www.plantedtank.net/forums/20...d-cooling.html

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post #3 of 5 (permalink) Old 07-02-2016, 12:08 AM
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In or out really makes no difference. What determines the direction is placement of the fans. You want cooler air coming in as close to the bottom as possible and hot air venting out the top. Sometimes fans aren't even needed if holes are located in such a way to allow natural airflow. Hot air leaving the top holes will draw cooler air in the bottom. Fans just help force more air movement. In summary, you want top mounted fans blowing up/or out , side mounted fans can blow in if exhaust holes are on top. If all holes are mounted on the sides, you can create a crossflow with one side blowing in and the other blowing out.


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post #4 of 5 (permalink) Old 07-02-2016, 12:14 AM
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Quote:
Originally Posted by sadchevy View Post
In or out really makes no difference. What determines the direction is placement of the fans. You want cooler air coming in as close to the bottom as possible and hot air venting out the top. Sometimes fans aren't even needed if holes are located in such a way to allow natural airflow. Hot air leaving the top holes will draw cooler air in the bottom. Fans just help force more air movement. In summary, you want top mounted fans blowing up/or out , side mounted fans can blow in if exhaust holes are on top. If all holes are mounted on the sides, you can create a crossflow with one side blowing in and the other blowing out.
The problem with fans blowing out is the moisture laden air (this is evaporative cooling) will cause premature failure of the fans. Keeping the fans blowing in eliminates this issue.

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post #5 of 5 (permalink) Old 07-02-2016, 02:18 PM
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I partially agree with the moisture laden air comment. If you are using 12v PC fans, the moisture laden air shouldn't be a concern, as they are a mag drive type of motor. Technically, if the windings on the coils are insulated good enough, they can run underwater. For example, most circulation pumps are built like this.
On the other hand, if you are using small 120v household fans, these will likely use a brush type motor. Which can be affected by the moisture more readily. But in all reality, if you are creating that much evaporation, you need to think about using a chiller and a good auto top off system.


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