DIY Fan hood - The Planted Tank Forum
 
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post #1 of 9 (permalink) Old 07-20-2005, 09:49 PM Thread Starter
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DIY Fan hood

Hey guys!
I was going to wire up some fans to my hood and read this article
https://www.plantedtank.net/diyhoodfan.html
From reading that, is it safe to assume you can any fan to any ac/dc adapter as long as the mA on the ac/dc adapter is more then the fan?
Also, Instead of wiring up 1 fan to 1 ac/dc adapter, I wanted to wire 2 fans to 1 ac/dc adapter. I bought 2 fans which are 225mA, 12V each. Would it be okay to wire them both to an adapter which is rated for 500mA, 12V?
Thanks!



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post #2 of 9 (permalink) Old 07-20-2005, 10:47 PM
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Yes, as long as the adapter is rated for more mA than the motor (or any device). The adapter's rating is more of a potential, and the motor is what determines current. It's the voltage that's important.

Wiring the 2 fans to 1 adapter is no problem either, since the cumulative current of the fans doesn't exceed the adapter. Just be sure to wire them in "parallel" and not in "series"
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post #3 of 9 (permalink) Old 07-21-2005, 02:28 AM Thread Starter
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Cool, Thanks!



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post #4 of 9 (permalink) Old 07-22-2005, 01:42 AM
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I installed mine with a separate switch for a pair.

that way I can turn them on and off as I choose, but I did find one thing really interesting.

In the winter months we are experiencing here in australia the amount of condensation forming on the hodd without the fans on is really scary. so they stay on 24/7 and have done so for 8 months now!


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post #5 of 9 (permalink) Old 07-29-2005, 12:50 AM
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I just thought of how some people say not to leave an adapter plugged in if it's not being used. Something about the transformer being damaged by being plugged in but no current being drawn. Anyways, if this is true, then I'd have concerns about using an adapter that's rated for a lot of current, but using a tiny fan that doesn't barely utilize it. However, I'm not sure if it is actually bad to leave them plugged in.

Either way though, your adapter is well matched to the fans, so don't worry.
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post #6 of 9 (permalink) Old 07-31-2005, 10:39 PM
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Yeah, I did essentially the same thing on my hood. I added a fan for each of my 55w PC bulbs and they are on a single switch so in the winter when I probably don't need them they can be left off. I would advise getting some decent fans that have a low dB rating unless noise doesn't really bother you. I used these http://www.silenxusa.com/productcart...8&idproduct=56 and couldn't be happier. They speed up automatically when the temp increases and the maximum is still only 14dB. Nearly inaudible unless I'm right next to the tank.

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post #7 of 9 (permalink) Old 08-01-2005, 03:15 AM
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Yeah same, I have twin 80mm silenX fans in mine.


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post #8 of 9 (permalink) Old 08-03-2005, 06:54 AM Thread Starter
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I rigged up my setup fans. I actually used an old ac/dc adapter from another electronic which was 9V and 1.4Amps. And I hooked 3 fans up to it, 2x225mA(Panaflo 92mm fan 56CFM) and 1x400mA(120mm). Works like a charm. I'll upgrade that to a 12V adapter if I find a spare one because I dont feel like paying for it when this works. The fans are rated at 35db which you can definately hear a hum, but its only on when the lights are on, not when I sleep. Because its on the same timer as my lights, I wont have the problem if being plugged in with no current being drawn because the current is stopped at the timer.



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post #9 of 9 (permalink) Old 08-10-2005, 02:02 AM
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Hi all, first post.

I have an AC fan on my DIY hood which I leave off in the winter time. But after reading Curare's post about condensation it has me thinking about small amounts of mould that grow in the hood in the winter time, most likely from a build up of condensation. I think I might consider leaving mine on all year, at least when the light timer is 'on'.

Can I connect an AC fan to a rheostat without harming the motor? I don't think that I want it on full bore in the winter, just enough to keep the air moving.
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