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Old 04-25-2003, 02:33 AM   #21 (permalink)
 
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In regards to dB levels. it's been a while, but I almost positive on this. For every 3 dB of increased sound level, the human ear pertains things as twice as loud. So a 23 dB fan is twice as loud as a 20 dB fan. Still, when we're talking about these low levels, it's probably not perceivable.

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Old 04-25-2003, 03:51 AM   #22 (permalink)
 
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<BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR>Originally posted by mkam15:
<BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR>An idea is to get a variable voltage adapter. Something that rates 3-12 volts and atleast 255 mA. That way, you can run the fans slightly slower by selecting 10.5 volts (this would be quieter, but it also moves much less air this way) <HR></BLOCKQUOTE>

Would this be what you are talking about http://www.radioshack.com/product.as...id=273%2D1667#

Thanks.<HR></BLOCKQUOTE>

Yes, this is what I was referring to. You can still set it at 12 volts, but you always will have hte flexibility to use a lower voltage like 10.5 volts.

Actually, if you get that model, you'll still have 800 mA which is mor than enough(will still run up to 9 of those fans if you add more later), and you can always drop the voltage to 10.5 volts and you will save about $5 over the model I recomended.

What you selected is better in every way.

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Old 04-25-2003, 04:04 AM   #23 (permalink)
 
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How you set up the fans is totaly up to you. In my experience, it is best to set all the fans up blowing air out (exhausting). This is a general obpservation though. It truely depends on how you lighting fixtures/canopy are set up.

It really matters where your air leaks are in the canopy. If it's has alot of large air gaps all over the place, I'd put two on one end pulling air out and one fan on the opposite end blowing air in. If the canopy is fairly air tight, I'd put all three on the same end sucking air out and make a hole on the other end that is big enough to easily allow air to enter. Maybe a 4"x4" hole. or 2"x8" hole.

What you really have to do is look at your canopy and figure out how to best get the hot air out of your canopy.

Looking at your proposal, I'd actually do the exact oposite. I'd blow air in from the middle and have the two outside fans pull the air out. An option would be to add a fourth fan (which you could) and have two fans blowing in from the middle and each end having one exhause fan. That way, you would get good air movement and 54 CFM (cubic feet per minute) in and 54 CFM out. This would provide god air movement throughout your canopy.

<BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR>Originally posted by mkam15:
Thanks for the advise, so I need to get just one and use it on all three fans. Do I need to install anything else with the adapter? Like a adapter plug that I plug into the fan? I got the three pin connection on the fan.

i will definately give my results of the fans. I am installing them in a canopy that I am building for my 100 gallon tank.

Do you think two fans blowing in, and one fan blowing out would work? I am thinking about installing them in the back of the canopy and have two of them on each side blowing in and one in the middle blowing out. Just a thought. But thanks for the help. I will write if I need help.

Mike

[This message was edited by mkam15 on Thu April 24 2003 at 04:48 PM.]<HR></BLOCKQUOTE>

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Old 04-25-2003, 05:15 AM   #24 (permalink)
 
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I am going to have about 5" of open space on the back side of my canopy going across the whole back of the canopy. I was going to place the fans on the back side about 15" apart from one another. This will give circulation throughout my canopy. I don't want the fans on the side of canopy, I don't like how that looks. I also think with the fans in the back, they will be alot quieter then having them on sides. I am going to attach my ballasts to rear of the canopy. The top will fully open so I can get access to the tank. It is going to be 14" high, 12" off the tank with the lights hanging down 5" off the glass. The fans will be blowing directly on the lights and cooling them. I will post pictures when this is complete.
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Old 04-25-2003, 06:36 AM   #25 (permalink)
 
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AAhh, so there is a large opening in the back. 5" by 4 feet (assuming 4 feet due to 15" spacing). I would start by having all the fans actually pushing air into the canopy. That will cause air to circulate throughout the canopy. There will be plenty of gaps in the back to allow the air that is pushed in to be naturally pushed out.

IMHO, having all three fans push air in at the 15" gaps you mention would probably be the best way to keep things cool.

And I agree, keeping them in back will be quieter and more attractive.

<BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR>Originally posted by mkam15:
I am going to have about 5" of open space on the back side of my canopy going across the whole back of the canopy. I was going to place the fans on the back side about 15" apart from one another. This will give circulation throughout my canopy. I don't want the fans on the side of canopy, I don't like how that looks. I also think with the fans in the back, they will be alot quieter then having them on sides. I am going to attach my ballasts to rear of the canopy. The top will fully open so I can get access to the tank. It is going to be 14" high, 12" off the tank with the lights hanging down 5" off the glass. The fans will be blowing directly on the lights and cooling them. I will post pictures when this is complete.<HR></BLOCKQUOTE>

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Old 05-05-2003, 04:59 PM   #26 (permalink)
 
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Well, I just hooked up three 92 mm fansto the 3 to 12V Adapter and I could not even hear them. They are pushing a good amount of air. I did not install them into my hood yet, I am still working on the hood. If I knew that the fans were going to be this quiet, I would have order 2 more. I will keep everyone posted.
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Old 05-06-2003, 02:29 AM   #27 (permalink)
 
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<BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR>Originally posted by mkam15:
Well, I just hooked up three http://www.pcpowercooling.com/produc...an/index.htmto the http://www.radioshack.com/product.as...id=273%2D1667# and I could not even hear them. They are pushing a good amount of air. I did not install them into my hood yet, I am still working on the hood. If I knew that the fans were going to be this quiet, I would have order 2 more. I will keep everyone posted.<HR></BLOCKQUOTE>

This is VERY good news! I'm glad to hear that they are extemely quiet!

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Old 05-09-2003, 04:14 AM   #28 (permalink)
 
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mkam15,

Please be careful when you are putting these fans together. The instructions mentioned here are pretty good, but I'm not clear how much experience you have with wiring and electricity. I don't want to see anyone get hurt. You might want to ask your friends and see if anyone has any experience with wiring, lights, appliances, etc. There is some risk here, not the least of which is electricution (sp?). It is probably impossible to really hurt yourself with 12 volts, but it still exists. There is a much greater risk when working with any wiring that has 120 volts AC. You want to make sure that whenever you are working on the wiring that you have everything unplugged. That means from the wall or battery as well. In addition, you are working in a wet environment, this signficantly increases your risk. You should build and test everything away from you tank. Do NOT wire the lights and fans up while they are on top of the tank. Once you are done, double check your connections and make sure that the are well insulated, (wrapped with electrical tape or other means). If you are unfamiliar with electricity and wiring, please get help. There are more things I could write about safety, but that is for another tread. If you have questions please ask here, but it is your responsibility to decide what is safe, not the people who contribute here

For others that have contributed here, I think you have given solid advice, please feel free to comment about what I have said. I'm not trying to invalidate your contribution, I'm just concerned that there are people that will read this tread and possibly hurt themselves or their fish.

I appologize for not participating sooner. I've been working some crazy hours finishing a project.

Tony
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Old 05-09-2003, 05:42 AM   #29 (permalink)
 
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Tony,
We're glad to have you here.
I'll add a ditto to what you have reminded us. Reminders are always welcome. Sometimes those of us who have done these things regularly, take it for granted that we take special precautions everytime we do it. Since we comment and not write manuals the reminders should apply to us all.

James Hoftiezer

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Old 05-09-2003, 08:24 AM   #30 (permalink)
 
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Tony,
Thanks for the advice. I have already worked up and tested the fans. It was actually pretty easy. I have 6 92mm Silencer fans running off a 3 to 12 volt AC/DC adapter with a 800ma rating. I just cuting the adapter off the AC/DC adapter, figure out which was postive and negative, used a conection adaptor and hook all six fans up to the adapter. No problems. I used electrical tape to cover the connections and they work great. No sound, no sparks, no fire. I was pretty impressed on how easy it was. I will post pictures when the hood is completed. Sometime next week.
Once again, thanks for the advice and concerns.
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