Fan Noise

[globaldesigns]

Originally Posted by Black Phantom

I'm good with the computer fan idea but correct me if i'm wrong. I have to convert 120 Volt AC to 12 Volt DC. There's no room in the unit to accomodate any kind of transformer to step down the voltage. The issue is there are three power cords coming into the light. One for the MH bulb, one for the Actinic and one for the lunar lights.
There's really no room to put in anything else.

My fan is the right connection for the unit (12V), basically the little rectangle plug that is stock with computer fans. My fan that came stock in it is a Sunon. I doubt yours is running at 120V, but yeah you need to verify this.

[Black Phantom]

Originally Posted by globaldesigns

i doubt yours is running at 120v, but yeah you need to verify this.

Don't doubt it. I'm pretty good at the electrical stuff and my fancy little multimeter shows a line voltage of 120.
The fans are a fairly cheap unit manufactured in China. The problem is they are a five blade unit so they are making up the lack of air volume by running at high RPM.
The better computer fans are running 7 or more blades and are designed for more volume with less speed.
So what I need is at least 7 blades running around 1800 RPM or less.
I can try rheostat the present fan but I'm worried if I slow it down it will overheat.
Thats my problem

[globaldesigns]

Originally Posted by Black Phantom

Don't doubt it. I'm pretty good at the electrical stuff and my fancy little multimeter shows a line voltage of 120.
The fans are a fairly cheap unit manufactured in China. The problem is they are a five blade unit so they are making up the lack of air volume by running at high RPM.
The better computer fans are running 7 or more blades and are designed for more volume with less speed.
So what I need is at least 7 blades running around 1800 RPM or less.
I can try rheostat the present fan but I'm worried if I slow it down it will overheat.
Thats my problem

Well, meters don't lie... Maybe see what the manufacturer will charge for a replacement... Usually they don't gouge that much for parts. Then you don't have to fuss around with something not made for it.

Here is a link to show you the cost, very cheap overall: http://www.aquariumpart.com/Coralife...Parts_s/34.htm, I would give Kevin @ Red Coral a call, he most likely can get one in for you. If not then try Dennis @ Golds

[Black Phantom]

Thanks for the link. Sorry, I should have been more specific at the beginning. The fan I have is running ok (just loud). I pulled it out as I assumed it would be a simple thing to locate another fan. "wrong"
I might just put it back in and run my MH earlier in the day. Then run my Actinics and Lunar lights after 6.
The fan only runs when the MH are on.