Fan Cooling - RPM/Wiring help

[MatthewScars]

I just bought two 120mm 800RPM fans that I installed in my sump. I don't know much about volts/amps. Each fan is 12vDC .1amp.

I spliced in a power brick thats 12v and 1amp.

They run, but seem slow. I forgot how 800RPM/40CFM should feel like, but this is barely any output.

So question is, I just need to find a brick that is 12v and over .2 amps? You just add the ampage per fan and the volts stay the same? if I put a higher volt/amp brick on them will it burn them out?

 

[lfsmarineguy]

http://lmgtfy.com/?q=What+power+supply+should+I+use+for+2+120mm+800rpm+fans%3F

Couldn't resist . I don't think the results were helpful but the opportunity was there lol. I'm not sure on the answer but 40cfm on a 120mm isn't that intense so you might be working properly.

 

[MatthewScars]

http://lmgtfy.com/?q=What+power+supply+should+I+use+for+2+120mm+800rpm+fans%3F

Ah, turned that around on me, huh? hah.

I looked on RC but didnt fin anything on it that related to my exact question.

 

[lfsmarineguy]

You could always look for an adjustable fan control unit with multiple plugs for 120mm, some of them are pretty cheap.

 

[bad coffee]

Your math is correct.

Each fan takes .1A to work.

You have 2 fans, which means the total circuit is .2A

Your power supply provides up to 1A. You are using just 1/5th the power that your power brick will provide.

B

 

[bad coffee]

oh, you are wiring the fans in parallel, correct?

 

[MatthewScars]

oh, you are wiring the fans in parallel, correct?

Yeah, how does the voltage work? I need to use a DC12v box, or can I use a DC24v?

 

[ming]

Your math is correct.

Each fan takes .1A to work.

You have 2 fans, which means the total circuit is .2A

Your power supply provides up to 1A. You are using just 1/5th the power that your power brick will provide.

B

+1
And yes, 40CFM on a 120mm fan isn't a lot. It'll likely only feel like a small light breeze a few inches away

 

[ming]

Yeah, how does the voltage work? I need to use a DC12v box, or can I use a DC24v?

They're rated for 12v, so I'd stick to 12V. Running them at 24v will at best make them run twice as fast as they were built for, which will either burn them our early, or just burn them out instantly.

 

[MatthewScars]

Thanks guys, just ordered 2 of THESE. The 1900 RPM 110CFM version. Plus with the two 800RPM ones, gonna be crazy in the sump.

 

[lfsmarineguy]

I'm pretty sure most Scythe fans have a warning about avoiding humid environments. I forget who makes them but there are companies out there that produce fans that are more tolerant. I'll look around and see if I can find them again.