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Delta fan fan-club. - Page 11

post #101 of 233
Soon to be a member with four AFB1212GHEs for chassis cooling and another on the CPU.

Quiet? Who needs quiet? I'll just stick the computer in another room with really long cables and let it fly around.
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post #102 of 233
Hey anyone know what the CFM or air pressure would read when my 2 Delta AFC1212D PWMs are spinning at 1900rpm? I've got them on Qfan (Asus P6x58D Premium), both running off of a 4 pin Y splitter, plugged into the CPU Fan port.

Also, I feel my silverstone 1200mm fan on my FT02 sort of impedes airflow when the Deltas are really spinning... anyone think it's better to replace/remove my exhaust fan?

Thanks guys... loving the forum here.
post #103 of 233
Quote:
Originally Posted by phillydee View Post
Hey anyone know what the CFM or air pressure would read when my 2 Delta AFC1212D PWMs are spinning at 1900rpm? I've got them on Qfan (Asus P6x58D Premium), both running off of a 4 pin Y splitter, plugged into the CPU Fan port.

Also, I feel my silverstone 1200mm fan on my FT02 sort of impedes airflow when the Deltas are really spinning... anyone think it's better to replace/remove my exhaust fan?

Thanks guys... loving the forum here.
Well at 100% it's:
3400 RPM
113 CFM
10.98 mmH20

SO 1900 RPM would be ~56%
So you're looking at ~ 60CFM & 6.2mmH20
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post #104 of 233
right... numbers don't lie I was trying to find a graph somewhere on line with readouts to see where the sweetspot was for best airflow to noise etc. but right now it's working like a dream so I'm happy.
post #105 of 233
Quote:
Originally Posted by phillydee View Post
right... numbers don't lie I was trying to find a graph somewhere on line with readouts to see where the sweetspot was for best airflow to noise etc. but right now it's working like a dream so I'm happy.
dBA at that level should be around 25dBA or so. Since I didn't list it I figured you might wanna know.

The normal value is 46.5dBA

This was all rough math in my head; you can get exact numbers by using a calculator and multiplying the normal (100% value) by 56% or .56
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post #106 of 233
Quote:
Originally Posted by Tator Tot View Post
dBA at that level should be around 25dBA or so. Since I didn't list it I figured you might wanna know.

The normal value is 46.5dBA

This was all rough math in my head; you can get exact numbers by using a calculator and multiplying the normal (100% value) by 56% or .56
I think you may be mistaken since decibels aren't linear. A noise half as loud would be roughtly 36dBA, not 25. This is because approx. every 10dBA means a noise doubles in strength.
post #107 of 233
Quote:
Originally Posted by groundzero9 View Post
I think you may be mistaken since decibels aren't linear. A noise half as loud would be roughtly 36dBA, not 25. This is because approx. every 10dBA means a noise doubles in strength.
Sound Pressure Level in dB is mostly linear to RPM levels.
It's not always 1:1 and that's why I did say "25dBA or so." I'm not saying it's gonna be a 100% accurate measurement.
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post #108 of 233
well, I only needed approximates... at 1920rpm the hum is slightly less than my case hum, and wondered if the volume of air the fans were pushing were exceeding the air that my Silverstone fan was pulling out. Also first time using deltas and pulse width modulation to control fan speed, and didn't know if the CFM, pressure, and dB followed in linear scale according to rpm.
post #109 of 233
Quote:
Originally Posted by phillydee View Post
well, I only needed approximates... at 1920rpm the hum is slightly less than my case hum, and wondered if the volume of air the fans were pushing were exceeding the air that my Silverstone fan was pulling out. Also first time using deltas and pulse width modulation to control fan speed, and didn't know if the CFM, pressure, and dB followed in linear scale according to rpm.
What I've done with my two cases is to remove the rear grill and do without an exhaust fan. Works great.
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post #110 of 233
Could you update mine to 9xFFB1212EHE? I'm not using the FFB0612EHEs anymore.
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