The math of 7 volting a fan.

Hey everyone. Considering I failed math I just wanted to check with you guys to make sure I was figuring this right. Okay word on the street is 7 volting a fan will generally make it run 20% quieter and at 80% of stock CFMs. So...

Stock Panflo 120mm: 41.5 dB-A and 103.8 CFM
41.5 dB-A * .2 = 8.3 dB-A
103.8 CFM * .8 = 83.04 CFM

Okay, that seems way to quiet. Did I do some math wrong or something?

20% quieter would be 80% of the loudness so the dba would be 33.2dba, not 8.3dba.

-Bobby

Cool, thanks man.

ok, now stop screwing with ur computer and do ur homework

Go here for a good article on dBA.

http://www.ocwarehouse.com/articles/db/

According to the formula:

(3^4.15) / (3^x) = 1.20 where 4.15 is your 41.5dBa, x= your dBA of your new fan and 1.2 is your 20% sound difference.

You will find that x = 39.8 dBA.

If you did have a fan that was 33.2 dBA you would find that the 41.5 dBA fan was:

(3^4.15) / (3^3.32) = 2.488 or 248% louder.

themodguy