[Kopi]

I'm on the Noctua site looking at some fans...they claim these specs

Size 120x120x25 mm
Bearing SSO-Bearing
Blade Geometry Straight-Blade-Design
Rotational Speed (+/- 10%) 1200 RPM
Rotational Speed with U.L.N.A. 600 RPM
Airflow 81 m³/h
Airflow with U.L.N.A. 41 m³/h
Acoustical Noise 17 dB(A)
Acoustical Noise with U.L.N.A. < 6* dB(A)

So I'm looking at 17-23dba with how many CFM? I have no clue how to convert that...the relation works out to

1 meter = 3.2808399 feet
1h = 60minute..duhh...

So would I multiply 40, or 80 by 3.2808399 and divide by 60? That gives me like 4cfm.. haha
__________________

 

[The Duke]

Does area cubed come to mind

 

[Kopi]

No, should it

 

[The Duke]

Try...
http://www.sciencemadesimple.net/volume.php
link corected

Airflow with U.L.N.A. 41 m³/h
cubed

 

[tankman12]

http://www.engineeringtoolbox.com/fl...ter-d_405.html

 

[Kopi]

Its cubed though, not square...
ah thanks tank, so its onyl like 50cfm :<

 

[slow'puter]

47.43 CFM = 81 m^3/h

 

[The Duke]

Quote:

Originally Posted by tankman12 http://www.engineeringtoolbox.com/fl...ter-d_405.html

Sweet, you rule

Quote:

Originally Posted by slow'puter 47.43 CFM = 81 m^3/h

You too

 

[t4ct1c47]

Quote:

Originally Posted by Kopi Airflow 81 m³/h

I hope I worked it out right;

81 x (3.2808399 x 3.2808399 x 3.2808399) / 60 = Airflow 47.67CFM

 

[Kopi]

Yep, you did it by hand but a machine just told me the same thing...i was really hoping these fans would be near 80 though

 

[tankman12]

No problem...

 

[Sreenath]

Quote:

Originally Posted by t4ct1c47 I hope I worked it out right; 81 x (3.2808399 x 3.2808399 x 3.2808399) / 60 = Airflow 47.67CFM

yep thats how you do it. its around 50cfm

 

[Sreenath]

Quote:

Originally Posted by tankman12 171612cfm

you multiplied by 60 not divided.

 

[tankman12]

Quote:

Originally Posted by Sreenath you multiplied by 60 not divided.

I realized that. Was doing it in my head before I looked at the site.