m³/h --> CFM

23851 Views 13 Replies 6 Participants Last post by tankman12, Jul 4, 2007

Kopi

Discussion Starter · Jul 4, 2007

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
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The Duke

· #2 · Jul 4, 2007

Does area cubed come to mind

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Kopi

Discussion Starter · #3 · Jul 4, 2007

No, should it

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The Duke

· #4 · Jul 4, 2007

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

Airflow with U.L.N.A. 41 mÂ³/h
cubed

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tankman12

· #5 · Jul 4, 2007

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

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Kopi

Discussion Starter · #6 · Jul 4, 2007

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

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slow'puter

· #7 · Jul 4, 2007

47.43 CFM = 81 m^3/h

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The Duke

· #8 · Jul 4, 2007

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

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t4ct1c47

· #9 · Jul 4, 2007

Quote:

Originally Posted by Kopi

Airflow 81 mÂ³/h

I hope I worked it out right;

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

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Kopi

Discussion Starter · #10 · Jul 4, 2007

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

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tankman12

· #11 · Jul 4, 2007

No problem...

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Sreenath

· #12 · Jul 4, 2007

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

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Sreenath

· #13 · Jul 4, 2007

Quote:

Originally Posted by tankman12

171612cfm

you multiplied by 60 not divided.

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tankman12

· #14 · Jul 4, 2007

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.

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