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Blower Design
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Posted by: Marky

09/27/2006, 09:29:27

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I have a Fan/Blower design that I need help with. My customer is mounting (8) 4" Sq fans (100cfm each) side by side mounted inside a long rectangular metal box...no extra cowling or duct work.

The box cover has (8) 4" dia. cutouts as the output.

If I measure airflow at the output...should I expect an 800 cfm reading or 8 separate readings of 100cfm?

I think the later, and should incorporate a plenum at the output so that the all 8 fan outputs have a combined cfm rating.

Please let me know what you think.

Thanks








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Re: Blower Design
Re: Blower Design -- Marky Post Reply Top of thread Forum
Posted by: garitc

10/04/2006, 15:10:31

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The later is correct. You must consider the installation for loses also. Be careful measuring as any restriction created by the measuring equipment will result in a loss of flow or a lower measurement. Straighten (4x duct cross section should do)the air before measuring using a flow hood or pitot tube.







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