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Old Feb 03, 2012, 11:20 AM
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Irvine, Calif USA
Joined Feb 1999
12,241 Posts
A tip with which I agree 100% from years of mounting, installing and running EDF's :

EDF sound has a lot to do with the way the fan is balanced, and mounted

"80% des Sounds eines Impellers liegen in der sauberen Wuchtung und Montage begründet. Deshalb bieten wir das an und sortieren die Antriebe auch paarweise auf Differenzen < 5%."

or :

"And another tip: 80% of the sound of a ducted fan are due to a clean installation and balancing. That is why we offer the sort and the drives in pairs with differences <5%."
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