View Single Post
Old Feb 03, 2012, 11:20 AM
Herb is offline
Find More Posts by Herb
Lithium Member
Herb's Avatar
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%."

http://translate.google.com/translat...peller&act=url
Herb is offline Find More Posts by Herb