RE: maximum duct velocity

From: <Christopher>
Date: Wed May 16 2001 - 10:19:00 EDT

>Here I have presented my problem in different way. Suppose I have a fan of
>20000 CFM air capacity.

That means your fan will move 20000 CFM without a restriction either on the inlet or outlet. If you put short inlet or outlet ducts that are the same diameter as the fan, you'll get your 20000 CFM. The minute you add some restriction, the pressure at the fan outlet goes up correspondingly and the flow rate goes down according to the delivery curve.

Christopher Wright P.E. |"They couldn't hit an elephant from <a href="/group/PipingDesign/post?postID=UbtzzGwY61luRWjGViX7XeKNLp6L1nKz8cmpWTB17DQ13d0DGeBLiPt63yzO7a-y2VBxmfCzuoDsxg">chrisw@skypoint.com</a> | this distance" (last words of Gen.

___________________________| John Sedgwick, Spotsylvania 1864)

<a href="http://www.skypoint.com/~chrisw">http://www.skypoint.com/~chrisw</a> Received on Wed May 16 10:19:00 2001