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<DIV><FONT face=Arial size=2><SPAN class=650574020-09052000>Does anyone have
experience with a variable speed drive on a centrifugal blower used in an
industrial vacuum system?</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN class=650574020-09052000>This is a 60 HP
machine that is never loaded beyond 40% (power) - even with an inlet bypass. Any
suggestions would be greatly appreciated.</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN class=650574020-09052000>The manufacturer has
been useless (they already sold the machine and apparently could care less about
making it more efficienct, although they did provide us with a performance
curve)</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=650574020-09052000></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN class=650574020-09052000>
<DIV><FONT color=#000000 face=Arial><FONT size=2>Mark E. Case,
P.E.</FONT></FONT><FONT size=2></FONT></DIV>
<DIV><FONT color=#000000 face=Arial><FONT size=2>President, </FONT></FONT><FONT
size=2><FONT color=#000000 face=Arial>etc Group, Inc.</FONT></FONT></DIV>
<DIV><FONT color=#000000 face=Arial><FONT size=2>3481 South 2300
East</FONT></FONT><FONT size=2></FONT></DIV>
<DIV><FONT color=#000000 face=Arial><FONT size=2>Salt Lake City, Utah
84109</FONT></FONT><FONT size=2></FONT></DIV>
<DIV><FONT color=#000000 face=Arial><FONT size=2>801-278-1927,
</FONT></FONT><FONT size=2><FONT color=#000000 face=Arial>801-278-1942
(F)</FONT></FONT></DIV></SPAN></FONT></DIV><PRE>
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