[Trace-users] Appendix G Fan Power -

Mack Wallace mack at wisewatt.com
Wed May 12 15:40:32 PDT 2010


The CFM used in the 90.1 calculation is the CFM through the main coil for
the system.  Size the return/relief fans for 90% of this number or this
number less the minimum outdoor air which ever is larger.

Make the 90.1 calculation then check your fan selections against the allowed
HP.  This allowed horse power is the sum of all the fans that operate at
design.  That normally does not include relief fans or parallel fan box
fans.  According to ASHRAE fi an exhaust fan does not exhaust from the
building it is not counted either.


WiseWatt LLC
Mack Wallace PE, LEED AP
Executive Vice President
mobile - 214-535-5506
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