Inlet velocities for Centrifugal Fans
Inlet velocities for Centrifugal Fans
(OP)
What is a reasonable range for inlet velocities for the inlet of a centrifugal fan. My discharge velocity is about 2,850 fpm at 1" W.C. static pressure. Is an inlet velocity of over 4200 ft/min excessive?





RE: Inlet velocities for Centrifugal Fans
Check AMCA and ASHRAE for fan inlet conditions.
RE: Inlet velocities for Centrifugal Fans
Acceptable inlet velosity depends on density (temperature) of medium. What is application of the fan? Can you give more details of medium (temperature, density) and fan (inlet/outlet size, class, motor HP)?
regards,
curtis
RE: Inlet velocities for Centrifugal Fans
This is for a HVAC application, specifically for a Industrial Evaporative Cooler. Discharge pressures are low, about 1" w.c. static or less and using a size 36 I figure we need a 7.5 hp motor. The medium is air and we will be at STP, 0.067 lb/ft^3 at 70 F.
RE: Inlet velocities for Centrifugal Fans
Regards,
curtis
RE: Inlet velocities for Centrifugal Fans
It's an easy issue to resolve - check out the mfr. flow design vs. open inlet area of the fan provided...