Application Notes How Do I Properly Size a Fan?

Providing mission critical components and subsystems since 1942. 620 East Dyer Road Santa Ana, California 92705-5697 Telephone (714) 540-1000 Facsimile (714) 545-9145 Visit us on the web at Application Notes How Do I Properly size a Fan? Proper sizing of fans and blowers involves determining many system factors and prioritizing them into requirements versus preferences. Some of these factors are the static pressure the fan must overcome, the average air flow volume required, the shape and direction of the desired air flow, space limitations, audible noise allowances, available power, efficiency, air density, and cost. The first two of these, air flow and static pressure, along with available power considerations are generally the most critical for system designers. These three address the fundamental questions how much air do I need and what is it going to cost in system power to get it?

(Bleier, 1998). The formula to define static pressure is: These formulas are used to determine critical parameters when selecting a fan. The fan

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