Variable Speed Drive Calculators for Fans

It is standard engineering practice to oversize fan capacities by at least 10% to accommodate unknown installation configurations. The over-capacity of a fan increases electrical operating costs. For example, a 10-horsepower fan reduced in speed by 10% will only use seven horsepower, or 30% less power.

• Fans - Variable Speed Drive CalculatorFan VSD Calculator
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Nameplate Horsepower	50	Enter a value between 1 and 10000 Required
Nameplate Efficiency	81%	select one 81% 84% 90% 92% Required
Motor Load at Fan	0.95	Enter a value between 0 and 1 Required
Annual operating hours	8000	Enter a value between 0 and 8760 Required
Existing Flow Control	Inlet Guide Vane, FC Fans	select one Inlet Guide Vane, FC Fans Inlet Guide Vane, BI & Airfoil Fans Inlet Damper Box Outlet Damper, FC Fans Outlet Damper, BI & Airfoil Fans Eddy Current Drives Required
Local Utility Rate ($/kWh)	.08	Enter a value between 0.050 and .500 Required

Fan Loading	select one High Fan Loading Low Fan Loading Required
Percent of Capacity (cfm)	Percent of Time at this Capacity
10%	%
20%	%
30%	%
40%	%
50%	%
60%	%
70%	%
80%	%
90%	%
100%	%
	The sum of Percent of Time at this Capacity must equal 100