Swegon: duct system pressure and SFP

The duct system pressure drop has a significant impact on the SFP. But what are the factors we need to focus on when reducing SFP? Lets take a closer look at that.
 
Specific fan power, SFP, is the total electrical power of the fans in an air handling unit in kW divided by the supply air flow or the exhaust air flow depending on which of them is the largest.