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Air does move from high to low and it does it by following the least resistive path. Because all fans are running at pretty much equal speeds they are each creating the same amount of pressure in their respective duct. When the ducts join the duct area is larger resulting in less static...

I just got some more data from the field - There are isolation dampers for each unit so that when the fan is off the damper closes. Currently 2 fans are running at 60% to maintain the .65" static. My technician performed a test by running all three fans at once. 2 of the fans ran at 42% and...

Currently 2 of the VFD's are running at 70% to handle the load. However this will increase as demand for cooling increases. All 3 use the same pressure sensor and setpoint. My goal is too come up with the most efficient way to run the system and get the customer to purchase the re-programming...

I have a customer who has 3 100hp 460vac motors that blow air into one common duct run. The system is controlled by maintaing static pressure of .65"WC in a 6' round duct. The motors are controlled by three different VFDs. What is the most cost effective way to run these motors? I believe...