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See STEP 2 on page 4. Static Pressure is the resistance to airflow (friction) caused by the air moving through a pipe, duct, hose, material. There is a variation of axial flow duct fan that uses a blower wheel instead of a propeller. It is. referred to as a Tubular Centrifugal. We do not make any tubular centrifugal fans at Cincinnati Fan.
How to Select a Fan or Blower. 1  STEP 1. From the table above, the conversion factor for 250Â° and 6500 ft. altitude is 1.71. 2  STEP 2. The corrected static pressure is: 7 WG x 1.71 = 11.97 inWG at standard conditions. Round off to 12 WG. 3  STEP 3. Select fan, using fan performance tables, for 1500 CFM at 12 WG.