Enter the stack volumetric flow rate (ft^3/min) and the stack diameter (ft) into the Stack Exit Velocity Calculator. The calculator will evaluate the Stack Exit Velocity. 

Stack Exit Velocity Formula

The following two example problems outline the steps and information needed to calculate the Stack Exit Velocity.

SEV = VFR / (pi*D^2/4)

Variables:

  • SEV is the Stack Exit Velocity (ft/min)
  • VFR is the stack volumetric flow rate (ft^3/min) 
  • D is the stack diameter (ft) 

How to Calculate Stack Exit Velocity?

The following steps outline how to calculate the Stack Exit Velocity.


  1. First, determine the stack volumetric flow rate (ft^3/min). 
  2. Next, determine the stack diameter (ft). 
  3. Next, gather the formula from above = SEV = VFR / (pi*D^2/4).
  4. Finally, calculate the Stack Exit Velocity.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

stack volumetric flow rate (ft^3/min) = 300

stack diameter (ft) = 4

SEV = VFR / (pi*D^2/4) = ?