Flue Gas Flow Calculator
Sizing Stacks, Fans, and Ductwork From Fuel Burn Rate
Downstream equipment — induced draft fans, ductwork, stacks, and pollution control equipment — all need to be sized for the actual flue gas flow rate a burner produces, not just its fuel consumption.
The Formula
Flue Gas Flow = Fuel Flow Rate × Flue Gas Volume per kg Fuel
Worked Example
A burner consuming 30 kg/hr of fuel producing 13 Nm3/kg:
Flow = 30 × 13 = 390 Nm3/hr
How to Use This Calculator
- Enter the Fuel Flow Rate in kg/hr.
- Enter the Flue Gas Volume produced per kg of fuel.
- Select Calculate to get flue gas flow in Nm3/hr.
Related Calculations
Need stack velocity from this flow? See the Stack Gas Velocity Calculator, or check total volume for a batch in the Flue Gas Volume Calculator.