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Boiler - Exhaust Velocity

Recommended boiler exhaust velocities.

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Exhaust Gas from BoilerRecommended Boiler Exhaust Velocity
Ducts at minimum load < 4.0 < 13
Stack at minimum load < 5.0 < 16
Boiler with one-step burner (on - off) 5.0 - 8.0 16 - 26
Boiler with two-step burner (high - low) 10 - 15 31 - 49
Boiler with modulating burner 15 - 25 49 - 82
To keep the surface free from soot the velocity should exceed 3.0 - 4.0 9.8 - 13
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Boiler house topics, fuels like oil, gas, coal, wood - chimneys, safety valves, tanks - combustion efficiency.

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