Recommended boiler exhaust velocities.
|Exhaust Gas from Boiler||Recommended Boiler Exhaust Velocity|
|Ducts at minimum load
|Stack at minimum load
|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
Boiler house topics, fuels like oil, gas, coal, wood - chimneys, safety valves, tanks - combustion efficiency.
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