When the combustor has an exhaust temperature over 1400°
F. (760° C.) it can act like a glow plug (spontaneous combustion igniter).
Usually the wood gas-to air mixture is either too lean or
rich to form a highly flammable mixture. There are times when this mixture is
just right within the firebox during the normal burning process.
If the combustor is running at or above the ignition
temperature of the mixture, spontaneous combustion will result, causing the
stove to vent puffs of smoke.
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