Insufficient Draft.
Insufficient draft will result in a loss of heat output and possibly some back-smok-
ing, especially when the fueling door is opened, Draft may be improved by increasing the height of the
chimney, or, in many cases, by resizing the chimney liner to match the diameter of the stove.
Intermittent Draft or Down Draft.
This type of draft is generally caused by wind patterns that are
moving downward as they pass the chimney outlet. There are a number of chimney caps available
that address this problem. Shared chimney liners should never be used.
The Coal Bed.
The coal bed in an anthracite stove must be several inches deep to ensure that there
is sufficient capture and radiation of heat to maintain combustion. It is also important that the coal bed
is of constant thickness. A hole or thin area will allow combustion air to bypass the rest of the coal
bed, and eventually the fire will go out. Do not add coal above the level of the fire brick or the steel
portion of the coal basket in the front of the stove.
Shake Down of Ash.
Shaking down of ash is required to maintain the flow of combustion air up
through the coal bed. When the coal bed thins and darkens, it is an indication that the grate is covered
with a thick layer of ash, and it is time to shake down, the shaking process also helps the hopper to
discharge additional coal into the basket. Once sparks begin to shower down, stop shaking. Excessive
shaking will waste fuel and add needless wear and tear to the grate system.
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