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Backpuffing
Backpuffing is a condition that results when the draft is
too weak to pull flue gases out of the chimney system
as fast as the fire is generating more. Volatile gases
build up within the firebox until reaching a density and
temperature at which they ignite. With this ignition, you
may hear a muffled popping sound and see a bit of
smoke forced out of the air inlets.
This condition is most likely to occur in the spring or fall
when moderate outdoor temperatures and low intensity
fires combine to inhibit draft strength. If your stove
backpuffs, open the air inlets to induce a livelier fire
and speed airflow through the stove. Avid large loads
of firewood at one time. You should always see lively,
dancing flames in the firebox; a lazy, smoky fire is
inefficient and will promote draft problems.
Negative Pressure
Good draft also depends on a sufficient supply of air to
the stove. The chimney cannot pull more air than is
f i r e - p a r t s . c o m
available. Sluggish draft can be caused by a house
that is tight enough to prevent the ready flow of air to
the stove, or by competition between the stove and
other appliances that vent indoor air to the outside; i.e.,
exhaust fans for range hoods, clothes dryers, bath-
room, etc. If the chimney draws well when all such
30001586
Vermont Castings Seville Insert
equipment is turned off (or sealed, in case of the
fireplaces and/or other stoves), you simply need to be
attentive in timing the use of the other appliances. If
you need to crack a nearby window or door to enable
the chimney to pull well, you should install an outside
air intake to bring combustion air directly to the stove.
Consult your Vermont Castings Majestic Products
dealer regarding an adapter to attach to the stove to
connect an air duct for outdoor combustion air.
Conclusion
Woodburning is more an art than a science. Art in-
cludes technique and since installations, homes and
fuel vary, the stove operator must also vary technique,
(mostly timing), to achieve satisfying results. Over
time, you will become familiar with the intricacies and
nuances of your particular installation and you will be
able to identify cause and effect in a variety of sea-
sonal circumstances.
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