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6
87D0174
SSTB11 Woodburning Fireplace
FIREPLACE OPERATION
logs with ashes. A “banked” re will hold glowing coals for
8-10 hours, thereby saving a re for later use.
Wood vs. Fossil Fuels
Compared to fossil fuels, a full cord of dry hickory weighs
about two tons and is approximately equal in heating
value to a ton of hard coal. On a pound basis, heavy
hardwoods have about half the heating value of coal. The
tabulation shows the relative densities and heat values
of a variety of dry woods. Varieties at the top of the list
(Dogwood) burn longer and those near the bottom (White
Pine) ignite and burn quicker. A combination of both light
and heavy wood is desired.
Species Density Heat Value
Dogwood .70-.79 100-107
Hickory .70-.74 100
Oak .60-.73 86-99
Black Locust .69-.70 95-98
Beech .64-.66 89-91
Hard Maple .58-.65 83-88
Birch .55-.64 79-86
Apple .58-.6 83-84
Ash .57-.61 73-81
Southern Pine .51-.60 73-81
Elm .50-.59 71-80
Cherry .50-.5 70
Douglas Fir .45-.51 64-69
Spruce .41-.44 59
Redwood .33-.40 47-54
White Pine .35-.37 50
A Few Words of Caution
Beware of burning certain material in your replace.
Among these are plastics, poison ivy twigs and stems,
and chemically treated woods such as discarded poles
and railroad ties. These not only create air pollution, but
can induce extreme irritation for some individuals.
Use hemlock, spruce, juniper and other resinous woods
with caution. They contain moisture pockets which, upon
heating, “pop” with considerable vigor.
Always use a re screen. And always “bank” a re, or at
least push all unburned fuel to the rear of the grate before
leaving a re unattended. Do not use this replace as an
incinerator.
Because the termination of the chimney above the roof
is exposed to wind and cold and the pressure changes
these and other environmental conditions may cause, a
sufcient chimney draft may be hard to establish at times.
At other times the draft may be sufciently disrupted to
cause smoke to spill from the replace opening. If prob-
lems with chimney draft occur, help start chimney draft
before you build a re by holding a piece of burning paper
near the ue opening at the top of the rebox to preheat
the chimney. If smoke spills from the replace opening af-
ter the re is burning, open a window on the up wind side
of the house that is far enough away form the replace
that the wind will not blow across the replace opening,
push the burning wood as near the back of the replace
as possible, and if the replace is equipped with glass
doors, close them.
DO NOT LEAVE CHILDREN OR PHYSICALLY OR MEN-
TALLY HANDICAPPED, OR SENILE PERSONS ALONE
WITH A BURNING FIREPLACE.
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