Removing Ashes; Air Intake Control; Fire Types; Flash Fire - HearthStone WFP-75 8411 Manuel D'installation Et D'utilisation

Report prepared for Guillaume Thibodeau-Fortin (Stove Builder International Inc.) on
6/8/2020 7:48:41 AM
MANUAL INSTALLATION AND OPERATION WFP-75 8411 ENGLISH
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5.5

Removing Ashes

Ash should be removed from the firebox every two to three days of full time heating. Ash
should not accumulate excessively in the firebox since it will affect the proper operation of
the appliance.The best time to remove ash is in the morning, after an overnight fire when the
fireplace is relatively cold, but there is still a little chimney draft to draw the ash dust into the
fireplace and prevent going out into the room.
Ashes almost always contain live embers that can stay hot for days and which release carbon
monoxide gas. Ashes should be placed in a tightly covered metal container. The container
must be placed on a non-combustible floor or on the ground well away from all combustible
materials. If the ashes are disposed of by burial in soil or otherwise locally dispersed, they
should be kept in a closed metal container until they are completely cooled. No other waste
should be placed in this container.
5.6

Air Intake Control

Once the firewood, firebox and chimney are hot, air intake can be
reduced to achieve a steady burn.
As the air intake is reduced, the burn rate decreases. This has the
effect of distributing the thermal energy of the fuel over a longer
period of time. In addition, the flow rate of exhaust through the
appliance and flue pipe slows down, which increases the duration
of the energy transfer of the exhaust gases. As the air intake is
reduced, the flame slows down.
If the flames diminish to the point of disappearing, the air intake
has been reduced too early in the combustion cycle or the wood
used is too wet. If the wood is dry and the air control is used
properly, the flames should decrease, but remain bright and stable.
On the other hand, too much air can make the fire uncontrollable, creating very high temperatures
in the unit as well as in the chimney and seriously damaging them. A reddish glow on the unit
and on the chimney components indicates overheating. Excessive temperatures can cause a
chimney fire.
5.7

Fire Types

Using the air intake control is not the only way to match the fireplace heat output to the desired
temperature in the house. A house will need far less heating in October than in January to
maintain a comfortable temperature. Filling the firebox full in fall weather will overheat the space.
Otherwise, the combustion rate will have to be reduced to a minimum and the fire will be smoky
and inefficient. Here are some suggestions for building fires suitable for different heating needs.
5.7.1

Flash Fire

To build a small fire that will produce a low heat output, use small pieces of firewood and load
them crisscross in the firebox. The pieces should only be 3" (76 mm) to 4" (102 mm) in diameter.
After raking the coals, lay two pieces parallel to each other diagonally in the firebox and lay two
more across them in the other direction. Open the air control fully and only reduce the air after
the wood is fully flaming.
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Stove Builder International Inc. | 46345 | Rev: Apr 13 2020 12:33PM | Uncontrolled Copy
WFP-75 8411
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