5
5055.552AS_040217-20
TN 20
Creosote
Formation and Need for Removal
When wood is burned slowly, it produces tar and other organic vapours, which combine with expelled moisture to form creosote.
The creosote vapours condense in the relatively cool chimney flue of a slow burning fire. As a result, creosote residue accumulates
on the flue lining. When ignited, this creosote makes an extremely hot fire.
The chimney connector and chimney should be inspected periodically (at least once every two months) during the heating season
to determine if a creosote buildup has occurred. If creosote has accumulated (3 mm. or more), it should be removed to reduce the
risk of a chimney fire.
1. Highest smoke densities occur when a large amount of wood is added to a bed of hot coals and the air inlet is closed. The
heated wood generates smoke, but without ample air, the smoke cannot burn. Smoke-free, clean burning requires leaving the
air inlet relatively wide open, especially during the first 10 to 30 minutes after each loading, when most of the smoke generating
reactions are occurring. After 30 minutes or once the wood is fully charred, the air inlet can be turned down substantially
without excessive smoke generation. Wood coals create very little creosote-producing smoke.
2. The cooler the surface over which the wood smoke is passing, the more creosote will be condensed. Wet or green wood contributes
significantly to creosote formation as the excess moisture that is boiled off cools the fire, making it difficult for the tars and
gases to ignite, thus creating dense smoke and poor combustion. This moisture-laden smoke cools the chimney, compounding
the problem by offering the smoke the ideal place to condense.
In summary, a certain amount of creosote is inevitable and must be lived with. Regular inspection and cleaning is the solution.
The use of dry, seasoned wood and ample combustion air will help to minimize the buildup.
Chimney Fires
Excessive creosote build-up can cause a chimney fire. Creosote comes from tar and organic vapours released from a slow burning
wood fire. Flammable creosote will condense and accumulate in the lining of a relatively cool chimney. When ignited, this creosote
can result in an extremely hot fire.
Avoiding a Chimney Fire
There are two ways to avoid chimney fires:
1. Keep your chimney clear of creosote build-up by cleaning your chimney before each burn season, and as necessary
(accumulations of 3 mm or more) during the season.
2. Burn clean, well-seasoned wood only (seasoned at least one year). Avoid wet or green wood.
3. Do not burn household trash, cardboard, plastics, construction lumber, treated or beach wood (as these will corrode your
fireplace and void your warranty).
4. Do not leave the air inlet wide-open for extended periods of time.
5. Keep a fire extinguisher handy.
6. Prepare a home evacuation plan with a place outside where everyone is to meet.
Содержание TN 20
Страница 16: ...16 5055 552AS_040217 20 TN 20 ...
