Fireplaces and Wood Stoves
Wednesday, November 28th, 2007Inspection Insights
A typical fireplace consists of a firebox lined with firebrick (the area where the logs burn). The heat causes a draft that pulls the smoke up the flue, usually a tile or metal liner inside a masonry chimney. A damper regulates the draft and keeps air from escaping when the fireplace is not in use. A smoke shelf behind the damper prevents the outside air from pushing smoke into the house.
Gas Fireplace
This type of unit is mostly decorative and should always be operated with the damper open so carbon monoxide will vent up the chimney. A direct-vent version is available that does not require a chimney because CO is expelled out the rear.
Fireplace Insert
These units fit into an existing fireplace and work more like a wood stove. The space around the unit must be covered with sheet steel and sealed with cement grout or mortar. A flue liner must extend through the top of the chimney. This improves the draft, keeps the gases hotter (reducing creosote) and reduces the risk of flue gases seeping back into the house.
Wood Stove
A modern wood stove is more efficient than a heat-circulating fireplace. Advanced systems create conditions to burn combustible gases without the use of catalysts. With catalyst stoves, a ceramic honeycomb extracts heat from the flue gases. Pellet stoves use manufactured pellets that are fed into the combustion chamber.
Maintenance of a fireplace or wood stove:
* a stove will perform better if a one or two-inch layer of ash is left over the grates
* clean the chimney when creosote buildup reaches 1/8 inch, to prevent fires
* repair the firebox and masonry - any cracks wider than 1/64 inch pose a fire hazard
Safety Tips for Fireplaces and Wood Stoves
* Do not burn trash, Christmas trees, or wrappings.
* Do not burn pressure-treated or painted wood.
* Do not burn pine or other soft wood.
* Line old chimneys with tile or metal.
* Purchase only direct-vent fireplaces rated by the Underwriters’ Laboratories(UL), the American Gas Association (AGA), or the Canadian Gas Association(CGA).
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Contact the Jeffrey Team for more information - 416-388-1960