Glossary of Industry Terms

Air Inlet – The designed port(s) of entry for combustion air in a controlled combustion, wood burning appliance.

Air Supply – Broadly, the air that is supplied to the firebox of the woodburning appliance.

Ash – Noncombustible solid byproduct of solid fuel combustion.

Baffle – An obstructing device or partition in a wood burning appliance, used to direct the flow of gases and heat.

BTU or British Thermal Unit – A measure of heat energy; the amount of heat required to raise the temperature of one pound of water one-degree Fahrenheit at sea level.

Burn Rate – Combustion rate, usually expressed in pounds of fuel consumed per hour.

Cap – Also called termination cap.  Covering for factory-built chimney that minimizes the effect of wind, and prevents entry of rain, snow, and debris into the chase.

Carbon Dioxide (CO2) – Colorless, odorless noncombustible gas produced by the complete combustion of carbonaceous fuel; is nontoxic.

Carbon Monoxide (CO) –  Colorless, odorless, combustible, and toxic gas produced by the incomplete combustion of carbonaceous fuel.

Catalytic Combustor – Device designed to increase combustion efficiency by lowering flue gas ignition temperatures.  Consists of substrate, washcoat, catalysts, and canning system.

Chase – A structure built around, and enclosing, portions of the chimney and in some cases, housing the appliance.

Chimney – A portion of the venting system, through which flue gases are vented to the outdoors and by which penetrated combustible surfaces are protected; a primarily vertical shaft enclosing at least one flue, the design of which results in a natural draft.

Clearances – Minimum distance which must be maintained between a heat source such as an appliance or vent and combustibles surfaces.

Combustible Material/Combustibles – Material made of or surfaced with wood, compressed paper, plant fibers, or other material that will ignite and burn, as applied to materials adjacent to or in contact with heat-producing appliances, chimney connectors, steam and hot water pipes and warm air ducts.  Such material shall be considered as combustible even though flame-proofed, fire retardant treated, or plastered.

Combustion – The process of burning, or oxidation accompanied by heat.  When sufficiently rapid, also accompanied by light.  Rapid oxidation of fuel gases accompanied by the production of heat, or heat and light.  Requires proper amounts of fuel, oxygen, and heat.

Combustion Ratio – Required amount of air that must mix with 1 cubic foot of gas to have complete combustion.

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