Glossary

Air Wash

As primary air enters the firebox it is pre-heated and directed towards the glass at the top of the front door.  The constant washing of warm air over the glass helps keep soot and creosote from building up on the glass of wood burning appliances.

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Baffle

A device or partition in a solid fuel appliance, used to direct air and heat.

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Baffle Plate

A partition inside a solid fuel appliance to control the direction of combustion air, flames or flue gases.

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BTU’s

British Thermal Unit is the amount of energy it takes to heat one pint of water one degree Fahrenheit.

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Catalytic Combustor

A coated ceramic honeycomb used on some stoves and high efficient fireplaces to reduce flue gas emissions.

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Chase

A structure built around and enclosing portions of chimney exterior to the house.

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Clearance

The lab tested distance that is calculated and measured as a minimum distance an appliance or part of the appliance can be placed adjacent to a combustible surface INCLUDING drywall.

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Coaxial Venting System

A direct vent system using a smaller pipe within a larger pipe.  Inner pipe exhausts gases and outer pipe for fresh air intake.

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Colinear Venting System

A direct vent system using two separate liners, one is for exhaust gases and other for fresh air intake, running together through an existing chimney system.

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Combustible Material

Material made of or surfaced with wood, compressed paper, plant fibers, plastics or other material that can ignite and burn whether flame proofed or not.  Drywall and Fire proof drywall are combustible material.

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Convection

The distribution of heat by air.  Warmed air rises and circulates.

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Cookstove

Wood burning appliance with a separate fire chamber and intended primarily for cooking.  Cookstoves include an oven and often have optional water reservoirs and warming shelves.

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Creosote

Deposits of condensed wood smoke in the chimney resulting from incomplete combustion.

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Damper

A moveable or rotating plate used to control flow of air, smoke and draft.

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Direct Spark Ignition

A type of electronic pilot ignition. It ignites the gas directly at the burner from a spark.

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Direct Vent

A venting system where all combustion air is drawn from outside and all flue gases are vented to the outside.

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Draft

The pressure difference between warm inside air and cool outside air.

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Efficiency

Return of heat into the room vs heat venting out the chimney/vent.

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Emissions

Unburned gases and smoke left after combustion vented outside the house.

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Factory Built Fireplace

A fireplace constructed of metal and entirely of listed manufactured components.  Often called Zero Clearance fireplaces, they are designed to be assembled in accordance with the terms of the listing and installed with its approved factory built chimney.

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Factory Built Chimney

A chimney constructed entirely of listed manufactured components and designed to be assembled as an entire system.

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Flue

A passageway for moving flue gases from combustion devices to the outdoors such as vent or chimney systems.

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Gas Logs

An open flame appliance that uses fabricated logs over a burner to provide a realistic and dramatic flame.

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Gasket

A seal used to create an air tight barrier. Found around glass, doors, and various components of wood and gas fireplaces, stoves & inserts.

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Grate

A metal frame used to hold burning logs in a fireplace, usually constructed of heavy steel or iron.

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Gravity Vent

Venting that uses natural draft.

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Hearth

Traditionally refers to the floor of a firebox where a fire is built and sometimes used to describe floor extending in front of the firebox.  This term is often used today to reference the fireplace and stove industry.

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Hearth Extension

A non-combustible surface extending in front of and beyond each side of the firebox opening.

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Hearth Pad

A noncombustible floor protector which a wood burning stove is set on.

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Heat Shield

A non combustible protector used around appliances, smoke pipe or chimney to protect combustible from heat.  Heat shields are often built into or available options on most wood stoves.

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Hot Surface Ignition

Type of electric (intermittent) ignition system used to ignite main burner.

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Intermittent Ignition System

Uses Electronic Spark or Hot Surface Ignition to light pilot or burner on demand.

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Incomplete Combustion

Improper air to fuel mixture, or inadequate temperatures resulting in less than complete burning of fuel.

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K Value

Indicates the amount of BTUs of heat that will flow in one hour through on square foot of a uniform material one inch thick for each degree Fahrenheit of temperature rise.

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Kindling

Small, thin dry pieces of wood used to start a wood fire.

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Listed

Indicates the equipment meets recognized safety standards and is included in a list published by a recognized testing laboratory or inspection agency.

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Mantle

An ornamental facing surround the firebox usually consisting of legs, breast and shelf.  Mantles can be manufactured with materials such as wood, plaster, stone or concrete.

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Masonry Chimney

Is constructed on site of masonry and fire clay material; construction is according to specified code.

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Non Combustible Material

Material when used as intended under anticipated conditions will not ignite, burn, support combustion or release flammable vapors when subjected to fire or heat.

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Pilot

A small flame used to ignite the main burner.  May be standing or intermittent.

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R-Value

Is Resistance Value and is a measure of how resistant a substance is to transferring heat.

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Radiation

The transfer of heat via radiant energy.

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Sealed Combustion System

Direct vent systems are self contained combustion systems where all combustion air is drawn from outside and combustion product is vented to the outside.

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Seasoned

Term used to describe wood that has been allowed to dry before used for burning.  Seasoning takes 6 – 12 months.

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Soot

Soft black or brown velvety deposits of carbon particles. Originates in oxygen poor flames.

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Zero-Clearance Fireplace

See Factory Built Fireplace.

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