Home

WETT Glossary

WETT Glossary

Accessory a part capable of performing an independent function or functions, and/or contributing to the operation or aesthetics of the appliance or appliances that it serves.
Add-on (furnace or boiler) a solid fuel burning appliance designed to share the heat distribution system connected to an oil, gas, or electric appliance; the controls of the add-on are interconnected with the existing appliance.
Air Change Per Hour (ACH) the number of times in an hour that the total volume of air in a room or building is changed either by mechanical or by the natural infiltration of outdoor air into the room or building and ex filtration of indoor air to outdoors.
Air Circulating Blower consists of the complete blower assembly including the blower wheel (or fan), the blower housing, the motor and the drive used to circulate air through a forced air furnace and its duct system.
Air Exfiltration the leakage of air out of a building through cracks and crevices and other unintentional openings, caused by wind pressure and/or temperature difference.
Air-Fuel Ratio the weight of air per weight of fuel.
Air Infiltration the leakage of outdoor air into a building through cracks and crevices and other unintentional openings, caused by wind pressure and/or temperature difference.
Air Supply (in relation to the installation of an appliance) the total of combustion air, flue gas dilution air and ventilation air required for effective operation.
Combustion Air the air required for satisfactory combustion of fuel, including excess air.
Excess Air air admitted to the combustion chamber of an appliance that is in excess of that theoretically needed for complete oxidation of the reactive components of the fuel.
Flue Gas Dilution Air air admitted to an appliance or venting system to stabilize or neutralize the effect of the chimney draft on an appliance.
Primary Air that portion of the combustion air that is supplied for the initial stages of the combustion process and is supplied upstream from the point of ignition.
Secondary Air that portion of the combustion air that is supplied for the intermediate and final stages of the combustion process and is supplied downstream from the point of ignition.
Ventilation Air air admitted to a space containing an appliance to replace air exhausted through a ventilation opening or by of ex filtration.
Air Temperature Rise (produced by a forced air furnace) the difference in temperature between the average temperature of the air discharged from the hot air supply plenum, and the average temperature of the air entering the cold air return plenum.
Airtight Appliance (see Controlled Combustion)
Air-to-Air Heat Exchanger (see Heat Recovery Ventilator)
Appliance a device to convert the energy in fuel to useful heat, and includes all components, controls, wiring and piping required to be part of the device by the applicable standard.
Appliance, Automatically Controlled an appliance provided with a sensor or sensors that act to control heat output.
Appliance, Central Heating an appliance designed to supply heat to remote spaces by of ducts or water pipes.
Appliance, Free-standing an appliance intended for installation in a room in such a manner that it is exposed to the room on all sides, and intended to supply heat without ducts or water pipes.
Appliance, Manually Controlled an appliance not equipped to automatically regulate the rate of combustion.
Appliance, Space Heating an appliance designed to supply heat directly to the space in which it is located
by of radiation or convection.
Appliance Label (nameplate) a sheet of metal, foil, or other material permanently affixed to an appliance that displays the information required for installation and operation, and will bear the mark of the certification agency.
Aquastat a control used in Hydronic heating systems for sensing water temperatures, usually including operating and/or safety limit switching functions.
Ash the non-combustible residue of a coal or wood fire.
Atmospheric Pressure the weight of a column of air on a unit area at ground level extending from the earth to the upper level of the blanket of air surrounding the earth. This air exerts a pressure of 101.32 kilopascals (14.7 pounds per square inch) at sea level.
Authority Having Jurisdiction (see Regulatory Authority)
Backdrafting the emission of smoke and/or air through the openings of an appliance when a flow reversal occurs in the chimney, caused by wind conditions or negative pressure within the building.
Back Puffing the momentary emission of smoke through openings of an appliance when sufficient oxygen is admitted to an oxygen-starved fire to initiate the sudden ignition of combustible gases and a resultant sharp rise in the pressure within the appliance.
Baffle a stationary device used to divert the Row of fluid (air, water, steam) or flue gases, or to shield parts of an appliance from the effects of flame or heat.
Bank (the fire) the act offloading and arranging fuel into a wood or coal burning appliance to produce a long burn cycle.
Barrel Stove a steel drum or barrel converted to a stove by cutting holes and attaching a door, a flue collar and legs.
Biomass plant matter.
Blower Control (fan control) the temperature-actuated switch controlling the on-off operation of an air circulating lower.
Boiler an appliance intended to supply hot water or steam for space heating, domestic hot water, processing or power purposes.
Bonnet that part of a furnace casing which forms the supply plenum or to which the supply plenum is attached, usually used in reference to gravity furnaces.
Breech the hole at or near the base of a chimney for receiving flue gases.
Breech Pipe a short pipe with one end permanently mortared into the breech of a masonry chimney, and the other end for the attachment of a flue pipe. The flue gases come into contact with the breech pipe.
Briquette a relatively large pellet of densified coal dust, wood, or charcoal.
BTU (British Thermal Unit) the quantity of heat required to raise the temperature of one pound of water through one Fahrenheit degree.
BTU/h one BTU per hour
Burner, Atmospheric a device that does not use mechanical to force air into and/or out of a combustion chamber.
Burner, Power or Mechanical Draft a burner that uses mechanical to force air into and/or out of a combustion chamber.
Burn Cycle the time interval between the loading of a fuel charge on a bed of coals of a particular weight and the return of the fuel charge and coals to a coal bed of the same weight.
Burn Rate the weight of a fuel charge divided by the duration of the burn cycle.
Canadian Gas Association (CGA) a non-profit testing, certification and standards-writing agency located at 55 Scarsdale Road, Etobicoke, Ontario M3B 2R3.
Canadian Standards Association (CSA) a non-profit testing, certification and standards-writing agency.
Carbon Dioxide a non-toxic, non-combustible gas formed from the combination of carbon and oxygen during the combustion process.
Carbon Monoxide a [Toxic, combustible gas formed during combustion if the reaction is incomplete for any reason - for example, insufficient oxygen is present for complete combustion.
Catalytic Combustor a device designed to reduce the ignition temperature of the combustible constituents of the flue gas without itself being permanently altered by the combustion process.
Certified (Listed), as applied to appliances, components and accessories investigated (tested), and suitably marked with a label by a recognized testing agency as conforming to recognized standards, requirements, or accepted test reports.
Chimney a primarily vertical shaft enclosing at least one flue for conducting flue gases to the outdoors.
Chimney, Concrete or Masonry a field constructed chimney of brick, clay, stone, concrete or masonry units.
Chimney, Factory Built a chimney consisting entirely of factory made parts, each designed to be assembled with the other without requiring field fabrication.
Chimney Cap (Drip Cap, Crown) a cast in place or precast concrete unit, or stone unit surrounding the liner at the top of a masonry chimney designed to prevent the entry of rain and snow to the area between the masonry shell and the liner.
Chimney Capacity the maximum safe venting capability of a chimney, expressed in terms of the fuel consumption rate of connected appliances (in BTU/h or Kw) but more fundamentally related to the mass flow (for example, pounds or kilograms per minute) of flue gas that will flow up the chimney under given conditions of temperature and atmospheric pressure.
Chimney Connector the assembly of flue pipes that connects the flue collar of the appliance to the chimney flue, thimble or breech. (see Flue Pipe)
Chimney Effect (see Stack Effect)
Chimney Liner a heat and corrosion resistant conduit for flue gases inside a chimney.
Circulating Stove (see Stove, Circulating)
Clinker a lump of fused ash resulting from high temperatures combined with other factors.
Coal a solid fossil fuel composed mainly of carbon.
Anthracite a high grade hard coal, high in carbon content and low in volatiles.
Bituminous a medium grade soft coal having considerable volatile matter that is given off as a smoky gas when heated.
Lignite a soft brown to black low grade coal, frequently woody in appearance and high in moisture content.
Coke coal that has been heated to drive off volatile matter.
Combustible a material that is capable of taking fire and burning. As applied to a building material, it is that which fails to conform to ULC Standard CAN4-S114-78, Standard Method of Test for Determination of NonCombustibility in Building Materials.
Combustion the rapid oxidation of fuel accompanied by the production of heat, or heat and light.
Combustion Chamber a metal or refractory chamber located within the firebox of an appliance, and used to contain the burning fuel, heat and/or flame.
Combustion Products the constituents resulting from the combustion of fuel, including inert materials, but excluding excess air.
Condensate (condensation) the liquid that separates from gas or from combustion products as the temperature of the mixture falls.
Control an automatic, semi-automatic or manual device designed to regulate the operation of an appliance.
Convection the transfer of hear by the circulation of a fluid (air or water) caused by differences in temperature, and therefore in density.
Cook stove (see Range)
Corbel units of masonry projecting from, or stepping outward from, the face of a wall or chimney courses to form a support for a beam, rafter, chimney, chimney cap, or other member, or to form a sloping wall such as within the smoke chamber of a masonry fireplace.
Cord the common unit of measurement of firewood, equal to the gross volume of a stacked pile of wood measuring 1.2 m high x 1.2 m wide x 2.4 m long (4' x 4' x 8'). The amount of solid wood, excluding bark, in this 3.62 cubic meter (128 cubic foot) pile is usually between 2.0 and 2.4 cubic meters (71 and 85 cubic feet). Although the stacked cubic meter is the officially recognized unit of measurement (CSA Standard CAN 3-0302.1-M86), the solid cubic meter is used in Europe and in New Brunswick. Most firewood producers and consumers still use the cord.
Creosote the organic components of the flue gas, in solid or liquid form, which condenses in the appliance, flue pipe or flue.
Damper a movable plate or valve for regulating the flow of air or flue gas.
Check Damper a device that can be operated manually to reduce excessive draft through a heating appliance by admitting ambient air into the chimney connector downstream of the heating appliance.
Flue Gas Damper (Key Damper) a damper located in a chimney connector or in an appliance downstream of the combustion chamber.
Inlet Air Damper a damper arranged to control the air entering the combustion chamber.
Volume Damper a damper used to control air flow through a duct.
Degree Day (standard) a unit that is the difference between 18°C (65°F) and the daily average temperature when the latter is below 18°C (65°F). The degree days in one day are equal to the number of degrees that the average temperature for that day arc below 18°C (65°P).
Dew Point Temperature the temperature at which the water vapor in air will condense into water.
Diffusion Flame a flame into which oxygen is supplied separately from the fuel as opposed to premixed flame, in which the fuel gas and oxygen are mixed together before entering the combustion chamber.
Draft the potential for flow of air or combustion gases or both, through an appliance and its venting system. NOTE: Draft is indicated by the difference between the pressure at a specified point in the appliance or venting system and the pressure of the air at the same elevation outside the appliance or venting system.
Chimney Draft the available natural draft measured at or near the base of the chimney.
Forced Draft a mechanical draft created by a device upstream from the combustion zone of the appliance.
Induced Draft a mechanical draft created by a device downstream from the combustion zone of the appliance.
Mechanical Draft a draft created by a mechanical device such as a fan, blower, or aspirator.
Natural Draft draft other than mechanical draft.
Draft Control a control on the upstream or downstream side of the fire used to limit the air available to the fire.
Draft Regulator, Barometric a draft control device that functions automatically to prevent excessive draft in a fuel-burning appliance by admitting air to the venting system.
Efficiency (overall efficiency or appliance efficiency) the percentage of the total energy content of fuel consumed that is delivered to the space to be heated. Overall efficiency is calculated as follows: Efficiency = Eo x 100Et where Eo = usable energy output of appliance, and Et = total energy content of the fuel consumed (based on the higher heating value)
Efficiency, Combustion the percentage of the total energy content of a fuel consumed that is converted into heat energy.
Efficiency, Thermal or Heat Transfer the percentage of heat energy that is delivered to the space to be heated.
Emissions, Gaseous components of the flue gas in gaseous phase.
Emissions, Particulate components of the flue gas, in solid or liquid phase but excluding water, which exit the chimney serving an appliance.
Factory Built Appliance an appliance furnished by the manufacturer as a single assembly or as a packaged set of subassemblies or parts, and including all the essential components necessary for it to function normally when installed as intended.
Fines the dust and undersized pieces of processed fuel produced during handling.
Firebox an enclosure in which fuel or gaseous derivatives of fuel are burned.
Firebrick a refractory brick manufactured from clay that is highly resistant to heat and is used to line combustion chambers.
Fire Chamber the section of a fireplace in which fuel is burned, including the entire volume bounded by the hearth, chamber walls, and throat.
Fireclay (Refractory Cement) clay used for bonding refractory bricks or tiles; it withstands high temperatures without cracking or deforming.
Fireplace a device or construction assembly, usually of non-airtight design, for burning solid fuels having the major portion of one or more essentially vertical sides open or capable of being opened for refueling, and intended to permit visual observation of the Hames while the fuel is burning.
Fireplace, Circulating a fireplace with multiple wall construction that permits room air to circulate between these walls and discharge into the room either directly or via short ducts.
Fireplace, Factory Built a fire chamber and its chimney, consisting entirely of factory made parts designed for unit assembly without requiring field construction, commonly referred to as a zero clearance fireplace.
Fireplace, Factory Built Free-standing a device, usually of non-airtight design, for burning solid fuels, having all sides exposed to the room and having the major portion of one or more essentially vertical sides open or capable of being opened for refueling, and intended to permit the visual observation of the flames while the fuel is burning.
Fireplace Damper (Throat Damper) a damper used to control the flow of air and flue gases through a fireplace, usually located at the base of the chimney or smoke chamber.
Fireplace Insert a solid fuel fired heating appliance that is intended for installation within or partially within the fuel burning space of a masonry fireplace and that substantially closes off the fireplace opening.
Fireplace Liner a prefabricated steel form, sometimes manufactured in two layers to allow airflow around the fire chamber, used as an alternative to refractory brick for the fire chamber liner in a masonry fireplace.
Fire Resistance Rating the time in hours or fraction thereof that a material or assembly of materials will withstand the passage of flame and the transmission of heat when exposed to fire under specified conditions of test and performance criteria as prescribed in a code.
Fire Separation a construction assembly that acts as a barrier against the spread of fire.
Firesrop a draft-tight non-combustible barrier within or between construction assemblies that acts to retard the passage of smoke and flame.
Flame Spread Rating an index or classification indicating the rate of spread of flame on the surface of the material or an assembly of materials as determined in a standard fire test as prescribed in a code.
Floor Pad a non-combustible surface for ember protection applied to the floor area underneath and extending in front, to the sides and to the rear of a heat-producing appliance.
Floor Protection the shielding installed under a heating appliance to prevent overheating of a combustible floor.
Flue the passage in a chimney for conveying flue gases to the outdoors.
Flue Collar the portion of a fuel-fired appliance designed for the attachment of the Rue pipe.
Flue Gas combustion products and excess air.
Flue Liner a clay, ceramic, or metal conduit in a chimney intended to contain the combustion products and to protect the chimney shell from heat and corrosion.
Flue Outlet Pressure (Flue Outlet Draft) the pressure difference between the pressure at the flue outlet of the appliance and the pressure of the surrounding air.
Flue Pipe the metal pipe or assembly of pipes extending from the flue collar of an appliance to the chimney and forming the chimney connector.
Furnace an appliance intended for heating air and having provision for the attachment of ducts for the distribution of this air. (May also refer to the combustion section of a large boiler.)
Furnace, Combination, Multi-fuel a single furnace unit designed to burn more than one type of fuel or energy source (electricity, gas, oil or solid) either separately or simultaneously, using either separate or common combustion chambers and flues.
Furnace, Counter-Flow a furnace through which the circulating air is forced to Bow in the opposite direction to natural flow due to convection.
Furnace, Gravity a furnace in which the circulation of air is primarily by convection.
Furnace, Horizontal a furnace in which the circulating air flows horizontally with the air inlet and discharge openings at opposite ends of the casing.
Gasification the production of gas from a liquid or solid fuel.
Gas Vent the chimney used for venting a gas-burning appliance.
Gas Vent, Type B a certified gas vent that is round in cross-section, consists entirely of factory made parts (each designed to be assembled with the other without requiring field fabrication), and is intended for venting gas fired appliances approved for use with this type of vent.
Gas Vent, Type BW a certified gas vent that is oval in cross-section, consists entirely of factory made parts (each designed to be assembled with the other without requiring field fabrication), and is intended for venting only gas fired wall furnaces approved for use with this type of vent.
Grate a movable or stationary grid, usually of cast iron, on which solid fuel is burned, and which is designed to permit primary combustion air to enter the combustion chamber and/or to allow ashes to fall into an ash pan or pit.
Gravity Flow the movement of warm air or water through a heating system by convection rather than by fan or pump.
Grille a metal grating used to cover ventilation holes in walls or floors.
Hearth the Boor of a combustion chamber, more commonly, the floor of a fireplace.
Hearth Extension a non-combustible surface to protect the Roof in front and to the sides of a fireplace hearth.
Hearth mount Stove (hearth mount or hearth stove) a free-standing appliance intended for mounting on the hearth extension of a masonry fireplace and vented through the fireplace chimney
Heat Exchanger the enclosure that houses the flue gas passage(s) downstream of a combustion chamber and is designed for the transfer of heat from the burning fuel to air or water, or it may include all surfaces, including those of the firebox, from which heat is transferred within an appliance casing.
Heat Reclaimer a flue pipe mounted device to recover heat from the flue gases.
Heat Recovery Ventilator a mechanical ventilating device with an integral heat recovery system designed to provide fresh air to a building and exhaust contaminated and moisture laden air to the outdoors while reducing the heat loss normally associated with air changes.
Heating Value the amount of chemical energy in a specified quantity of fuel.
Higher Heating Value the total amount of chemical energy in a fuel.
Lower Heating Value the total amount of chemical energy in a fuel minus the latent heat of vaporization of any water that is formed from the combination of hydrogen in the fuel with oxygen.
Hydronic Heating System a fuel fired or electric heating system using water as the heated medium and plumbing for the distribution of heat.
Ignition the establishment of combustion or flame.
Ignition Temperature the lowest temperature at which combustion is self-sustaining.
Incinerator a device for the burning of combustible waste materials with little or no use being made of any resultant heat.
Infrared Radiation that part of the light spectrum that transfers heat energy and is converted into sensible heat when it strikes a solid object.
Insulating Brick low density (high porosity), low thermal conductivity firebrick intended for use in kilns and furnaces to reduce heat losses.
Joule the basic unit of work, energy or quantity of heat in the metric S1 system, being equivalent to 0.001055 BTU (I BTU ~ 1.055 KJ)
Labeled (see Certified)
Lintel, in reference to masonry fireplaces the horizontal member, usually masonry or steel, spanning the opening of a masonry fireplace, designed to support the masonry above.
Load bearing, as applied to a building element subjected to or designed to carry loads in addition to its own dead load.
Mantel a shelf or ornamental ledge above a fireplace opening.
Mobile Home a vehicular mobile structure built on a chassis designed to be used, with or without a permanent foundation, as a dwelling.
Mobile Home Appliance a system consisting of an appliance, combustion air and flue gas connections between the appliance and the outside atmosphere, supplied by the manufacturer, and constructed so that all air for combustion is obtained from the outdoors and all flue gases are discharged to the outdoors.
Modulation the infinite variance of the volume of the flow of fuel or air or both between predetermined minimum and maximum limits.
Non-combustible, as applied to a material that such material conforms to U LC Standard CAN4-S114- 78, Standard Method for Test for Determination of Non-Combustibility in Building Materials.
Oil Burner a device for supplying oil and combustion air.
OMNI- Test Laboratories Inc. a private testing and certification agency located at PO Box 743, Beaverton, Oregon 97075 U.S.A.
Operating Control a control used to regulate or control the normal operation of an appliance.
Oven Dry Wood wood that has been heated at about 103°C (217°P) until no further weight loss occurs and is defined as having zero moisture content.
Overfire Pressure (overfire draft) the difference between the pressure in the combustion chamber directly over the fire and the pressure of the surrounding air, the latter being used as the datum.
Particulate (see Emissions, Particulate)
Particulate Fuel those wood fuels that are intended to be used in particulate or divided form, the size of the individual particles falling within a prescribed range, and includes wood chips and pellets.
Peat the fossilized product of partial decay of plants and is a soft organic carboniferous material not in the coal stage.
Plenum a sheet metal box mounted on the outlet (supply plenum) or the inlet (return plenum) of a furnace and is intended for the connection of ducts.
Pressure Vessel a chamber designed to operate at pressures greater than 103.4 Kp (15 psig).
Primary Air (see Air Supply)
Primary Heating Surface the surfaces of those portions of the heat exchanger exposed to direct radiation from the fire or combustion chamber, including that portion which encloses the combustion chamber.
Process Application the application of heat for other than space heating or domestic water heating.
Propane a hydrocarbon fuel composed of95% or more propane (C3Hs), propylene (C3HG), or a mixture of both as classified in CGA Standard B149.2, Installation Code for Propane Burning Appliances and Equipment.
Pyrolysis the chemical decomposition of wood or coal by the application of heat alone, in the absence of oxygen.
Radiation (see Infrared Radiation)
Rafter a framing member that supports the roof and usually encloses an attic space, but does not support the ceiling.
Rain Cap a metal or masonry cap mounted above the top of a chimney flue liner designed to prevent the entry of rain and snow into the flue and, in some cases, to affect draft in the chimney.
Range an appliance equipped with a cooking surface, which may have one or more ovens.
Refractory any solid ceramic material suitable for use as a structural and/or protective material for high temperature and corrosive environments.
Register a grille with integral dampers placed in walls, floors and ceilings used to adjust the flow and diffuse air entering a room from a duct.
Regulatory Authority a federal/provincial! municipal ministry, department, board, agency or commission that has responsibility for regulating by statute the use of products, materials or services.
Return Duct or Pipe a duct or pipe for conveying air or water from a space being heated, ventilated or air conditioned back to the heating, ventilating or air conditioning appliance.
Room Heater (see Space Heater)
Safety Control System a system of automatic controls that is intended to automatically prevent unsafe operation of the controlled equipment, and may include relays, switches and other auxiliary equipment and interconnecting circuitry.
Safety Limit Control a control intended to prevent unsafe conditions of temperature, pressure or liquid levels.
Seasoned Wood wood that has lost a significant amount of its original (green) moisture. The term has no quantitative or universally accepted meaning.
Secondary Heating Surface the surfaces of those portions of the heat exchanger conveying the combustion products or Rue gases from the enclosure forming the primary heating surfaces to the flue outlet.
Sensible Heat the form of energy that can be sensed or felt directly by human skin.
Service Water Heater an appliance intended for heating of domestic water (as distinct from water for space heating).
Smoke Chamber the chamber in a fireplace immediately above the throat and smoke shelf, and below the chimney flue.
Smoke Detector device for sensing the presence of visible or invisible particles produced by combustion, and for automatically initiating an alarm.
Smoke Pipe (see Flue Pipe)
Smoke Leakage Test a procedure for detecting leakage in a masonry chimney flue or deterioration or breaks in the integrity of a factory built or metal chimney flue, and involves igniting a smoke bomb or building a smoky fire in a fuel burning appliance, covering the chimney termination, and checking for smoke leakage through chimney walls.
Smoke Test, Flue Gas a procedure for determining the completeness of combustion in an oil burning appliance by drawing a flue gas sample through a filter paper and comparing the color density of the deposit to the Shell Bacharach smoke spot scale from 0 to 9, 0 being white and 9 being black.
Soot a soft, black, velvety deposit of carbon particles in appliances, chimneys or flue pipes.
Space Heater (Room Heater) an appliance for heating the room or space within which it is located, without the use of ducts.
Spark Arrester a screen or other device, usually part of a rain cap, to prevent sparks, embers or other burning material from being expelled to the atmosphere.
Stack Effect the tendency of warm air or gas to rise within a vertical space or conduit because it is lighter than the cooler air outside the space or conduit.
Stoker an automatic fuel feed device connected to a heating appliance.
Stove an appliance intended for space heating, or for space heating and cooking.
Stovepipe (see Flue Pipe)
Supply Duct or Pipe a duct or pipe for conveying air or water from a heating, ventilating or air conditioning appliance to a space to be heated, ventilated or air conditioned.
Sustained Yield the annual rate at which biomass can be harvested from a geographical area for an infinite period of time.
Temperature Rise the measured temperature of an object minus a reference temperature (usually the average air temperature or a temperature considered to be the starting point for a test).
Thermostat an automatic control for regulating temperature by controlling a heating or cooling source and/or the distribution of the heated or cooled medium.
Thimble a masonry or metal sleeve of constant inside diameter through which the flue pipe passes to reach the chimney flue. The flue gases do not come in contact with the thimble.
Throat the narrow passage in a fireplace between the firebox and smoke chamber. Throat is the inside radius of an elbow.
Underwriters' Laboratories Inc. (UL) a non-profit standards-writing and certification agency having no corporate connection with ULC.
Underwriters' Laboratories of Canada, (ULC) a nonprofit standards-writing and certification agency located at 7 Crouse Road, Scarborough, Ontario MIR 3A9.
Unit Heater a suspended space heater with an integral air-circulating fan that is intended for the heating of nonresidential space in which it is installed.
Vent Connector that part of the venting system that conducts the flue gases or vent gases from the flue collar of a gas-fired appliance to the chimney or gas vent, and may include a draft control device.
Ventilation the process of supplying outdoor air and/or removing contaminated indoor air by natural or mechanical to and from any space.
Venting the removal of Hue gases to the outdoors by of building openings or venting systems.
Vented Appliance an appliance provided with a flue collar to accommodate a venting system for conveying flue gases to the outdoors.
Volatile Matter the vapors and tar droplets, mostly hydrocarbons, that are driven off when coal or wood is heated.
Warnock Hersey Professional Services a private testing and certification agency located at 211 Schoolhouse Street, Coquitlam, BC V3K 4X9.
Ventilation the process of supplying outdoor air and/or removing contaminated indoor air by natural or mechanical to and from any space.
Venting the removal of fIue gases to the outdoors by of building openings or venting systems.
Vented Appliance an appliance provided with a flue collar to accommodate a venting system for conveying flue gases to the outdoors.
Volatile Matter the vapors and tar droplets, mostly hydrocarbons, that are driven off when coal or wood is heated.
Warnock Hersey Professional Services a private testing and certification agency located at 211 Schoolhouse Street, Coquitlam, BC V3K 4X9.
Wythe refers to the front to back depth of a single wall of bricks or blocks; a wall consisting of two layers of 4" bricks would be an 81h" double Wythe wall.
Bookmark/Search this post with