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CHIMNEY INSPECTION DIAGNOSIS REPAIR
BACKDRAFTING HEATING EQUIPMENT
CARBON MONOXIDE - CO
CHIMNEY CAP & CROWN
CHIMNEY CLEANING PROCEDURES
CHIMNEY COMPONENT DEFINITIONS
CHIMNEY CRACK DETECTION & DIAGNOSIS
CHIMNEY DRAFT & PERFORMANCE
CHIMNEY FIRE ACTION / PREVENTION
CHIMNEY HEIGHT & CLEARANCE CODE
CHIMNEY INSPECTION, FLUE INTERIOR
CHIMNEY LEANING, SEPARATION, MOVEMENT
CHIMNEY REPAIR METHODS
CHIMNEY STAINS & LEAKS
CHIMNEY TYPES & MATERIALS
DIRECT VENTS / SIDE WALL VENTS
DRAFT REGULATOR, DAMPER, BOOSTER
FIRE CLEARANCES INDOORS
FIREPLACES & HEARTHS
FLUE VENT CONNECTORS
MASONRY CHIMNEY GUIDE
METAL CHIMNEYS & FLUES
SAFETY RECALLS CHIMNEYS VENTS HEATERS
SOOT AT CHIMNEY TOP
STAIN DIAGNOSIS on BUILDING EXTERIORS
WOOD, COAL STOVES & FIREPLACES
This article defines the types of manufactured metal chimneys. We explain the difference between Class-A Chimneys, Metalbestos chimneys, Type B Vents, Type L Vents, Triple Wall metal chimneys, and Super Chimneys, 629 Chimneys, and 650-C Chimneys. Each of these chimney types has specific intended uses, fire clearances, and installation requirements.
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We give definitions of these terms just below, but beware: different people will use these words with different meanings.
Also see CHIMNEY TYPES & MATERIALS.
Definition of Chimney: a chimney is a passage through which smoke and combustion gases pass out of a building.
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A chimney may be made of masonry such as brick, stone, or concrete block. Depending on its age and local custom, the walls of a chimney may be thin - a single brick in thickness or thicker (safer) made of several bricks or made of masonry block or stone.
A chimney may also be lined with clay flue tile liners, asbestos-cement transite pipe, cement, metal, or flexible stainless steel.
A chimney may also be constructed of metal, such as a double-walled Metalbestos™ insulated chimney.
A masonry chimney (lined with transite pipe) and a metal chimney are shown here in Carson Dunlop's sketches.
Define Flue: a flue is in most cases a synonym for chimney.
A double-walled metal flue used for venting gas fired appliances in the U.S. and Canada is a Type-B vent. In some areas a single-walled vent might be used for gas-fired equipment such as a water heater.
A single-walled metal vent or a Type-B vent would be unsafe if used to vent a woodstove or oil-fired equipment.
A metal vent is shown here in Carson Dunlop's sketch.
Definition of Flue Vent Connector: a flue vent connector is a metal pipe used to connect a heating appliance such as a heating boiler or water heater to its chimney or vent.
Definition of Flue pipe and stack pipe - these are usually synonyms for flue vent connector. Generally a flue-vent connector is single-walled steel and must be routed with proper clearance from combustible materials.
See FLUE VENT CONNECTORS, HEATING EQUIPMENT for details about single wall metal flues and their fire clearance requirements.
Definition of Manufactured Chimneys
Manufactured chimneys of multiple metal walls or plastic have less weight than masonry chimneys and can be supported from the structure since they can deflect as the building moves with no problem. Readers should also see our more broad list of chimney types at CHIMNEY TYPES & MATERIALS.
Some segmented cementitious manufactured chimneys can be supported with a steel bracket bolted to reinforced joists to carry the weight.
Often manufactured chimneys are enclosed in a wood-framed and sided structure for cosmetic reasons.
List of Manufactured Metal Chimney Types
Here are the principal types of manufactured metal chimneys. We discuss each of these in the articles below.
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