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CHIMNEY INSPECTION DIAGNOSIS REPAIR
BACKDRAFTING HEATING EQUIPMENT
CARBON MONOXIDE - CO
CHIMNEY COMPONENT DEFINITIONS
CHIMNEY FIRE ACTION / PREVENTION
COMBUSTION GASES & PARTICLE HAZARDS
COMBUSTION PRODUCTS & IAQ
FLAME COLOR, BLUE vs YELLOW COMBUSTION
HOME HEATING SAFETY
Moisture / Frost Damaged Chimney
ODORS & SMELLS DIAGNOSIS & CURE
Safety Recalls, Chimneys, Vents, Heaters
STAIN DIAGNOSIS on BUILDING EXTERIORS
WOOD, COAL STOVES & FIREPLACES
WOOD STOVE SAFETY
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.
Define Flue: a flue is in most cases a synonym for chimney.
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 - Boilers, Furnaces 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.
Frequently Asked Questions (FAQs)
Questions & answers or comments about the different types of manufactured or metal chimneys, flues, flue vent connectors and other fireplace or heating appliance venting systems
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Technical Reviewers & References
Related Topics, found near the top of this page suggest articles closely related to this one.