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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
HEATING SYSTEM INSPECTION
HOME HEATING SAFETY
ODORS & SMELLS DIAGNOSIS & CURE
SAFETY RECALLS CHIMNEYS VENTS HEATERS
STAIN DIAGNOSIS on BUILDING EXTERIORS
WOOD, COAL STOVES & FIREPLACES
WOOD STOVE SAFETY
This article describes 650-C chimneys, also called Super Chimneys designed for use with wood stoves and wood burning appliances. This article series on chimneys, chimney construction, and chimney safety provide detailed suggestions describing how to perform a thorough visual inspection of chimneys for safety and other defects. Chimney inspection methods and chimney repair methods are also discussed. Page top illustration of a 650-C chimney courtesy Carson Dunlop Associates.
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A 650-C Chimneys are required for use with wood burning stoves and, as Carson Dunlop's sketch explains, they have replaced Class A metal chimneys.
Type 650-C chimneys, also called Super Chimneys are tested for fire safety to 2000 deg.F. and provide an extra measure of fire safety.
Image at left: Selkirk 650C-rated insulated chimney installed using a cathedral ceiling support box.
650C chimneys, developed ca. 1983, are insulated and designed to withstand continuous flue gas temperatures of 650 degrees or less.
650-C chimneys are considered a suitable alternative to masonry chimneys used to vent woodstoves, heating appliances (boilers, furnaces, water heaters), and fireplaces.
Watch out: typically a 650-C chimney requires a 2-inch clearance to combustible framing or other combustibles. Depending on local building code approval, this distance can be reduced by appropriate heat shielding.
The 650-C or Super Chimnney is designed to resist corrosion both by its material and by the use of insulation that, by maintaining internal flue temperatures at a higher level (not as cooled by outside air) reduces the degree of condensation on the chimney flue interior.
Since Type A chimneys were discontinued for these applications after 1983 (to 1990 - citation needed), those venting systems are commonly replaced by a 650C chimney. [Type A chimneys do not have the same temperature tolerance and do not comply with current building codes in North America.]
Selkirk offers some important heating appliance and chimney safety advice concerning the 650C chimney illustrated above:
Definition of "Factory Built Chimney"
Super Chimney or 650C Chimney Product Sources & Standards
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Technical Reviewers & References
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