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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
Single wall metal chimneys: this article describes Single-Wall Metal Vents and Chimneys, their Inspection, Diagnosis, Cleaning & Repairs.
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The single wall metal fireplace chimney shown at page top and shown again at below left was installed in a solid masonry fireplace in the 1960's. It can no longer be safely used because of the new construction in the left of the photo. As you can see at below right, a building addition constructed close to the original single wall metal chimney has left it too close to the new structure.
This chimney will need to be replaced with a modern insulated flue and extended in height. As long as the fireplace is not used, that corrective measure can be deferred.
Do not mistake this single-walled vent for a Type-L vent nor for a Type-B vent even though a hasty glance may make it look like one of those.
This vent appears to be single-walled aluminum and it has what looks almost like a coffee can installed as a rain cap.
If the metal chimney we see in this photo is being used to "vent" a water heater it is probably not working and probably lacks adequate draft. The result may be carbon monoxide release in the building.
The very tall single wall metal chimney shown at left is located on a building in Manhattan and was photographed from the Lotus Club. Several stories tall you can see that the chimney is braced about every 12-feet, and is askew, loose, and rusty. This chimey was so tall I could not photograph the entire structure in one image. As a single walled chimney in a cold climate venting gas fired equipment, one might question its venting efficacy. In turn, condensation from poor venting might be a factor in that rusting.
Single-wall metal pipes used to connect heating appliances to chimneys (metal or masonry) are discussed separately at Single-Wall Metal Flue Vent Connectors where we provide details about single wall metal flues and their fire clearance requirements.
Single wall metal pipes are also described in our table listing clearances by gas-fired appliance type at Listed Flue Vent Connectors for Gas Fired Heating Appliances.
Also see Metal Chimney Safety Alert - CPSC Document #5047.Readers of this section should also be sure to review details at FLUE VENT CONNECTORS, HEATING EQUIPMENT. 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.
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