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CHIMNEY INSPECTION DIAGNOSIS REPAIR
Abandoned Chimneys - Indoor Inspection
ABANDONED CHIMNEYS, OUTDOORS
Angled Chimney Flues
ARCHITECTURE & BUILDING COMPONENT ID
Attic Chimney Inspection
BACKDRAFTING HEATING EQUIPMENT
Blocked Chimney Flues
Bracket Chimney Collapse & Fire Risks
B-Vent Clearances Table
CARBON DIOXIDE - CO2
CARBON MONOXIDE - CO
CHIMNEY CAP & CROWN
CHIMNEY CHASE Construction & Defects
Chimney Cleaning Advice, Procedures
Chimney Cleaning Fraud Warning
CHIMNEY CLEANOUT DOORS
Chimney Components Definitions
CHIMNEY COLLAPSE Risks, Repairs
CHIMNEY CRACK DETECTION & DIAGNOSIS
Chimney Draft & Performance
CHIMNEY FIRE ACTION / PREVENTION
CHIMNEY FLASHING Mistakes & Leaks
CHIMNEY HEIGHT & CLEARANCE CODE
CHIMNEY HEIGHT EXTENSIONS
Chimney Inspection Checklist
CHIMNEY INSPECTION, FLUE INTERIOR CHIMNEY FLUE INSPECTION CAMERA
CHIMNEY INSPECTION INDOORS
CHIMNEY INSPECTION from GROUND
CHIMNEY INSPECTION at ROOFTOP
CHIMNEY LEANING, SEPARATION, MOVEMENT
CHIMNEY REPAIR FRAUD WARNING
CHIMNEY REPAIR METHODS
CHIMNEY SAFETY - CPSC Alert
CHIMNEY SHOULDER LEAKS
CHIMNEY SHROUD, Decorative
CHIMNEY STAINS & LEAKS
CHIMNEY TYPES & MATERIALS
COMBUSTION AIR DEFECTS
COMBUSTION AIR for TIGHT buildings
COMBUSTION GASES & PARTICLE HAZARDS
COMBUSTION PRODUCTS & IAQ
COMPLETE COMBUSTION, Stoichiometric
CREOSOTE FIRE HAZARDS
Curved Brick Chimneys - Sulphation
DEAD END CHIMNEY FLUE HAZARDS
DIRECT VENTS / SIDE WALL VENTS
DRAFT HOODS - gas fired
DRAFT MEASUREMENT, CHIMNEYS & FLUES
DRAFT REGULATORS, DAMPERS, BOOSTERS
EFFLORESCENCE, Salts & White / Brown Deposits
EMERGENCY RESPONSE, IAQ, GAS, MOLD
FIRE CLEARANCES INDOORS
FIRE CLEARANCES for MASONRY CHIMNEYSBR /> FIRE CLEARANCES, METAL CHIMNEYS
FIRE CLEARANCES, SINGLE WALL METAL FLUES & VENTS
FIRE CLEARANCE WOOD & COAL STOVE FLUES
FIREPLACES & HEARTHS
FIRE STOPPING in BUILDINGS
FLAME COLOR, BLUE vs YELLOW COMBUSTION
FLASHING, CHIMNEY Mistakes & Leaks
FLUE SIZE SPECIFICATIONS
Flue Separation Requirements
Flue Tile Damage in Chimneys
FLUE VENT CONNECTORS, HEATING EQUIPMENT
FUEL CHANGES for HEATING APPLIANCES
HEATING COST FUEL & BTU Cost Table
HEATING SYSTEM INSPECTION
HOME HEATING SAFETY
INDOOR AIR EMERGENCY RESPONSE
Lennox SAFETY WARNING
METAL CHIMNEYS & FLUES
NOISE / SOUND DIAGNOSIS & CURE
ODORS GASES SMELLS, DIAGNOSIS & CURE
ODORS FROM HEATING SYSTEMS
OIL HEAT SAFETY INSPECTIONS
PLASTIC Plexvent / Ultravent RECALL
ROOF STAINS from CHIMNEYS
SAFETY RECALLS CHIMNEYS VENTS HEATERS
SHARED CHIMNEY & FLUE HAZARDS
STAIN DIAGNOSIS on BUILDING EXTERIORS
STAINS on/near CHIMNEYS
Three-Sided Chimneys: Problems
TRANSITE PIPE CHIMNEYS & FLUES
UNLINED FLUE INSPECTIONS
WOOD, COAL STOVES & FIREPLACES
WOOD STOVE SAFETY
Metal chimney fire clearance codes & specifications: this article describes the basic fire clearance requirements for four types of manufactured metal chimneys: B-vents, L-vents, Class A chimneys, and 650C Chimneys.
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In addition to the requirement for safety fire clearance from rooftops and other building components, separate metal chimneys that are too close to one another may cause damage resulting in poor chimney performance or an unsafe chimney.
Carson Dunlop's sketch at left shows that metal chimneys should be at least 16 inches apart to avoid damage.
Sketch courtesy Carson Dunlop.
Other Key Articles on Chimney, Flue, & Vent Clearances for Fire Safety & Building Code Compliance
Reader Question: what's the code on distance and clearance for metalbestos chimneys & vents vs oil storage tanks?
I am installing a pellet boiler and will need a second metal chimney as I am leaving my oil burner as a backup. I live in maine. The only place I would like the metal asbestos chimney would run 40” away from my oil tank. Do you know what the code is on this? I am having a heck of a time getting any answers regarding this? - R. B. Windham ME 2/27/2014
Insulated metal chimneys typically require a one-inch clearance from combustibles.
I think the reason you're not finding an answer to your question is that we're mixing up different constraints and safety concerns:
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