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Inadequate wall thickness:
- Minimum thickness of firebrick is 2 inches
- Minimum thickness of unlined chimney is 8
inches
- Minimum thickness of lined chimneys is 4
inches
- Poor liner or firebox joints
- Separation of fireplace face and firebox
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| Improper chimney
height should be at least 15 feet high; top at least 2 foot
taller than any structure within 10 feet
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- Flue area should never be less than 1/12
of fireplace opening
- Damper installed too low
- Damper missing
- Fireplace too large for flue
- Inadequate draft
Lack of combustion air
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Chimney
Main Height
of Chimneys Brick
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Chimneys
Metal
Chimneys Backdrafting Vent
Connectors
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