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4 | Chimney Requirements |
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A. Venting Systems
Chimney Connector:
It is also known as flue pipe or stove pipe. It must be 6 inches (152mm) minimum diameter stainless steel connector pipe.
Chimney:
The chimney can be new or existing, masonry or prefabricated and must meet the following minimum requirements as specified below.
WARNING! Risk of Fire!
Follow venting manufacturer’s clearances and instructions when installing venting system.
B. Inspections
Existing chimneys should be inspected and cleaned by a qualified professional prior to installation. The chimney must not have cracks, loose mortar or other signs of dete- rioration and blockage. Hearth & Home recommends a NFI or CSIA certified professional or a technician, under the direction of a certified professional, conduct a Level II inspection per NFPA 211.
WARNING
Fire Risk
Inspection of Chimney:
•Chimney must be in good condition.
•Meets minimum standard of NFPA 211
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C.Larger Chimneys
It is recommended that chimneys with larger diameters than 6 inches (152mm) be relined. An oversized flue
D. Masonry Chimney
•Must meet minimum standards of NFPA 211.
•Must have at least 5/8 inch (16mm) fireclay lining joined with refractory cement. (Installations into a clay flue without a stainless steel liner may reduce draw which affects performance, will cause the glass to darken and produce excessive creosote).
•The masonry wall of the chimney, if brick or modular block, must be a minimum of 4 inches (102mm) nominal thickness.
•A chimney of rubble stone must be at least 12 inches (305mm) thick.
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•Should be lined with a 6 inch (152mm) stainless steel flue liner to improve performance and reduce creosote
•An equivalent liner must be a listed chimney liner system or other approved material.
•No dilution air is allowed to enter the chimney.
1.Secure the fireplace damper in the open position. If this cannot be accomplished, it will be necessary to remove the damper
2.Seal damper area of chimney around chimney connector with a high temperature sealant or seal insert against the face of the fireplace.
3.Both methods must be removable and replaceable for cleaning and
•When possible, install an airtight
Minimum 1/2” (25mm) Air Space, | Minimum 5/8” (16mm) | |
Fireclay Flue Liner | ||
Maximum 4” (102mm) Air Space | ||
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Refractory Mortar
can affect draft and impair performance and will allow increased
NOTICE: Check with your local building authorities and/or consult the National Fire Protection Association (NFPA 211).
Airtight 
Footing (depth and size of footing accordance with local building code)
4“ (102mm) Masonry or Modular Block Wall (Nominal)
12” (305mm) if Rubble Stone Wall (Nominal)
Figure 14.1
Page 14 | April 21, 2010 |