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4
CHIMNEY REQUIREMENTS
The chimney should extend
at least 3’
above a flat roof or the highest roof ridge (see Fig.
2) and be free in a
radius of 30’
of objects such as tree limbs, other buildings, etc, which may
cause a down draft. The chimney should be lined as required by the local Gas Company or local
codes.
Some utilities require new chimney liners for all gas installations. Use a corrosion resistant
chimney liner (approved for gas service) of the same size as the vent pipe.
Fig. 2 Chimney and Fresh Air Dimensions