HP SU-2A - Manual (Page 4)

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