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4.7.4 COMBUSTION AIR
This appliance needs air for safe operation and must be installed in such a way that adequate combustion air is available.
4.7.5 ADDING VENT SECTIONS
Add chimney sections, according to the manufacturers installation instructions. The chimney must extend at least, 3 feet above its point of contact with the roof and at least 2 feet higher than any wall, roof, building or obstacle within 10 feet horizontally.
3FT MIN
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2 FT MIN | 2 FT |
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RIDGE MIN | 3 FT | |
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FLAT ROOF 
WALL
59.1A
