Originally Posted by
Jerry McCarthy
This may help?
http://http://www.inspectionnews.net...clearances.gif
Actually, that confuses the matter.
David posted the code (for 2003 I think).
This is the 2006 IRC code.
-
G2427.6.4 (503.6.4) Gas vent termination. A gas vent shall terminate in accordance with one of the following:
- - 1. Gas vents that are 12 inches (305 mm) or less in size and located not less than 8 feet (2438 mm) from a vertical wall or similar obstruction shall terminate above the roof in accordance with Figure G2427.6.4. (Jerry's note: See chart for heights. Unlike the drawing posted, the distance for gas vents is 8 feet.)
- - 2. Gas vents that are over 12 inches (305 mm) in size or are located less than 8 feet (2438 mm) from a vertical wall or similar obstruction shall terminate not less than 2 feet (610 mm) above the highest point where they pass through the roof and not less than 2 feet (610 mm) above any portion of a building within 10 feet (3048 mm) horizontally. (Jerry's note: Note the "or", which means this also applies to 1. above. Now, once the 8 foot dimension has not been achieved, the 10 foot dimension kicks in - making it a tad more complex ... if you are 8 feet away, no problemo, however, if you are 2 feet from a side wall, not only must the gas vent stick up 2 feet higher than the roof above, it must also stick up high enough so it is 2 feet higher than that upper roof where within 10 feet of the gas vent. ANY SIZE gas vent.)
- - 3. As provided for direct-vent systems in Section G2427.2.1.
- - 4. As provided for appliances with integral vents in Section G2427.2.2.
- - 5. As provided for mechanical draft systems in Section G2427.3.3.
Note that the last part of 2. also applies to 1. - because of the "or".