To summarize the vent codes:
IRC 2003 R303.3 Exception requires ventilation air from bathrooms be exhausted directly to the outside.
IRC 2003 M1501 requires clothes dryers to exhaust outside the building.
IRC 2003 M1502 prohibits range hoods from terminating in the attic.
- none of these have changed from IRC 2000, though the cfm requirements section is annotated as having changed. (Intermittant 100cfm for kitchens and 50cfm for baths in 2003)
Watch the UL listing on the bathroom fan duct, too- "air connectors" (as usually used for bathroom fans) are limited to 14', while "air duct" can be unlimited length.
[This message has been edited by SteveFehr (edited 10-22-2006).]
