are roof vent caps with dampers allowed for venting kitchen range hood exhaust fans in manufactured homes?
I thought the answer was no,,
but it appears to be Yes
check with your local building dept
This from the 2009 IRC: SECTION M1503RANGE HOODS
M1503.1 General. Range hoods shall discharge to the outdoors through a single-wall duct. The duct serving the hood shall have a smooth interior surface, shall be air tight and shall be equipped with a backdraft damper. Ducts serving range hoods shall not terminate in an attic or crawl space or areas inside the building.
Exception: Where installed in accordance with manufacturer's installation instructions, and where mechanical or natural ventilation is otherwise provided, listed and labeled ductless range hoods shall not be required to discharge to the outdoors.
Inspecting the Kitchen Exhaust - InterNACHI
Retrieving data ...