Originally Posted by
Michael Thomas
Exception: Where installed in accordance with the 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.
Michael,
Just verifying - that exception *does not* allow it to vent to the garage.
I raised my post / point of view not so much to answer your question, but to get you to consider those options (if you had not already done so) as they may be larger than 'just the micro wave venting into the garage'.