I got dinged by the plan examiner for the first time, requiring an exhaust from each kitchen in an apartment project. I have done many multi-family residential rehabs and we have always installed recirculating hoods with charcoal filters in kitchens with operable windows. We have done this, because ducting a hood to the exterior is a nightmare in multi-family buildings, especially some I work on that are in urban neighborhoods with masonry bearing walls built to the property line.
It looks like IMC Table 403.3 footnote b and f are the relevant code sections. When I look at an older code (2003), I see that the wording of footnote b has not changed ("mechanical exhaust required..."), but it was not previously a footnote for kitchens, only bathrooms, smoking lounges, nail salons, etc...
I also see this is now a requirement in single family houses too: IRC 1507.3
One question though: is a hood even required? Seems like you could install a 100 CFM bathroom type vent in the ceiling and eliminate the hood and still meet code.
It looks like IMC Table 403.3 footnote b and f are the relevant code sections. When I look at an older code (2003), I see that the wording of footnote b has not changed ("mechanical exhaust required..."), but it was not previously a footnote for kitchens, only bathrooms, smoking lounges, nail salons, etc...
I also see this is now a requirement in single family houses too: IRC 1507.3
One question though: is a hood even required? Seems like you could install a 100 CFM bathroom type vent in the ceiling and eliminate the hood and still meet code.