Sizing a Range Exhaust Vent Fan
So how many CFM should the fan that vents a cooktop be? I’ve done an exhaustive search of the GBA archives, and there’s lots of articles for sizing the makeup air to the vent fan, but nothing I’ve been able to find that helps you decide how big the fan itself should be. Most of what I’ve found on the Internet lacks any sort of analytic rigor, and just depends on rules of thumb, like 1 CFM for every 10 BTU’s for gas, or 10 CFM for every inch of width for electric. (Which incidentally both drive you toward around 300 CFM).
Is there anything more science-based?
GBA Detail Library
A collection of one thousand construction details organized by climate and house part