It's not unusual to discover humidity around the S/A diffusers while in the kitchens as a consequence of larger rh problems condensing drinking water vapor from the massive MUA load. As soon as the hood has become correctly sized, the cfm is calculated according to code standards or UL tests. https://restaurantandbarventilati00863.widblog.com/84578010/everything-about-restaurant-and-bar-ventilation