I am in the process of opening a Bar/Tavern in Oregon. I will streamline past details to start and can fill in any areas needed. Essentially I’m not required to have a hood system because the equipment I’m using is exempt based off UL 710B I believe is the code. However I’m told I need exhaust for heat and therefor make-up air, which is a challenge in my space. I only need about 400-500 CFMs based off the code math provided. My question is can I just use shutter fans that are about 10-12 inches and 800-1200 CFM fans for both exhaust and and make-up air, or do I have to have a “specific” make up air fan. How big of a duct would be required and what are the rules about them being around and near electrical meters when they expell from the building? I have read the code many times, but not being an engineer myself, I’m not able to make a good interpretation as my building inspector would. Keep in mind building is a 2story 10,000 SQF but I’m only in 2700 of it in lower level, and that means there is an “architect on file” that I have to present information to before inspector. It has made things very difficult cause inspector won’t amswer my questions directly, and architect doesn’t live in my town anymore so he can’t visually see opstacles. Any advice would be greatful. Thank You.