I have a very small lab which is 12' by 18' with 8' ceiling. My client would like to install some fume hoods inside there. Based on ASHRAE requirement, 10 air exchange per hour minimum is required in the lab area. If that is the case, the minimum supply and exhaust CFM is 288CFM. If I install two fume hoods there, the air flow will be around 3000CFM and the air exchange ratio will be more than 100!!! Theroically it should be ok but I think it will be too windy inside the lab. My question is: what is the maximum nominal air exchange rate in such a small area?
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