There is, as you stated, a general formula for an enclosed, hood or box-type work area (125 CFM per sq. ft. of opening). The problem is you are using a funnel-type capture system. That makes things more complicated as you are not capturing the fumes as effectively. You will need more CFM. If you switch to an enclosed hood or box-type work area, you can calculate the necessary CFM very easily.
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Lenora
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