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We are doing a build out of a distillery that will occupy approximately 600 sq feet within a 13,000 sq foot building that is F-1 occupancy. The consulting engineers believe we need to classify the area which then kicks in special placement and sealing of electrical services. I have found several tidbits on the web that tell me this is not true as long as adequate ventilation is present. From reading various items it seems that adequate ventilation means 6 air changes per hour, or 1 CFM per square foot of floor area used for storage. The requirement is to keep the vapor concentration from exceeding 25% of the Lower Flammable Limit. This is new building and the air exchange would be around 3200 cfm. We have sprinklers throughout and will not exceed 240 gallons of storage, which is our MAQ. The total square footage of storage space will be approximately 30 square feet. All storage will be done in 55 gallon stainless steel barrels. There are no walls within the 13,000 square feet. We will have two 125 gallon electric stills. From both a code stand point as well as a “real life” safety stand point I do not think we need to be classified. One of the points the consulting engineers bring up is: How can we determine there will be no pooling of the vapors that would exceed 25% of the LFL? My first thought is to run a floor fan 24/7/365 to disperse any potential pooling but if there is another common sense approach I’d like to hear it. Any ideas of how not to be classified are appreciated