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non-hazardous area adjacent to Division 2 classified area

non-hazardous area adjacent to Division 2 classified area

non-hazardous area adjacent to Division 2 classified area

(OP)
We are working on a project with a small engine shop located in a corner of a large highbay warehouse.  I finally argued the architect into putting a fire-rated wall around the engine shop, pointing out that it falls under NFPA 30A repair garages, and gasoline could be spilled, making it a Division 2 area to 18" AFF.  

They put a door from the shop into the warehouse.  NFPA 30A states that areas adjacent to classified areas are non-hazardous if they are ventilated to 4 AC/HR.  In such a warehouse, that would be a LOT of ventilation.  Does this door trigger classifying the entire warehouse Div 2 to 18"?  That seems kind of excessive, but it also looks like that is the letter of the code.  

SparksRfun

"The truth will set you free, but first it will make you madder than a wet bobcat"  

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