Where can I find the ventilation/air exchange requirements for C1D1 rooms? Is there a standard? Under what code is it?
Check out Section 3.3.1 of 2017 NFPA 497 and its related sections that use the term. These would minimum rates. However under alarm indications of high concentration, a purging ventilation system is to be considered in the design.
You need to consult with a chemical engineer about the gases being used during normal operations and then go from there.
Milton, good info and I don't disagree w/you. But my experience has shown me that sometimes the AHJ/P.E. requires a different design. For instance, purge at 10% of LFL instead of 25% LFL. That is what we require here in FABULOUS Las Vegas - for marijuana extraction under butane method.
Nick I totally agree with you. There may be no national standardization of the ventilation rates for C1D1 rooms. But there are some recommendations from NFPA 497 that an engineer may consider for electrical safety. There is no best design that everyone could use. The ventilation rates can not be prescribed for a consistent national code enforcement without involving an engineered system for the particular room.
Perhaps a MEP firm with experience with C1D1 rooms should be retained for design and local building safety code compliance. A team of MEP engineers will research the best design according to the principles of engineering, and supply installers with the specifications they develop. As a result, engineers working in the MEP field must understand a broad range of disciplines, including dynamics, mechanics, fluids, thermodynamics, heat transfer, chemistry, electricity, and computer.
Wouldn’t it be great if we could just practice the engineering profession without interruption—just do the engineering, supervise the work and turn the system over to the owner?
But the law complicates things—and with good reason, of course. We apply for construction permits, inspections and certificates of occupancy for new construction and alterations. And our work requires review, during the design and construction, by an “authority having jurisdiction” (AHJ).
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