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Small facility and ventilation, advice/input needed

Pour Decisions

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Working on my small facility plans and looking for more info regarding ventilation. My AHJ is pretty lenient but I want to make sure we are safe. I have an RKI PS2 unit that we'll install to alert us of any high levels. I planned to have a low cfm small in-wall fan unit that will be mounted around 24" from the floor to evacuate any gases and was planning a higher cfm in-wall fan to bring in fresh air. I'm at a loss as to how to calculate my ventilation needs. Do I need to match the cfm's on the two fan units to turn evenly over the airflow? For reference, my square footage is 675 and my still size is 150 gallons, so when I say small facility, yep, it's small!


Any input/recommendations?? 

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