I know local jurisdictions will come into play, but this is bothering me.
We have a large, open warehouse-style space that is heated/cooled by rooftop package units. No ducting. They just blow air into and out of the space. Is it okay to use exposed riser cable? It doesn't seem like the space is a plenum, but it is technically "air-handling space". I just can't find any reliable information about this.
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