C1D1

C1D1 refers to National Electrical Code hazardous location classifications: Class I covers flammable gases or vapors, Division 1 means the hazardous concentration is expected under normal operating conditions. Solvent-based cannabis extraction (butane, propane hydrocarbon extraction in particular) triggers C1D1 requirements for the extraction room — explosion-proof electrical fixtures, specialized ventilation, and gas detection systems.

This is a building-suitability issue, not a licensing formality: retrofitting a conventional industrial or flex building to C1D1 standard is a real construction cost (often mid-to-high six figures depending on room size and existing electrical service), and it is a factor we screen for before recommending a building to a processor client or pricing a facility with existing extraction infrastructure as a selling point.

CO2 and ethanol extraction methods generally carry lower or different hazard classifications than hydrocarbon extraction, so the required build-out — and the value of an existing C1D1 room to a buyer — depends on which extraction method the buyer intends to run.