A ventilation duct which ventilates a hazardous location has the classification of that location. Each fan for ventilation of a hazardous location must be nonsparking. [CGD 94-108, 61 FR 28285, June 4, 1996]
TL;DR
A ventilation duct which ventilates a hazardous location has the classification of that location. Each fan for ventilation of a hazardous location must be nonsparking.
Section 111.105-21 — full text
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