We had an inspector write up a manifold room because the exhaust fan motor was inside the room with the medical gas cylinders. Obviously they can’t have a medical air compressor and cylinder manifolds in the same enclosure, but I never thought of this situation as an issue until now.
Reference:
NFPA 99, 2018, 5.1.3.3.4.2 Cylinders, whether full or empty, shall not be stored in enclosures containing motor-driven machinery, …