Our explainationis as follows:
As previously indicated, non-flammable medical gas cylinders cannot be comingled with; flammable materials, cylinders containing flammable gases, or containers containing flammable liquids. Typical flammable gases may include but are not limited to: Acetylene, Butane, Ammonia, Ethane, and Propane. This prohibition is outlined in NFPA 99-2012; 188.8.131.52.4.
Medical gas cylinders are also not allowed to be stored in an enclosure containing motor driven devices with the exception of cylinders intended for instrument air reserve headers that must comply with NFPA 99-2012; 184.108.40.206.5. This reference can be found at NFPA 99-2012; 220.127.116.11.4.2