CO 2 presents an asphyxiation hazard as it displaces oxygen. In the first image, you can see the monitor and the notification appliance for the room. All rooms that use or store CO 2 should be identified. Additionally, the extraction process utilizes other flammable liquids to further process the product. This also requires signage on the outside of the facility and room to identify the hazard. Extraction is closed loop (i.e. not open to the atmosphere) and under high pressure. Hazards can be present if there is a failure in operation releasing the CO 2 in the atmosphere.