All gases, unless they contain sufficient oxygen, can kill by asphyxiation.

Enriched carbon dioxide atmospheres can be intoxicating. The risk from these hazards is increased in any location where there is inadequate ventilation, such as an enclosed or confined space. The Confined Spaces Regulations require that a suitable and sufficient risk assessment is carried out and appropriate controls are put in place, through a safe system of work, to protect those who are required to access a confined space.

Guidance Note 9 – The application of the confined spaces regulations to beverage dispense. Revision 3: 2020 can be downloaded from the publications area of the website.