NHSEI issued an Urgent Patient Safety Notice regarding the “Use of high flow oxygen therapy devices (including wall CPAP, and high flow face mask or nasal oxygen) during the Coronavirus epidemic” on 31 March 2020 (NHSE/I – 2020/001). The alert required immediate action from all hospitals to mitigate the risk posed by the use of multiple high flow devices, and highlighted “If the demand through multiple wall outlets exceeds the maximum capacity of the VIE delivery system, there is a risk of a rapid pressure drop in oxygen supply pipes.