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Working in Machinery Rooms Safety Alert (GN23)
Refrigerants that are heavier than air that leak into an unventilated area such as a basement they can accumulate and create an oxygen-deficient atmosphere leading to asphyxiation. This guidance note explains why the risks to persons are so substantial; key actions to prevent risk for those involved in maintenance and service activities.
4-page Safety Alert free download (originally issued in 2011, subject to review and minor revision 2020)