An estimated three quarters of currently operating National Hockey League (NHL) ice arenas were built in the mid-1990s. In addition to these larger arenas, there are thousands more private, community, and locally owned rinks across North America. Many of these rinks are much older and are nearing, if not well past, the expected usable lifetime of the refrigeration systems that enable ice making.
source https://www.achrnews.com/articles/140395-smart-refrigerant-selection-for-ice-rinks
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