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North America: Ice rinks and the phaseout of HCFC-22.

Retrofits in Minnesota and Michigan provide examples of good options.
According to the International Ice Hockey Federation (FIH), there are 1,800 indoor ice rinks depending on refrigeration for their ice in the USA, and 3 250 ice rinks in Canada. The most recent ones generally use ammonia as their refrigerant, but many older ice rink systems can still contain thousand...

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