Maintaining truck and trailer fridge units has become a lot more challenging in recent years, thanks to the impact of environmental legislation, reports Steve Banner. The European Union's latest regulations on fluorinated greenhouse gases (EU 517/2014), in force since January 2015, means that all refrigeration systems on trucks and trailers must be inspected annually for leaks by an F-gas certified technician, says Carrier Transicold northern Europe managing director Scott Dargan.