The undisputed benefits of using recombiners to reduce maintenance and improve safety have been recognized throughout Europe for over 50 years. In fact, the European Union standard UNE-EN IEC 62485-2 allows for a 50% reduction in ventilation when recombiners are installed in the cells in place of standard flame arrestors. It has not been until recently that recombiners have begun showing a presence here in the US and other countries outside of Europe.