The Wärtsilä NOR units are selective catalytic reduction (SCR) converters that will meet the stringent requirements of IMO Tier III emissions control regulations with regard to NOX reduction. Wärtsilä has received an order from Edda Accomodation, which is part of the Østensjø Group in Norway, to supply six Wärtsilä Nitrogen Oxides Reducer (NOR) units for an accommodation vessel. They will be installed on the six nine-cylinder Wärtsilä 26 generating sets, which were ordered in the end of 2006 in addition to other auxiliary equipment and automation.