Thanks to integrated eccentric rollers and/or the clean nozzles and rollers, the circular RRA diffuser offers a multitude of air direction choices. ... The design of the eccentric drum is registered in Canada (181973) and in U.S.A. (U.S.D.P. No D890, 325) NAD Klima 144, rue Léger Sherbrooke, (Qué) Canada J1L 1L9 Tel. : 819 780-0111