A silencer for a CPAP device comprises a housing assembly defining a flow path passing therethrough and including at least one of an inlet chamber, an acoustic chamber and a blower chamber. Each of the chambers has an inlet and an outlet for fluid communication therebetween. The silencer includes a combination...http://www.google.es/patents/US7789194?utm_source=gb-gplus-sharePatente US7789194 - Acoustic attenuation chamber
