Abstract: A respiratory mask comprises a mask body and a filter system. The filter system includes a replaceable filter cartridge accommodating a filtration material separable into a plurality of portions, and a filter chamber connected to the mask body and configured to receive one portion of the filtration material. To change the filtration material, a user removes a first portion of the filtration material from the filter chamber, and positions a second portion of the filtration material contained inside the filter cartridge.

Abstract: A respiratory testing system comprises a fluid chamber enclosing a fluid medium and having a flexible membrane deflectable by the application of a respiratory gas flow, a pressure sensor configured to sense a pressure variation of the fluid medium in response to a deflection of the flexible membrane, and a processing circuit configured to compute a respiratory flow data from a pressure variation of the fluid medium. The respiratory testing system may additionally include a breathing exercise unit configurable to execute a software program responsive to an input of the respiratory flow data.