Abstract
Noise-attenuating gas flow path for a compressor contained in a portable ventilator housing, the gas flow path comprising a plurality of chambers (202,210,224,232,240) interconnected by one or more flow tubes (212,228) and configured so that an impedance mismatch is created between the chambers and the flow tubes. The flow path may comprise one or more perforated tubes (234,242) located in one or more of the chambers. The compressor may be installed on a noise attenuating mounting system comprising resilient mounts (100) that cooperate to dampen vibrations generated by the compressor.