this invention is a device for inspiration of a mist from a nebulizer , the device comprising an inlet connector adapted to engage an outlet port of a nebulizer ; a hollow mouthpiece element for insertion into a patient &# 39 ; s mouth ; a conduit forming a fluid connection between the inlet connector , and the hollow mouthpiece element ; an exhaust valve for removing expiratory gases which are exhaled into the mouthpiece element to the ambient atmosphere via the exhaust / positive expiratory pressure valve positioned on the conduit between the inlet connector , and the mouthpiece element ; and a filter housing containing a filter for filtering the exhaled gases passing from the exhaust / pep valve .