A spirometer turbine assembly is described, having a housing with a proximal end opening, a distal end opening and an airflow channel therebetween. A first flow director has a first plurality of flow director blades with distal edges that curve in a plane perpendicular to a longitudinal axis of the airflow channel, and a vane is connected to an axel positioned distal to the first flow director. A spirometer turbine assembly having an anti-static material is also described.
