Suitable for inspiratory and expiratory spirometry testing
Protects the subject against cross-infection
Protects the spirometer against cross-contamination
99.99% Cross-contamination efficiency
Very low expiratory flow impedance
Low effective dead space of 65 mL as required for lung volume and DLCO testing
Comfortable mouthpiece
Efficient at high flow rates
99.99% at 55 and 750 L/min Efficiency
0.7 to 1 µm Validation using Bacillus Subtilize var niger mean diameter
0.08 kPa/L/s (0.8 cmH2O) resistance to airflow at 750 L/min (BVF alone)
0.12 kPa/L/s (1.2 cmH2O) Resistance to airflow at 750 L/min (BVF + Fleisch)
