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Optimal protection for patients, staff and equipment Traps expectorated matter, bacteria and viruses. Validated cross-contamination efficiency 99.999 Percent.Proven efficiency at flow rates in excess of ERS high expiratory flow recommendations 80% reduction in energy expended during manufacturing, 54% reduction in filter waste volume Extended ergonomic oval mouthpiece with bite lip for improved patient comfort Suitable for inspiratory and expiratory spirometry testing with most Medisoft PFT and office spirometers including, Vitalograph, MIR, Micro Medical and COSMED devices