The Vitalograph Eco BVF (Bacterial Viral Filter) filters combine independently validated 99.999% bacterial and viral cross-contamination efficiency for healthcare professionals, patients, and equipment, with a reduced environmental impact due to less plastic used in production. The electrostatically charged barrier filters droplets, aerosols, bacteria, and viruses from the airflow. When a new BVF is used for each patient, the interior of the device is protected, so only the exterior needs to be cleaned. The Vitalograph Eco BVF series protects patients, healthcare professionals, and equipment from cross-contamination and contamination during pulmonary function testing. The 28554 fits Vitalograph, MIR, Micro Medical, and Cosmed equipment. (Model 2820)