The Humid-Vent® combined filter/HME product line offers solutions to meet the needs of both anesthesia and intensive care. Bidirectional filtration offers both patient and equipment protection from airborne pathogens. Available in a variety of sizes to meet all clinical situations. All units feature outstanding moisture output, low resistance to flow and minimal deadspace. Individually packaged. Humid-Vent® Filter Small - Extremely small combined filter/HME for tidal volumes of 150-1000 mL. Only 27 mL of dead space with 30 mg/L moisture output at 500-mL tidal volume. Bacterial efficiency 99.9999%; viral efficiency 99.99+%