Thermovent 600 Heat and Moisture Exchangers, Box of 50 (100/580/015)The Thermovent 600 is sterile, single use, heat and moisture exchangers for use with intubated patients using a ventilator or other positive pressure breathing system. These devices are used to: Preserve humidity and minimize damage to tracheal epithelial cells Reduce heat loss through the bronchopulmonary tree Help prevent thickened secretions and changes in lung function during long term anesthesia or ventilatory support