Heated Humidifier -- Heat and Moisture Exchangers (HME) -- Main techniques for evaluating the performances of humidification devices used for mechanical ventilation -- Humidification during conventional oxygen therapy. Physiology -- Humidification- High-Flow Oxygen Therapy in Critically Ill Patients. Devices and humidification technology. Clinical implications -- Humidification and Noninvasive Ventilation -- Humidification in mechanical ventilated patients and selection of devices -- Impact of humidification strategy during lung (and heart) protective ventilation -- Effect of Airway Humidification Devices in lung mechanics (volume/airflow) -- Humidification during invasive mechanical ventilation -- Postoperative Mechanical Ventilation-Humidification -- Humidification in Laparoscopy -- Humidification and complications in invasive mechanical Ventilation -- Humidification in Post-Extubation Respiratory Failure -- Humidification tracheostomy: physiology and device -- Ineffective Complications in tracheostomized patients -- Humidification tracheostomized patients -- Humidification in Critically Ill Neonates -- Humidification during Non-invasive Respiratory Support of the Newborn -- Humidification in Neonatal-Pediatric Critical Care (Invasive Ventilation) -- Technology, Complications, and Prevention -- Airway clearance in chronic respiratory disorders: obstructive CF, COPD, Asthma -- Airway Clearance Neuromuscular Disorders (Chronic and Acute Conditions) -- Weaning from Mechanical Ventilation, Extubation and Airway Sections and Humidification Evaluation -- Airway clearance disorders hypoxemic (ARDS, pneumonia, cardiac pulmonary edema) -- Airway clearance in conditions of high-risk infections (COVID19 and other conditions) -- Airway clearance in Neonatology-Pediatric critical care -- Non Assisted airway clearance techniques -- Airway Clearance. Cough assisted devices -- High Frequency Chest Wall Oscillations And Compressions -- Humidification recommendations in High Frequency Percussive Ventilation -- Biphasic Cuirass Ventilation for Airway Secretions -- Aerosol therapy and humidification -- Airway clearance in critical ill patients -- Tracheostomized patients. Airway clearance in tracheostomized patients.