1 Acute exacerbation of COPD2 Cardiogenic pulmonary oedema3 Obesity and obesity hypoventilation syndrome4 Weaning from invasive mechanical ventilation5 Prevention of post‐extubation failure in those patients previously intubated6 Chest wall diseases and neuromuscular diseases7 Palliative care and do‐not‐intubate patients8 Miscellaneous (very old patients, community‐acquired pneumonia and bridge to transplantation)