A burn victim with flame burns of the IIIA-B and IV degrees on his face, neck, and anterior surface of the thorax was brought into the admission room. The hairs in his nostrils are burnt, his labial and glossal mucosa are gray-white. The voice is hoarse; respirations are frequent and shallow; the patient has trumpet-like cough that produces soot-streaked sputum. The signs of respiratory failure were progressing, while the patient was being transported into the intensive care unit. What emergency care must be provided to this patient?