“…Although pulmonary alveolar proteinosis is mainly idiopathic, patients with secondary PAP have also been identified. Secondary PAP factors include insecticides, inorganic dusts such as silica, hematological malignancies, HIV infection, leflunomide, toxic gas inhalation, exposure to silica, various industrial exposures to aluminum-and metal oxide-containing dusts and clinical conditions (6,7). Known as FM 200 or HFC-227 1,1,1,2,3,3,3-hepatofluoropropane is a hydrofluorocarbon used in the automatic fire extinguishing systems, and it is, in general, non-toxic under normal conditions (8).…”