A Study to Assess Pulsed Inhaled Nitric Oxide in Subjects With Pulmonary Hypertension Associated With Pulmonary Fibrosis

Inclusion Criteria: Diagnosed with pulmonary fibrosis by high resolution CT scan performed in the 6 months prior to screening associated with one of the following conditions and confirmed using one of the following guidelines, as per American Thoracic Society (AGS) / European Respiratory Society (ERS) / Japanese Respiratory Society (JRS) / Latin American Thoracic Association (ALAT): Major idiopathic interstitial pneumonias (IIPs) diagnosis or suspected as one of the following: Idiopathic pulmonary fibrosis Idiopathic nonspecific interstitial pneumonia Respiratory bronchiolitis-interstitial lung disease Desquamative interstitial pneumonia Cryptogenic organizing pneumonia Acute interstitial pneumonia Rare IIPs diagnosis by one of the following: Idiopathic lymphoid interstitial pneumonia Idiopathic pleuroparenchymal fibroelastosis Unclassifiable idiopathic interstitial pneumonias Chronic hypersensitivity pneumonitis Occupational lung disease Have been using oxygen therapy by nasal cannula for at least 4 weeks 6-Minute Walk Distance (6MWD) ≥ 100 meters and ≤ 450 meters at screening and Baseline/Randomization visits World Health Organization (WHO) Functional Class II-IV Forced Vital Capacity ≥ 40% predicated within the last 6 months prior to the screening run-in period Age between 18 and 85 years (inclusive) Exclusion Criteria: Pregnant or breastfeeding females at Screening In the last 6 months prior to screening, evidence of any connective tissue disease with FVC > 60% unless there is evidence of moderate to severe fibrosis on CT scan in the opinion of the local radiologist/Investigator