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