NAL ER IPF Respiratory Function and Safety Study

Inclusion criteria: * Diagnosis of IPF as determined by a pulmonologist based on American Thoracic Society (ATS)/ European Respiratory Society (ERS) / Japanese Respiratory Society (JRS) / Asociación Latinoamericana de Tórax (ALAT) guidelines. * SpO2 ≥ 92%, taken after at least 5 minutes in a sitting position, undisturbed and non-stimulated - Saturation of Hemoglobin with Oxygen as measured by pulse oximetry. * FVC ≥ 40% of Global Lung Function Initiative (GLI) 2012 predicted values- Forced Vital Capacity, as determined by spirometry adhering to ATS/ERS guidelines. Exclusion criteria: * Exacerbation of IPF in the last 3 months. * Positive results for coronavirus infection (COVID-19) at Day -2, prior to Admission to the clinical research unit (CRU). * Diagnosis of Chronic Obstructive Pulmonary Disease (COPD), or an forced expiratory volume in 1 second (FEV1)/forced vital capacity (FVC) \<0.8. * Currently using any overnight oxygen therapy at any level or delivered by any modality. Intermittent daytime oxygen use of any duration is allowed. * Diagnosis of sleep disordered breathing (e.g., sleep apnea). * Upper or lower respiratory tract infection within the 8 weeks prior to admission to the CRU. * Clinical history of aspiration pneumonitis. Note: Other inclusion/exclusion criteria mentioned in the protocol may apply.