A Study to Find an Efficacious and Safe Dose of CHF10067 (Zampilimab) in Participants With Idiopathic Pulmonary Fibrosis

Inclusion Criteria: * Informed consent: Participant's written informed consent obtained prior to any study-related procedure. * Sex and age: Male or female, of any race and ethnicity, aged ≥40 years with a life expectancy of at least 1 year at screening in the opinion of the Investigator. * Body weight ≥45 kg. * Diagnosis of IPF: Diagnosis as defined by the 2018 and 2022 American Thoracic Society/European Respiratory Society/Japanese Respiratory Society/Latin American Thoracic Society Guidelines for a maximum 8 years before screening. The most recent HRCT(High-resolution computed tomography) ≤6 months prior to screening, reviewed by central reading, should be used to confirm the diagnosis. * Lung function: Forced vital capacity (FVC) ≥45% of predicted normal value and a ratio of forced expiratory volume in the first second/FVC ≥0.7 at screening. * Diffusing capacity of the lung for carbon monoxide (DLCO) corrected for haemoglobin ≥25% of predicted normal at screening. * Oxygen saturation measured by pulse oximetry (peripheral capillary oxygen saturation \[SpO2\]) \>90% at rest when the maximum oxygen flow is 4 L/min by standard nasal cannula or the equivalent oxygen delivery via reservoir nasal cannula (≤2 L/min). Exclusion Criteria: * Participant with a documented diagnosis of coeliac disease. * Low respiratory tract infection: Documented low respiratory tract infection in the last 4 weeks prior to screening or documented acute exacerbation of IPF (defined as acute worsen…