Comparison of Two Continuous Positive Airway Pressure Systems

Inclusion Criteria * Participant is willing to provide written informed consent * Participant is able to read and comprehend written and spoken English * Participant is ≥ 18 years of age * Participant has been diagnosed with Obstructive Sleep Apnoea (OSA) * Participants has been established on Continuous Positive Airway Pressure (CPAP) for ≥ 6 months * Participants is currently using the same mask type/variant as the interventional mask system to be evaluated * Participants is able to participate for the duration of the study Exclusion Criteria * Participant is not willing to provide written informed consent * Participant is unable to read and comprehend written and spoken English * Participant is \< 18 years of age * Participant has not been diagnosed with Obstructive Sleep Apnoea (OSA) * Participant has not been established on Continuous Positive Airway Pressure (CPAP) for ≥ 6 months * Participant is not currently using the same mask type/variant as the interventional mask system to be evaluated * Participant is unable to participate for the duration of the study * Participant is pregnant * Participant is established on bi-level support therapy * Participant, or participants bed partner, has metallic implants in head neck or chest * Participant has a with a pre-existing lung disease or a condition that would predispose them to pneumothorax (e.g. Chronic Obstructive Pulmonary Disease (COPD), lung cancer; fibrosis of the lungs; recent (\< 2years) case of pneumonia or lung infection, lung injury) * Participant is unsuitable to participate in the study in the opinion of the researcher