This study will evaluate patient comfort and oxygen delivery efficiency when providing
supplemental oxygen through a nasal cannula to volunteers using an instrumented oxygen
delivery system. The goals of the study are to evaluate different oxygen flow rates and
oxygen delivery modes. In addition, the investigators will investigate if the system can
detect apnea (cessation of breathing) and removal of the nasal cannula. The investigators
will also investigate how well high flow oxygen delivered only during inspiration is
tolerated and how much the end-tidal oxygen increases after two minutes of high oxygen flow
delivered only during the inhalation phase of the breath.