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  • Devices intended to be used as an interface between a noninvasive positive pressure ventilator and a patient, and designed to deliver pressurized air (with or without supplemental oxygen) to the patient\'s airway. These devices typically consist of a plastic and rubber apparatus designed to form a tight seal around the user\'s nose and/or mouth; the devices typically incorporate head straps to hold the mask in place and facilitate seal formation. Masks designed to work with non-invasive positive pressure ventilators are typically non-vented and rely on the exhalation valve of the ventilator to prevent carbon dioxide accumulation in the mask.
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