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A partial rebreather mask typically delivers an inspired oxygen concentration of approximately 35-60%. This type of mask is designed to allow some of the exhaled air, which contains carbon dioxide, to be re-inhaled while also providing supplemental oxygen from the reservoir bag.

The presence of the reservoir bag allows the patient to receive a higher concentration of oxygen, as the bag stores a supply of oxygen that can be expelled into the mask during inhalation. The exact percentage of oxygen delivered can vary depending on the patient's breathing pattern and the flow rate of oxygen, but the range of 35-60% is widely accepted in clinical practice.