Devices and methods for delivering air to a patient are provided. A device includes a first portion having a first airflow inlet and a first impeller configured to move in response to airflow from the first airflow inlet contacting the first impeller, the first portion defining a first airflow path a second portion having a second airflow inlet, a second impeller, and an outlet for communicating airflow to a patient, the second portion defining a second airflow path and means for coupling the first portion and the second portion, such that movement of the first impeller causes corresponding movement of the second impeller, wherein the second impeller is configured to impel air through the second airflow inlet and out of the outlet to the patient, upon movement of the second impeller and wherein the first and second airflow paths are not in fluid communication.
