Which device delivers 24-40% FiO2 at a flow rate of 1-6 L/min?

A nasal cannula is the device that delivers an oxygen concentration (FiO2) of 24-40% when used at flow rates of 1-6 liters per minute. This device consists of two small prongs that are inserted into a patient's nostrils, allowing the delivery of supplemental oxygen directly to the nasal passages. The flow of oxygen through the cannula mixes with the ambient air, resulting in varying FiO2 depending on the flow rate; at 1-6 L/min, it effectively achieves the specified FiO2 range.

The simple mask, while it can provide supplementary oxygen, typically delivers a higher concentration of FiO2, often around 40-60%, and is used at flow rates of about 5-10 L/min to ensure proper function and prevent rebreathing of exhaled carbon dioxide. A Venturi mask is designed to provide a specific, precise FiO2, usually from 24-50%, based on the color-coded jets used with it at higher flow rates, and is better suited for patients who require controlled oxygen therapy. A bubble humidifier is not an oxygen delivery device but rather a component that adds moisture to the oxygen supplied, primarily used with devices like nasal cannulas, but