Fitting the Cannula to Your Size

The shorter prongs of the nasal cannula should rest gently at the opening of your nostrils to measure airflow from your nose. The longer prong(s) of the nasal cannula should rest just in front of your upper lip to measure airflow from your mouth.

If the prongs are too long and extend too far up your nose or past your lower lip, you may trim the ends with scissors as shown.

Cannula Placement

Three-Prong Cannula: This cannula uses its own tubing to secure the prongs in place under your nose.

Place the cannula under your nose, inserting the shorter pair of prongs gently into your nostrils and the longer prong pointing down towards your mouth. Route the tubing up and over the tops of your ears, just like you would wear eyeglasses. Guide the tube ends down to meet under your chin and adjust the slider/clip to tighten or loosen the tubing until the cannula feels snug and comfortable.

Four-Prong Cannula: This cannula features an elastic headband to secure it in place.

Place the cannula under your nose with the shorter pair of prongs resting under your nostrils and the longer pair of prongs pointing down towards your mouth. The elastic headband fits around your head and over the ears. You can pull on the ends of the band to adjust the cannula for a comfortable fit.