when its more that 24%

36

Why would you need to do that anyway? If you need the concentrated O2 that a mask provides, then a nasal cannula is not affective.

Wear a cannula so that it causes a minimum of discomfort. The nasal cannula is a small piece of plastic tubing that is attached to a larger tube which, in turn, connects to the oxygen container. The cannula has two small prongs that are inserted into the nostrils. If the prongs are curved, they should point downward inside the nostrils.

Nasal Cannula