// EMT Question · Airway, Respiration & Ventilation
Which oxygen delivery device provides the HIGHEST FiO2 for a spontaneously breathing adult?
A. Nasal cannula at 6 L/min
B. Simple face mask at 10 L/min
C. Non-rebreather mask at 15 L/minCorrect
D. Venturi mask at 40%
// Rationale
A properly fitting non-rebreather with reservoir delivers up to ~90% FiO2.