Final answer:
The Non-rebreather mask is the best O₂ mask for Mr. Flores, delivering close to 100% oxygen and preventing the dilution with room air.
Step-by-step explanation:
If Mr. Flores requires a non-rebreather, the best choice for an O₂ mask for him would be Option 4, the Non-rebreather mask.
A non-rebreather mask is a device used in medical emergencies that requires high-concentration oxygen therapy. The mask includes a reservoir bag that is connected to an oxygen supply, with a one-way valve between the bag and the mask preventing exhaled air from getting into the bag. This ensures the patient inhales almost 100% oxygen from the reservoir bag.
The mask also has flutter valves to prevent room air from entering, which could dilute the oxygen concentration. This type of mask delivers the highest concentration of oxygen compared to other devices like the nasal cannula, Venturi mask, or simple face mask, which are more suitable for patients who require lesser concentrations of oxygen or a controlled mix of oxygen and room air.