Which class of respirator offers the highest protection?

• A. Negative pressure respirator
• B. Positive pressure respirator
• C. Powered air-purifying respirator
• D. Supplied-air respirator

Answer: (B)

Positive pressure respirators push air outwards, keeping the inside of the facepiece at a higher pressure than the surrounding air. That outward push means any small gaps between the facepiece and your face tend to leak air outward rather than letting contaminated air seep in, so you have less exposure even if the fit isn’t perfect. This makes them more protective than negative pressure models, which can draw in contaminated air through leaks when you inhale. While other types (like powered air-purifying or supplied-air systems) have their own benefits, the inherent outward pressure provides the strongest protection in the given options. Of course, proper fit, maintenance, and correct usage are essential to maximize protection.