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PAPRs have low breathing resistance, unlike filtering facepiece respirators such as N95 masks. [3] A PAPR may have adjustable air flow rates for added comfort. [1] While they are often referred to as positive pressure masks, they are not true positive-pressure devices as overbreathing can overcome the pressure supplied by the fan. [4]
The company still produces its flagship product, the Scott Air-Pak SCBA. [11] [12] Scott Safety creates several kinds of compressor systems including the HushAir 7500 Connect which includes the HushAir Connect RevolveAir Connect for filling SCBA cylinders, and SmartTouch Controller, which integrates the breathing air compressor, storage bottles, and a charge station.
The respirator has three HEPA filters that are certified to remove 99.7% of particles of 0.03 to 3.0 microns in diameter. The filtered air is supplied at the rate of 170 L/min to the top of the hood under positive pressure for breathing and cooling. The air is forced out through an air exhaust valve at the base of the hood.
Elastomeric respirators are examples of air-filtering respirators, in contrast to air-supplying respirators. Air-supplying respirators are usually positive-pressure, so they leak outwards, and thus offer better protection. They are more complex and heavier, but less bulky about the head, and can be worn for longer. [1]
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