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2. Powered air-purifying respirator - Wikipedia

   en.wikipedia.org/wiki/Powered_air-purifying...

   A PAPR, gown, and biosafety cabinet in use in a BSL-3 laboratory. All parts of the PAPR are visible: the waist unit holding the fan, filter, and battery; the hose; and the mask, in this case a flexible, loose-fitting one. A powered air-purifying respirator (PAPR) is a type of respirator used to safeguard workers against contaminated air.

3. Respirator - Wikipedia

   en.wikipedia.org/wiki/Respirator

   All respirators have some type of facepiece held to the wearer's head with straps, a cloth harness, or some other method. Facepieces come in many different styles and sizes to accommodate all types of face shapes. A full facepiece covers the mouth, nose and eyes and if sealed, is sealed round the perimeter of the face.

4. Respirator assigned protection factors - Wikipedia

   en.wikipedia.org/wiki/Respirator_Assigned...

   The respiratory protective devices (RPD) can protect workers only if their protective properties are adequate to the conditions in the workplace.Therefore, specialists have developed criteria for the selection of proper, adequate respirators, including the Assigned Protection Factors (APF) - the decrease of the concentration of harmful substances in the inhaled air, which (is expected) to be ...

5. Glossary of breathing apparatus terminology - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_breathing...

   A powered air-purifying respirator (PAPR) is a type of respirator that consists of a headgear-and-fan assembly that passes ambient air through purifying units that remove contaminants and deliver clean air to the inside of the headgear covering the user's face or mouth and nose. Also known as positive-pressure masks, blower units, or just blowers.

6. Elastomeric respirator - Wikipedia

   en.wikipedia.org/wiki/Elastomeric_respirator

   Full-face elastomeric respirators generally seal better. [2] For substances hazardous to the eyes, a respirator equipped with a full facepiece, helmet, or hood is recommended. [35] Eyeglasses can clash with elastomeric masks. Conventionally, full-face masks are modified, with prescription lenses inserted into the mask.

7. Supplied-air respirator - Wikipedia

   en.wikipedia.org/wiki/Supplied-air_respirator

   Air-purifying respirators have APFs in the range 5–50 while SARs are in the range 25–2000, and full-facepiece pressure-demand SARs with an auxiliary pressure-demand SCBA have an APF of 10,000. For substances hazardous to the eyes, a respirator equipped with a full facepiece, helmet, or hood is recommended.