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Allegro 9901 Full Face Constant Flow Supplied Air Respirator, Low Pressure

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This Full Face Supplied Air Respirator Mask offers low pressure continuous flow protection with a unique over the shoulder hose design and an adjustable belt holds the hose out of the way. It’s durable and easy to use and clean.  It has a double sealing flange that will provide you with great face to mask seal. The polycarbonate lens is replaceable and has a distortion free viewing area with anti fog and anti scratch coating. Be sure to purchase peel off lens covers to extend the life of your full face supplied air respirator mask.


  • High impact polycarbonate (meets ANSI Z87.1)
  • Wide field of vision with replaceable lens
  • Distortion-free
  • Anti-fog and anti-scratch coatings
  • Available lens peel-offs (PN 9901-25)


  • Non-slip durable rubber five-point harness
  • Mesh hair net minimizes pulling of hair
  • Fits under hard hats
  • Unique adjustable buckle system to lock in place


  • Hypoallergenic and chemical/ozone resistant
  • Durable silicone rubber maintains shape while in storage
  • Comfortable even in extreme heat and cold environments
  • Double sealing flange and deep chin pocket for better face to mask seal


  • Large diameter contoured exhalation valve design, for minimal breathing resistance
  • Easily accessible for fast replacement and cleaning
  • Removable cover protects the exhalation valve form dirt, paint spray and from freezing


  • 90° elbow allows it to be directed over the shoulder and out of the way
  • Corrugated flexible and lightweight material for greater comfort and less fatigue
  • OBAC quick-connect plug with wide diameter and minimal air restriction
  • Low profile nylon adjustable waist belt
  • Plastic clip to restrain airline hose from pulling on the face piece NIOSH APPROVAL:
  • Approval No. TC-19C-353 (Use only with Allegro approved airline hose)

Allegro AS 9901-25 Lens Cover Peel Offs available for this Full Face Respirator Mask

Free Shipping on Orders of Allegro Equipment over $650!

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