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Allegro 9850 A-4000AD Breathing Air Pump

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Allegro A-4000AD Air Driven Breathing Pump. Ambient Air Pump that is air driven making it perfect for use when electric power is unavailable or undesirable. Most effective in work areas where large amounts of compressed air are available, such as sandblasting. Can handle up to four full or half mask users  or three hood users. Air driven motor is protected and lubricated by a high capacity filter/ regulator/lubricator assembly. Requires 75 CFM at 80 psig. Solid performance in multi worker applications, abrasive blasting, cleaning, sanding or chemical handling operations.


  • Rigid metal base and housing with four rubber feet
  • Galvanized steel plumbing
  • Quick-connect Rectus (OBAC) air fittings (other fittings available on request)
  • Adjustable brass pressure relief valve
  • Pressure gauge 0-15 psi
  • Fan guard
  • Powder coated gray


  • Type: Oil-less, rotary vane, direct driven Vanes: Carbon construction (4 ea/ replaceable) (3.500” X 1.344” X 0.188”)
  • Inlet Filter: 50 micron felt material
  • Exhaust Filter: 0.3 Micron HEPA
  • Working Pressure: 2-12 psi (15 psi max)
  • Performance: 0-20 CFM (adjusted via pressure relief valve)
  • Airline length: 100 Feet maximum, from pump to respirator. (sold separately)
  • Noise level: At Pump: 95 dB
  • At 6 feet: 85 dB
  • At 10 feet: 78 dB


  • Plumbing: Galvanized with brass ball valve
  • Design: Four carbon vane design for precise control and for stalled start-up operation
  • Muffler: PVC extension to prevent freezing or icing
  • Filtration: Zinc manifold, ABC cover, nylon guard, poly carbonate bowl with a 40 micron sintered polyethylene coalescing filter element and 0-160 psi pressure gauge
  • Lubricator: Zinc manifold, ABS cover, poly carbonate bowl with fill port for easy servicing

*Warning: Ambient Air Pumps are not to be used with generators
**Warning: Air inlet to the pump must be located where breathable air can be assured at all times

Dimensions: 23.5" L x 9.5" w x 15.5" H
Weight: 83 pounds

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