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Air Flow Alarm (28421) with Audible & Visual Alerts

Model #: 28421

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Air Flow Alarm (28421) with Audible & Visual Alerts
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Category Mitigation Parts

RadonAway Air Flow Alarm with Audible and Visual Alerts

The RadonAway battery powered air flow alarm monitors radon system operation. It mounts directly onto the system pipe to alert users of a low or no air flow condition. A thin, field trimmable vane installed within the pipe operates in air flow as low as 10 CFM in a 3” pipe and 15 CFM in a 4" pipe. An audible buzzer alternates with bright, flashing red LED light when there is no air flow in the pipe. This monitor does not measure radon levels.

  • Easy Installation (indoor use only)
  • For use on 3 or 4" pipe
  • Battery operated
  • Visual alarm (Red LED light)
  • Audible alarm
  • Low battery warning


  • Actuation point on decrease in flow:
    • 4" Pipe: 15 CFM
    • 3" Pipe: 10 CFM
  • Audible alarm: 85 dB at 1 foot distance
  • Visual alarms:
    • Red LED: no flow alarm
    • Yellow LED: low battery
  •  Materials with moisture contact are made of: ABS, Polycarbonate & Rare Earth Magnet
  • Power supply: (1) CR2450 Lithium battery (supplied)
  • Battery life (approximate):
    • 5 years steady state
    • 48 hours during alarm condition
  • Operating temperature: 32° F to 122° F
  • Operating humidity: 10 to 95% RH
  • Application limits: Corrosive environments
  • Dimensions: 3.5" x 2.1" x 1.5"
  • Weight: 4 ounces (113.4 grams)

Supplied with:

  • RadonAway air flow alarm
  • Battery
  • Trimmable vane
  • Installation instructions
  • Alarm information sticker
Search Category: Home & Garden
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Category Mitigation Parts
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