Series DAFA Air Flow Indicator and Alarm

For Air Flow Monitoring in 3" and 4" pipes

The Series DAFA Air Flow Indicator and Alarm alerts users of low or no air flow conditions in pipes utilizing a thin, field trimmable vane to sense the air flow rate. An 85 dB audible buzzer alternates with a bright red LED to alert users when the air flow rate drops, indicating low or no flow in the pipe. The DAFA is battery powered to provide versatility for where it can be installed, and offers a yellow LED to indicate a low battery. This device is ideal for monitoring radon mitigation systems by detecting a loss of air flow in the pipe and providing a signal to homeowners if the fan has stopped operating.

Product Applications

  • Radon mitigation systems
  • Air flow monitoring in 3" and 4" pipes

Models & Ordering

Shipping Information

All shipping times are dependent on product availability at time of shipment.

Although we make every effort to ensure a continuous supply of our products, occasional circumstances may force us to temporarily run out of a product, or have shipping delays. Should this occur, customers will be notified soon after placement of any orders for such products and, if applicable, items will be put on backorder. For orders requiring expedited shipment, our customer service team can be contacted to confirm product availability

Model Description Usually Ships* Price Order
Ships: Next Day
Price: $55.00
Air flow indicator and alarm. Next Day* $55.00 Order


Clean air.
Actuation Point:
15 CFM (4" pipe); 10 CFM (3" pipe) on decrease in flow.
Audible Alarm:
At least 85 dB @ 1 foot distance.
Visual Alarm:
Red LED for no flow alarm; Yellow LED for low battery.
Wetted Materials:
ABS, polycarbonate, rare earth magnet.
Power Requirements:
3 V CR2450 lithium battery, included, user replaceable.
Battery Life:
5 years steady state; 48 hours during alarm state.
Temperature Limits:
32 to 122°F (0 to 50°C).
Mounting Orientation:
4 oz (113.4 g).
Agency Approvals:


  • Simple and quick installation
  • Field trimmable vane included to allow unit to be used in 3" and 4" pipes
  • Audible and visual alarms
  • Battery-operated with up to 5 year battery life and low battery warning


Product Literature


Catalog Pages

Product Data Sheet




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