The Model 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. To place an order or learn more, please visit the Dwyer website at https://dwyer-inst.com/modeldafa.html

1. Model DAFA
Air Flow Indicator & Alarm
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2. DAFA Air Flow Indicator & Alarm
General Information
● What is it?
○ The Model DAFA is an air flow indicator and alarm that can be used to alert users of low or no air flow
conditions in 3 to 4 inch pipes

3. DAFA Air Flow Indicator & Alarm
Applications
◆ Radon mitigation systems
◆ Air flow monitoring in 3″ and 4″ pipes

4. DAFA Air Flow Indicator & Alarm
Features/ Benefits
● Field trimmable vane included
○ Allows the unit to be used in 3″ or 4″ pipes
● Simple installation
○ Unit can be quickly put into use
● Audible and visual alarms
○ Ensures alarm will be noticed
● Up to 5 year battery life
○ Maintenance time is reduced

5. DAFA Air Flow Indicator & Alarm
Key Specifications
● Service: 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: Vertical
● Weight: 4 oz (113.4 g)
● Agency Approvals: CE

6. DAFA Air Flow Indicator & Alarm
Accessories
A-DAFA-VANE
Replacement trimmable vane

7. DAFA Air Flow Indicator & Alarm
Operation
Normal Air Flow Low/No Flow
Alarm OFF Alarm ON

8. The DAFA features a trimmable vane to fit in 3″ and 4″ pipes.
DAFA Air Flow Indicator & Alarm
Operation – Trimmable Vane
4″ Pipe Installation
Factory Vane
3″ Pipe Installation
Trim along indentations in vane

9. DAFA Air Flow Indicator & Alarm
Dimensions

10. DAFA Air Flow Indicator & Alarm
Additional Information
● You can find more information on this product by visiting our website https://dwyer-inst.com/
● For any technical questions you may have, we have several Applications Engineers available by
phone or email at:
○ (219) 879-8000 x6402
○ tech@dwyermail.com
● To request a quote or place an order, contact one of our Customer Service Representatives at:
○ (219) 879-8000 x6656
○ quotes@dwyermail.com
○ orders@dwyermail.com

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