McDonnell & Miller Series AF1, AF2, AF3 Air Flow Switches

The McDonnel & Miller Series 1575 provides continuous protection against a low water condition. Furthermore it satisfies pump control needs for commercial and industrial steam boilers.

If you need a different model other than those listed, please contact us at

SKU: e4848f09db06 Category: Tag:



McDonnell & Miller Series AF1, AF2, AF3 Air Flow Switches

For general purpose applications with medium and high velocity requirements
Paddle fits 8? (203mm) minimum duct size, or 6? (152mm) if trimmed
Brass, steel and aluminum construction
Single pole, double throw snap switch
Sensitivity adjusting screw makes flow adjustment easy
Two electrical knock-outs allow connection from either end can be equipped with a time delay relay
Optional features
– Stainless steel
– Anti-corrosion treatment
Minimum ambient temperature 32°F (0°C)
Maximum duct temperature 300°F (149°C)


    • Over 50 years of industry knowledge
    • Fast customer service; response within 15 minutes
    • Best price quality ratio
    • We facilitate the total procurement, purchase and engineering process of our customers