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Model AAFS | Adjustable Air Flow Paddle Switch has a stainless steel vane, galvanized steel base, and ABS enclosure. Applications include air flow proving in HVAC systems. | Dwyer Instruments
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SMC PFMB7201-02-F-R 2-color digital flow switch for air, DIGITAL FLOW SWITCH
Economical Air Flow Switch With High/Lo Alarms | Omega