Flow switch.
Air Flow Switch for DC/ AC Voltage Supplies (Type 3201.-/3204.-)
These are factory set to 3m/s or about 10 feet per second. You will need to duct some air or place it in an area sure to sense flow.
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James
The pessimist complains about the wind; the optimist expects it to change; the engineer adjusts the sails.- William Arthur Ward (1921-1994)
Red-beard for President, 2020
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