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It may be difficult to see and understand from the picture to the left, but I will attempt to explain. The switch mechanism was to control the humidifer for my homes forced-air furnace/AC system. The issue was the humidier did not have a system to check if air was flowing before running water thorugh the humidifer filter. So the humidifier would be using water nearly 24 hours a day in the winter, a massive waste of water and filters (which degrade and can become moldy with too much water). I was not aware of a known solution but creating a solution myself was no issue (and probably cheaper). The mechanism used a standard momentary switch and a large paddle to use air flow to trigger the switch. I mounted the mechanism inside the return-air duct which causes the paddle to be pushed downward while the blower motor of the furnace runs. The humidifier power circuit is connected throught the momentary switch, allowing the humidifer to run only while air is moving.
