and are so cheap and easy to build that putting a pinwheel to work as an HVAC duct flow meter seems like a great idea. Great in theory, perhaps, but as [ItMightBeWorse] found out, a homemade ...
Aluminum foil connected to the ground did the trick. For more HVAC projects check out this pinwheel flow meter and [Adam]’s piece on HVAC techs, hackers who make house calls.
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