His experiments in air duct flow measurements, ... 12 thoughts on “ Custom Cut Pinwheel Makes A Useful HVAC Duct Flow Meter ” Ren says: August 25, 2017 at 1:11 pm ...

Measuring air flow in an HVAC duct can be a tricky business. Paddle wheel and turbine flow meters introduce not only resistance but maintenance issue due to accumulated dust and debris. Being able … ...