[Nubmian] set the transducers up in a PVC pipe and blew air into it with a fan ... the ground did the trick. For more HVAC projects check out this pinwheel flow meter and [Adam]’s piece on ...

An HVAC pressure sensor plays a crucial role in measuring and monitoring the pressure within heating, ventilation, and air conditioning ... regulate refrigerant flow. Proper airflow flow is ...

Pinwheels are pretty optimized from a design standpoint, and are so cheap and easy to build that putting a pinwheel to work as an HVAC duct ... His experiments in air duct flow measurements ...