The Air-Conditioning, Heating, and Refrigeration Institute has introduced two new certification programs for variable frequency drives (VFDs) and datacom cooling (DCOM) equipment. “AHRI manages 40 ...

[Mostafa] was a bit bored and had a broken DVD player sitting around, so he decided to take it apart to see what made the machine’s LCD panel tick. Once he popped it open, he discovered it wasn’t an ...