Greenheck’s new Model APD plenum fan features a direct drive fan with the wheel connected to the motor shaft. With no fan shaft bearings or belts to maintain, the company says its Model APD eliminates the cost and maintenance associated with traditional belt drive plenum fans.
Rosenberg introduced its new electronically commutated Unobox fans for data center cooling retrofits. The company has now expanded the Unobox line to include standard AC models for use in harsh environments or where variable frequency drives are already employed.
Why was one floor’s laboratory ventilation failing to keep up, when it was even the closest floor to the rooftop fans? Some system sleuthing led two engineers to a fitting conclusion. Read more stories in May Issue 2017.