These commercial- and industrial-duty centrifugal fans handle air volumes from 50 to more than 300,000 cfm, in applications from filtering supply air for cleanrooms to exhausting fumes and combustion air from factories. The fans are offered in packages to save installation time, with custom-built isolation bases, motors, drives, and dampers. Most models are licensed to carry AMCA sound and air performance ratings. Electrostatic powder paint prevents corrosion and extends fan life, the manufacturer says.

Greenheck, P.O. Box 410, Schofield, WI 54476-0410; 715-359-6171; 715-355-2399 (fax); www.greenheck.com (Web site).

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• Greenheck