Compute-A-Fan for Windows 

Compute-A-Fan is a fast, accurate and easy-to-use fan-selection program. This tool gives point-and-click access to Cook's entire line of fans, blowers, gravity ventilators, energy recovery ventilators and laboratory exhaust systems. A comprehensive, cross-reference interface allows the user to select fans based upon the product specifications of any major manufacturer. The tools menu includes these proven timesavers: Fan Law Calculator, Duct Designer, Psychrometric Calculator, English-Metric Converter, Sound Converter, and Annual Energy Cost Estimator.