The C-90B electronic air cleaner is replacing the C-90A. The C-90B is AHAM certified for up to 506 square feet. It offers delivery rates that are up to 18 percent higher than its predecessor. The C-90B provides a pollen Clean Air Delivery Rate (CADR) of 421 and, according to the manufacturer, has an exceptionally high CADR for dust and tobacco, too. It uses three-stage cleaning. Both the prefilter and the electronic cell are washable, while the carbon filter must be replaced periodically.

Friedrich Air Conditioning Co., P. O. Box 1540, 4200 N. Pan Am Expressway, San Antonio, TX 78295; 800-541-6645 or 210-357-4400;

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