The Rheem Classic Series® RGRL Model 90 percent gas furnace offers two-stage operation. An integrated control board manages all operational functions and provides hookups for a wide variety of IAQ products, such as energy and heat recovery ventilators, ultraviolet filters, and most single- and two-stage programmable thermostats. The unit has a 34-inch cabinet and fits into small vertical spaces. This furnace, with three efficiencies available ranging from 45,000 to 90,000 Btuh, qualifies for U.S. federal tax credits.

Rheem Air Conditioning Div., P.O. Box 17010, Fort Smith, AR 72917-7010; 479-646-4311;

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