The Bryant 987M Evolution is a two-stage, variable-speed gas furnace. The 987M meets the Energy Star Most Efficient 2014 guidelines in all sizes, with an efficiency of up to 98.3% AFUE. The variable-speed motor operates on low speed the majority of the time, providing increased efficiency and quiet operation. The primary heat exchanger is made of corrosion-resistant aluminized steel, with a fin-and-tube stainless steel secondary heat exchanger. The 987M features a modulating gas valve and a PerfectLight hot surface ignitor. The cabinet is insulated for quiet operation, and an external filter cabinet provides easy access for filter changes. The 987M is designed for upflow, downflow or horizontal installation.
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