The NuTone FG7SD/M residential gas furnace is a single-stage, fixed-speed model. The 95 percent AFUE furnace is available in upflow/horizontal and downflow configurations. Units range in capacity from ...
A premium or high-end forced-air furnace is typically thought of as having an annual fuel utilization efficiency (AFUE) of 90% or above. These furnaces also usually come with other amenities, such as ...
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