The CMPEV is an upflow/horizontal left, two-stage, variable-speed condensing gas furnace. The company says the continuous fan mode works well with indoor air quality products, such as filters, because it operates at a slower speed, allowing them to capture more contaminants. This 92.1-percent AFUE furnace operates with a single-stage or two-stage thermostat and with or without a humidistat. The furnace has adjustable airflow to accommodate multiple duct static and airflow requirements, states the manufacturer. The furnace has a limited lifetime warranty on the heat exchanger and a five-year limited warranty on components.

Excel Comfort Systems Inc., 990 Main St., Blackville, SC 29817; 803-284-3322;

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