From inside (document excerpt):
58CVA/58CVX Variable-Speed, 4-Way Multipoise Gas Furnace Installation, Start-up, Operating, and Service and Maintenance Instructions -Series 120 THE INFINITY 80 GAS FURNACE The 58CVA/CVX Variable-Speed, 4-way Multipoise Gas Furnaces offer unmatched comfort with ComfortHeatTM Technology and IdealHumidityTM in an 80% AFUE gas furnace. You get all the benefits of a ComfortHeat Technology furnace: reduced drafts, reduced sound levels, longer, more gentle cycles, less temperature swings between cycles, and less temperature differences between rooms.
With the variable speed blower motor, homeowners can now economically run constant fan to help eliminate temperature differences throughout the house and to get better indoor air quality. This IdealHumidity furnace also increases comfort in the summer by wringing out extra humidity when needed. The 58CVA furnaces are approved for use with natural or propane gas, and the 58CVX is approved for use in low Nox Air Quality Management Districts. STANDARD FEATURES · ComfortHeatTM Technology Intelligent microprocessor control Two-stage heating with single-stage thermostat Very low operating sound through low-stage operation and QuieTechTM noise reduction system Integral part of the IdealHumidityTM System Maximum dehumidification selection for summer time cooling Full IdealHumidity benefits including “Super Dehumidify ” Variable-speed blower motor Super-low electrical use, up to 80 percent less than standard models Increased SEER ratings for AC and HP systems Perfectly matches CFM to cooling system at all static points Media Filter Cabinet Included Microprocessor based “smart ” control center Automatically adjusts heating stage times to meet demand Adjustable heating air temperature rise ComfortFanTM – Constant fan speed selectable from thermostat Up to 12 cooling airflow selections with a wide range of capability LED diagnostics and self test feature Stores fault codes during power outages Optional laptop and handheld PDA diagnostic software 4-way Multipoise furnace, 13 vent applications Shorter in height only 33 ” tall Power HeatTM Igniter Draft safeguard switch to ensure proper furnace venting Insulated blower compartment Heat pump compatible All models are Chimney Friendly when used with accessory vent kit Residential installations eligible for consumer financing through the Retail Credit Program LIMITED WARRANTY 20-year warranty on “Super STM ” heat exchanger 5-year parts warranty on all other components 11-05 Form No./Catalog No. 58CV-5SI Variable Speed Induced-Combustion Deluxe 4-Way Multipoise Furnace Cancels: 58CV-4SI/II315A-70-3 58CV-5SI/II315A-70-4 10-05 Installation, Start-up, Operating, and Service and Maintenance Instructions Series 120/C NOTE: Read the entire instruction manual before starting the installation. This symbol indicates a change since the last issue. Portions of the text and tables are reprinted from NFPA 54/ANSI Z223.1-2006, with permission of National Fire Protection Association, Quincy, MA 02269 and American Gas Association, Washington DC 20001.