From inside (document excerpt):
58PHA/PHX PERFORMANCE BOOST 80 4 WAY MULTIPOISE INDUCED COMBUSTION GAS FURNACE Input Capacities: 45,000 thru 135,000 Btuh Product Data outages. Applications are easy with 4-way multipoise design, through-the-furnace downflow venting, 13 different venting options, and a door designed for easy service access. An inner blower door is provided for tighter sealing in sensitive applications. The 58PHA/PHX furnaces are approved for use with natural or propane gas, and the 58PHX is approved for use in Low NOx Air Quality Management Districts.
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STANDARD FEATURES S ECM Blower Motor included S QuieTecht noise reduction system S SmartEvapt–Humidity control when using a Thermidistatt Control S ComfortFant–adjustable constant fan speed from the thermostat S High-Efficiency Media Filtration Cabinet included S Microprocessor based control center S LED diagnostics and self test feature S Stores fault codes during power outages S Adjustable heating air temperature rise S Adjustable cooling airflow S Dehumidification selection for summer-time cooling S 4-way Multipoise furnace, 13 vent applications S Compact design – only 33-1/3 in. (847 mm) tall S Power Heat SiNt Igniter S Draft safeguard switch to ensure proper furnace venting S Insulated blower compartment S Inner door for tighter sealing S HYBRID HEAT® Dual Fuel System compatible S All models are chimney friendly when used with accessory vent kit S Residential installations eligible for consumer financing through the Retail Credit Program Comfort A04040 THE CARRIER Comfortt 80 GAS FURNACE The 58PHA/PHX 4-way Multipoise Gas Furnaces offer deluxe features not found in other single-stage 80% gas furnaces. The ECM motor and Carrier’s control logic combine to provide a SEER BOOST to your condensing unit of up to 1.5 points as compared to coil only ratings. Carrier’s QuieTecht noise reduction system makes the Comfortt 80 an incredibly quiet induced-draft gas furnace. The exclusive Carrier Media Cabinet provides an economic way to add high performance air filtration to homes. The gas furnace control system provides a dehumidification mode, a motor speed selection for continuous fan operation selectable at the thermostat, and fault code storage in the event of power LIMITED WARRANTY S 20-year warranty on Super St heat exchanger S 5-year parts warranty on all other components 1 FURNACE COMPONENTS INDUCER MOTOR ASSEMBLY VENT ELBOW MAIN LIMIT SWITCH (BEHIND GAS VALVE) PRESSURE SWITCH FLUE COLLECTOR BOX GAS VALVE MANUAL RESET LIMIT SWITCHES DRAFT SAFEGUARD SWITCH FLAME SENSOR GAS MANIFOLD GAS BURNER HOT SURFACE IGNITER BLOWER DOOR SAFETY.