From inside (document excerpt):
58PHA/PHX PERFORMANCEt BOOST 80 4 WAY MULTIPOISE INDUCED COMBUSTION GAS FURNACE Input Capacities: 45,000 thru 135,000 Btuh Product Data 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 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. 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 A08223 THE CARRIER PERFORMANCEt BOOST 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 of up to 1.5 points.* Carrier’s QuieTecht noise reduction system makes the Performancet Boost 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.