From inside (document excerpt):
Product Data 58PAV Energy-Efficient Induced-Combustion Upflow Furnace Input Capacities: 45,000 thru 155,000 Btuh 80% AFUE At Budget Price Carrier provides an 80 percent Annual Fuel Utilization Efficiency (AFUE) gas furnace for the budget conscious consumer and builder. The 58PAV offers the same high quality you demand and receive from Carrier. All models are GAMA efficiency rating certified and certified for use in California Air Quality Management Districts.
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The cabinet is constructed from a specially selected galvanized steel. There is also double protection for the cabinet. First, a galvanized steel substrate provides resistance to rusting. Then the cabinet is constructed of prepainted steel — the same high-quality finish found on refrigerators and dishwashers. The 58PAV offers a hot surface ignition system which provides a superior and more reliable ignition system than older spark relight systems. The heat exchangers are constructed of aluminized steel and covered by a 20-year Limited Warranty. They are Carrier’s patented Super-S heat exchangers that improve heat transfer and enable downsizing of this furnace to only 40-in. tall. A patented draft safeguard will stop furnace operation if the vent system is not operating properly. To improve the sound level, we have incorporated a soft mount inducer assembly and a slow opening gas valve. The control board is the brain of this induced-combustion gas furnace. It offers a unique self-test feature that checks all the major functions of the furnace within 1 minute. The control board also features a 3-amp fuse that protects the transformer and control board. Another feature on the control board is an LED status indicator light to ensure top furnace performance. 1998 Carrier Corporation Form No. 58PAV-9PD HUM A89217 COM W Y R G 24V A95246 A92074 HEAT EXCHANGER CONTROL BOARD INDUCER BLOWER Model number nomenclature 58PAV 045 160 08 Nominal Cooling Size (Airflow) (400 CFM per 12,000 Btuh) 08 — 800 CFM 12 — 1200 CFM 14 — 1400 CFM 16 — 1600 CFM 20 — 2000 CFM Series Number Induced-Combustion Upflow Furnace Input Capacity.