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From inside (document excerpt):
Product Data HEATING & COOLING 58GFA High-Efficiency Induced-Combustion Upflow Furnace Heating Inputs: 65,000 — 150,000 Btuh 78% AFUE With ContinuousPilot Ignition Carrier is the first manufacturer to provide a 78% Annual Fuel Utilization Efficiency (AFUE) gas furnace for the budget conscious consumer and builder. The 58GFA offers the same high quality you demand from Carrier. The superior attention to cabinet detail is obvious.
The Carrier 58GFA features 1-piece, seamless, wraparound construction. There are no spot welds on the exterior surfaces of the furnace. 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 58GFA offers a proven continuous-pilot ignition system which provides superior reliability. Carrier’s patented Super-S heat exchanger improves heat transfer and enables downsizing of this furnace to only 40 in. tall. It is covered by a 10-year heat exchanger Limited Warranty. The solid-state control board is the brain of this induced-combustion gas furnace. The control board features a 3-amp fuse which protects the 24-v control transformer. 1993 Carrier Corporation Form 58GFA-2PD This document was created with FrameMaker 4.0.4 1 COM PR-2 CFR LO HI L2 HFR L1