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From inside (document excerpt):
® Product Data 58EFA Horizontal Gas Furnace 50,000 — 125,000 Btuh Input GAS SUPPLY MANUAL SHUTOFF VALVE SEDIMENT TRAP UNION Carrier presents the 58EFA, a dedicated horizontal gas furnace that excels in the competitive market of mid-efficiency gas furnaces. The 58EFA furnace offers dependable and economical heating. The 58EFA utilizes an intermittent ignition system which ignites the pilot — eliminating a gas-wasting continuous pilot.
The 58EFA incorporates control of ignition, inducer, and blower operation into 2 printed-circuit boards, resulting in a reliable and uncomplicated system. Induced combustion contributes significantly to the heat transference efficiency of the 58EFA. A corrosion-resistant steel heat exchanger extracts heat in the 58EFA and conveys it to the airstream that warms the home. This heat exchanger is the clam-shell type utilized for years because of its reliability. All these features result in a furnace that will not only heat your home comfortably for many years to come, but do it with an Annual Fuel Utilization Efficiency (AFUE) of 80%. The 58EFA is easy to install, which means lower installation costs. At 50in. long, it can be conveniently employed in either new or replacement applications. The furnace can be field reversed for left or right gas, electrical, and vent pipe connections and is equipped with adjustable blower speeds to fit most applications. Carrier makes adjusting blower speeds easy with a speed-tap selector located on the blower motor. There is no need to remove the blower or perform other complex procedures. 1993 Carrier Corporation Form 58EFA-2PD This document was created with FrameMaker 4.0.4 With a Carrier gas furnace, your options are open when it comes to expanding your comfort system — air conditioners, humidifiers, and electronic air cleaners are among the offerings. A factory-installed 40-va transformer, air conditioner relay, and multispeed blower simplify the installation of add-on options. Carrier’s 58EFA Horizontal Gas Furnace heat exchangers are backed by a 10-year warranty. See your dealer for more details. 58EFA FEATURES/ BENEFITS Certifications — The 58EFA units are A.G.A. and C.G.A. design certified for use with natural and propane gases. The efficiency is GAMA efficiency rating certified. The 58EFA surpasses California minimum seasonal efficiency requirements, and meets the oxides of nitrogen (NOx) emission levels set by South Coast and Bay Area Air Quality Management Districts in California. Warranty — 10-year warranty on the heat exchangers, 1-year warranty on control boards. Your dealer has details.