From inside (document excerpt):
COMFORTTM 92 MODEL 58MXB HIGHLY-EFFICIENT 4-WAY MULTIPOISE FIXED-CAPACITY DELUXE CONDENSING GAS FURNACE Input Rates: 40,000 thru 138,000 Btuh Product Data 4-Way Multipoise Design Allows More Applications. The ComfortTM 92 is a must for your product line. This high-efficiency furnace allows more applications with its reliable 4-way multipoise design. The ComfortTM 92 is available in 12 heat/airflow combinations and with the 4-way multipoise design can be installed in upflow, downflow, or horizontal positions covering up to 48 different applications.
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With the exception of the 140 size unit, all ComfortTM 92 models can be installed in a manufactured (mobile) home when the optional kit is used, and in installations with elevations up to 10,000 ft (140 size unit limitation 7,000 ft). The furnace is factory configured for upflow application. With the exception of the 140 size, all sizes can be installed with 2pipe or 1-pipe venting. The 140 size can be installed only as a 2-pipe system. This versatile unit utilizes Power HeatTM hot surface ignition (HSI) which ignites the burners directly. HSI eliminates gas waste that typical continuous-pilot designs can bring. Hot surface ignition provides reliable startup and operation. Take a look at the control center on the ComfortTM 92. Control of ignition, inducer, and blower operation is all handled in 1 central printed circuit board. The status indicator on the control signals when a fault has occurred and identifies where the problem is. This, along with the component test feature, makes the ComfortTM 92 one of the easiest gas furnaces to troubleshoot. High efficiency is achieved by maximizing heat transfer. The result is energy-saving efficiency, up to 95.5 percent Annual Fuel Utilization Efficiency (AFUE), and reduced operational noise. The ComfortTM 92 is one of the quietest furnaces in the industry. A unique feature of this unit is the patented polypropylene-laminated heat exchanger. This secondary heat exchanger ensures that all available heat is properly transferred to the airstream A05069 and throughout the home. Using the exclusive flow-through design, the secondary heat exchanger reduces the pressure drop in the furnace which leads to lower electrical usage, an important part of this unit’s efficiency. Carrier heat exchangers are backed by a Limited Lifetime Warranty. (See Warranties section for details.) When we put it all together, the ComfortTM 92 combines quality and design to bring high efficiency and comfort. You will enjoy the versatility and ease of installation of this unit. The ComfortTM 92 is equipped for either leftor right-side connections. Blower speeds are easily adjustable with speed-taps conveniently located on the control center. A combustion inducer allows for more use of 2-in. vent and combustion-air piping, keeping installation costs low. As with other Carrier furnaces, this model is designed to work as a part of the total home comfort system which includes elements for cooling, air cleaning, humidification, ventilation, and zoning. less airflow. This is done right at the thermostat.