From inside (document excerpt):
58MCB 4 WAY MULTIPOISE FIXED CAPACITY CONDENSING GAS FURNACE Input Rates: 40,000 thru 138,000 Btuh Product Data efficient ignition. The combustion inducer is unique in that efficient operation is achieved in any type of installation. Standard 2-in. (51 mm) PVC pipe connects the combustion-air and vent pipes to the furnace. The 58MCB is a standard part of a quality-built new home. This high efficiency furnace will provide years of quality service to home builders and home owners alike.
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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. 58MCB FEATURES / BENEFITS Serpentufft–Exclusive Serpentuff coating, a patented polypropylene laminate is used on the secondary heat exchanger. Power Heatt Igniter–The Carrier unique SiN igniter is not only physically robust but it is also electrically robust. It is capable of running at line voltage and does not require complex voltage regulators as do other brands. This unique feature further enhances the reliability of the 58MCB gas furnace and continues Carrier’s tradition of technology leadership and innovation in providing a reliable and durable product. Control Center–Controls sequencing and furnace operation. Equipped with a component test feature and status indicator light to assist in troubleshooting. Control times blower start after main burners ignite to eliminate cold air blowing into rooms. Direct or Non-direct Venting–The 58MCB can be installed as a 1 pipe-Non- Direct vent or 2 pipe/Direct vent furnace except the 140 size which can be installed as 2-pipe only. This provides added flexibility to meet diverse installation needs. Adjustable Blower Speed–For precise airflow selection of heating or cooling operation. Casing–One piece, seamless wraparound construction of prepainted galvanized steel resists corrosion. Combustion Products Venting–The combustion-air and vent pipes can terminate through a side wall or through the roof when used with a factory authorized vent termination kit. Insulation–Foil-faced insulation in heat exchanger section of the casing minimizes heat loss. Certifications–The 58MCB units are CSA (A.G.A. and C.G.A.) design certified for use with natural and propane gases. The furnace is factory-shipped for use with natural gas. A CSA (A.G.A./ C.G.A.) listed gas conversion kit is required to convert furnace for use with propane gas. The efficiency is GAMA efficiency rating certified. The 58MCB meets California Air Quality Management District emission requirements. Except for the 140 size unit, all sizes of the 58MCB can be installed in a manufactured (mobile) home when the optional kit is used. Refer to Vent Table for elevation limitations. Quality Registration–The 58MCB is engineered and manufactured under an ISO 9001 registered quality system.