From inside (document excerpt):
58MEB Performancet Boost 90 4 Way Multipoise Condensing Gas Furnace Input Rates: 40,000 thru 120,000 Btuh Product Data 4-WAY MULTIPOISE DESIGN ALLOWS MORE APPLICATIONS design, the secondary heat exchanger reduces the pressure drop in the furnace resulting in lower electrical usage. The high efficiency achieved by superior heat transfer is made only better–by optimizing the efficient ECM motor speed tap locations.
Carrier heat exchangers are backed by a Limited Lifetime Warranty. (See Warranties section for details.) A standard media filter cabinet accessory is provided with the Performance Boost 90 in order to provide an opportunity to enhance indoor air quality. As with all 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. Boosting the unit’s efficiency with the ECM motor and Carrier’s deluxe features show the Performance Boost 90 has been designed with the homeowner in mind. PERFORMANCETM BOOST 90 FEATURES & BENEFITS SerpentuffTM — Exclusive Serpentuff coating, a patented polypropylene laminate is used on the secondary heat exchanger and greatly reduces maintenance. Power HeatTM Igniter — Carrier’s 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 Performance Boost 90 gas furnace and continues Carrier’s tradition of technology leadership and innovation in providing a reliable and durable product. ComfortFanTM — Improves comfort all year long by allowing the homeowner to select different fan speeds during continuous fan operation to achieve more or less airflow. This is done right at the thermostat. SmartEvapTM — This feature allows your system to reduce summertime humidity levels by nearly 10% over standard systems. Media Filter Cabinet — Enhanced indoor air quality in your home is made easier with our media filter cabinet–a standard accessory on all Deluxe furnaces. When installed as a part of your system, this cabinet allows for easy and convenient addition of a Carrier high-efficiency air filter. Control Center — Microprocessor controls sequencing and furnace operation. Equipped with a component test feature and status indicator light to assist in troubleshooting. Microprocessor controls blower times to start blower after main burners ignite to eliminate cold air blowing into rooms. Warranties — Limited Lifetime Warranty on the heat exchangers for the lifetime of original owner in single family residence; twenty years in other residential and commercial applications. Five-year Limited Warranty on entire unit. Contact your dealer for details. A05069 A UNIQUE SEER SOLUTION The Performancet Boost 90 is an exciting addition to your product line.