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Efficiency ratings established per test standard ANSI/ASHRAE 103-1993. Based on AFUE efficiency rating of Lennox SLP99UH090XV60C and leading competitive units listed in AHRI directory as of December 2019. Sound power level data are given for both propeller-type and centrigual-fan cooling towers. *Based on sound pressure levels during steady-state, high-fire and low-fire operation of Lennox® SLP99UH070XV36B as of March 2020 at mid-point temperature rise and minimum external static pressure when set up per Section 4.4.4 of AHRI 260-2012. B.) The axial-flow blow-through type (with the fan or fans located on a side wall) C.) The induced-draft propeller type and D.) The underflow forced draft propeller type (with the fan located under the assembly. The SLP99V gas furnace from Lennox is the quietest and most efficient furnace you can buy,* engineered to run at variable speed to drastically minimize the sound of air kicking on or off inside the home. The Lennox ® SL28XCV air conditioner is engineered with a variable-capacity compressor and a special sound-dampening system which ensures it operates at a noise level that is, quite simply, unheard of. Useful for comparing relative sound output of two fans. An increase in sound pressure of 9-10 dB doubles the sone rating. A value in sones doubles when the sound is perceived as twice as loud. Lennox offers a full line of home heating, cooling and ventilation products that are designed to be as quiet as they are efficient. A sone is a unit of loudness and refers to Sound Pressure (Lp) 1 sone is the loudness of Lp 40 dB re 20Pa at 1KHz. Older furnaces, air conditioners and heat pumps often have relatively high operating sounds, along with the noisy stops and starts associated with single-stage operation. For example, sound levels in a library are normally about 40 dB, normal conversations range from about 50 to 60 dB, and an operating motorcycle or garbage truck can be as high as 100 dB. A decibel (dB) is a unit used to measure the relative intensity of sound.