Eclipse furnaces are a dependable, reliant, cost-effective option for residential and commercial use. The internal and external components make choosing the Eclipse furnace the right choice for easy installation, simple maintenance and hassle-free day-to-day living. These 90% A.F.U.E. Two- Stage furnaces have Input rates from 40 to 115 kBTU. The 5 Speed constant torque ECM motor has a variable operating range, which saves energy lowering your utility bills. The direct spark ignition system (DSI) is the most reliable available today, leading to less maintenance. The tight door seal patented air exchanger and case design have one of the quietest operational furnaces in the marketplace. Optional L.P. conversion kit RXGJ-FP15 available for natural gas to propane conversion. Available accessories include Return air box assembly RAB16, return air boxes RAB 17 and RAB 21, Plenum WKDP 20 and filter rack FR1625.