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The efficient Trane S8B1 3 Ton 48000 BTU 80% AFUE Single Stage Upflow/Horizontal Single Stage Gas Furnace S8B1B060M3PSAA is a one of a kind heating solution from Trane. This heating system is equipped with Silicon Nitride Hot Surface igniter for a reliable ignition throughout the lifespan of the furnace unit. The Multi-Port In-Shot Burner shapes