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The Trane BLW01335 inducer blower fan pulls combustion gases through the heat exchanger and out the flue, ensuring safe, efficient venting on startup. When it fails you may notice the furnace not igniting, a locked-out control board, or loud rattling and humming from the burner compartment. This OEM assembly is engineered for a direct fit and correct pressure-switch operation in compatible Trane furnaces.