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The genuine OEM Trane BLW00335 draft inducer motor assembly pulls combustion gases through the heat exchanger and safely out the flue on startup. When it fails, you'll notice the furnace won't ignite, locks out on a pressure switch fault, or runs with loud rattling and grinding noises. This factory assembly is engineered to match the airflow and pressure specs of your Trane furnace for proper, safe combustion.