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Bard part number 9043-009 is an OEM draft diverter assembly (Bard assembly 300458) used on select Bard heating sections to help manage venting by stabilizing the draft and reducing the chance of flue-gas downdrafts that can upset burner operation. When a diverter is rusted, damaged, or missing, you can see nuisance safety trips, rollout concerns, or poor combustion characteristics, so replacing it with the correct factory assembly helps restore proper vent performance and safe, consistent heat operation. Because fit and orientation are critical around the flue outlet, confirm compatibility by matching 9043-009 to your Bard unit model and serial, then install in the same configuration as the original to maintain the intended venting path.