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Bard part 135-183 is an OEM Inner Air Baffle used in Bard wall mounted HVAC equipment to guide internal airflow through the cabinet so air moves where it is intended across the heat exchanger and coil area, helping the unit maintain proper temperature rise, efficiency, and stable operation. When a baffle is missing or damaged, airflow can short cycle inside the unit, leading to performance complaints and nuisance issues. Replacing with the correct Bard factory baffle restores the original airflow path and fitment, making it a smart choice for service repairs when you want the unit to operate the way Bard designed it.