Samsung ME19R7041FS OTR Fan in Recirculating Installation: Check Airflow Direction Safely
For a Samsung ME19R7041FS installed as a recirculating OTR microwave, the vent fan should return cooktop air to the kitchen through the microwave's recirculating outlet rather than send it through an outside duct. Samsung's exact-model installation guide lists recirculating as one of three ventilation configurations and requires the charcoal filter for the non-vented setup; its recirculating configuration also changes the blower orientation.
Samsung · Microwave · Appliance Repair