Customer Questions and Answers for Microwave Charcoal Filter by Bosch

This is a charcoal air filter used in over-the-range microwaves to absorb odors, smoke, and grease from cooking exhaust when the unit is not vented to the outside. It sits behind the vent grille area of the microwave. Replace this filter if you notice lingering cooking odors, reduced airflow from the vent, or if it has been more than six months since the last replacement.