Whirlpool Part Number 8206444A: FILTER THIS WHIRLPOOL 8206444A CHARCOAL FILTER WILL FILTER THE AIR FLOW INTO AND OUT OF THE MICROWAVE. A DIRTY INTAKE FILTER WILL CAUSE YOUR MICROWAVE TO BE LESS EFFICIENT. A DIRTY EXHAUST FILTER WILL NOT ONLY CAUSE POOR EFFICIENCY, BUT MAY ALSO ALTER THE TASTE OR SMELL OF YOUR FOOD.