An exhaust assembly for an appliance includes a filter housing for retaining a filter and an exhaust duct which receives airflow from the filter housing. One or more vanes are positioned in the filter housing for guiding airflow from the exhaust side of the filter to the exhaust duct. The vanes spread the airflow entering the exhaust duct across the width thereof so as to reduce noise and to reduce the velocity of the exiting air. The exhaust duct increases in cross-sectional area in the direction of flow through the exhaust duct so as to further reduce the velocity of the exiting air.