The Broan S97020971 Exhaust Fan Blower Assembly effectively remove moisture and odors by pulling air through the fan blades and pushing it out through ventilation system. This replacement blower assembly ensure that the right amount of fresh air is circulated in the house to eliminate humidity that causes mold and mildew formation. https://www.hnkparts.com/S97020971-BROAN-SWS-BLOWER-ASSEMBLY