The Broan® direct discharge 180 cfm Utility through-wall fan can be used in rooms up to 170 sq-ft for effective ventilation. The 180 cfm fan helps improve airflow with a powerful 6-1/2 sones motor. The fan is designed with an integrated on/off rotary switch to prevent the need for wall switch wiring. Installation is easy when you combine the 8 in through-wall design with walls 4-1/2 x 9-1/2 in T.