Although this product is new and unused, there are minor scratches from storage. Please refrain from purchasing if you are concerned about this. Intake/Exhaust Window Mount Ventilation Fan - Easy to Use: Unlike general ventilation fans, this fan from our company can both exhaust and intake air. It not only exhausts smoke and other pollutants, but also brings in cool air in the summer and speeds up air circulation in the winter, relieving stuffy air. You can easily operate the fan with the shutter and pull cord switch. Pulling the cord the first time turns the fan on and exhausts air outwards. Pulling the cord a second time reverses the direction, drawing air inwards. Pulling the cord a third time turns the fan off and closes the shutter. ★ High Airflow & Dimensions: Exhaust volume 500m³/h, intake volume 380m³/h. High speed and stable performance due to the thickened blades. Dimensions: 300 x 300 x 143 (mm), Blade diameter: 200mm, Mounting hole size: 240mm. ★ Overheat Protection, Low Noise, Low Power Consumption: Equipped with a high-performance thermal fuse for overheat protection, ensuring safer use. The ventilation fan's dedicated bearing motor is made of high-quality materials, offering quiet operation, a long lifespan, and stable performance.