The M-4DBT Automatic Dryer Booster Exhaust Fan is a 4" white-colored blower designed for indoor use. It has an air flow capacity of 200 cfm and a plug-and-play installation type, making it easy to set up. This fan booster from China is specifically designed to enhance the efficiency of your automatic dryer, ensuring a properly ventilated space. With a unit count of 1, this product is a reliable and convenient addition to your home appliance collection.