Wide Application: Operating at a low noise level, this wall exhaust fan can be effortlessly installed in garages, workshops, chicken coops, sheds, attics, greenhouses, offices, hospitals, and theaters. You only need to allow for the proper installation thickness to complete the setup. Automatic Shutdown: The high-quality materials used in the housing and grille ensure that the fan maintains excellent performance even in harsh weather conditions like rain and snow. The louvered fan automatically shuts down during the winter when not in use to help maintain indoor temperature. Steel Mesh Screen: This wall vent fan includes an upgraded, detachable steel mesh screen designed to safeguard your home against external debris. For installation, kindly use the provided gloves to prevent injury. We chose not to pre-assemble the screen, giving you the option to decide whether to use it or not. High Performance: The HG POWER exhaust fan is an upgraded iteration of existing similar products, boasting a high airflow of 753 CFM（1250 m³/h） , a high speed of 1400 RPM , and a low power consumption of 27 Watts . This combination renders the fan both potent and energy-efficient, capable of circulating significant volumes of air. NOTE: This basic model doesn't include a speed control switch or plug. You'll need to purchase a plug before using and wire it yourself. New Version: What are the differences between the new version and the old one? Firstly, in terms of material, the new model uses full metal material. The louvers, mesh cover, fan body, and even the connecting parts are all made of metal, ensuring a more sturdy product and reducing the possibility of deformation during transportation. Additionally, the new version also features an upgraded motor, providing a longer lifespan.