VEVOR Shutter Exhaust Fan, 305 mm with Temperature Humidity Controller, EC-motor, 904 CFM, Variable Speed Adjustable Wall Mount Attic Fan, Ventilation and Cooling for Greenhouses, Garages, Sheds

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.,High Performance: The HG POWER exhaust fan is an upgraded iteration of existing similar products, boasting a high airflow of 904 CFM（1500 m³/h） , a high speed of 1650 RPM , and a low power consumption of 40 Watts . This combination renders the fan both potent and energy-efficient, capable of circulating significant volumes of air.,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.,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.,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.