The square aluminum automatic gravity louvered ventilation openings, tailored for scenarios such as homes, garages, and greenhouses. This louver is sturdy and durable, made of high-quality aluminum, and has excellent corrosion and rust resistance. The louvers are designed with precision construction, and when closed, they tightly fit together, effectively blocking rainwater infiltration and ensuring stable use even in harsh weather conditions. It has automatic opening and gravity closing functions, easy and labor-saving operation, and can be perfectly matched with motors and fan blades to effectively cool the space and quickly remove excess heat, moisture, and dust. (Warm reminder: The exhaust fan blades and motor need to be purchased separately.) Choose this reliable automatic gravity louver to upgrade your ventilation system and enjoy a more pleasant environmental experience. Color: Silver.