The Vevor 4-inch square wall vent cover is designed to improve airflow in spaces such as bathrooms, kitchens, garages, basements, dryers, and pet rooms. Made from SUS304 stainless steel, it offers durable, weather-resistant performance with a louvered flap design for added outdoor protection. Rubber gaskets help reduce operating noise, while the narrow opening helps deter unwanted pests from entering the duct. It is compatible with flexible and rigid ducts, though a vent hose is not included. Pre-drilled holes make installation easier on stone, brick, wood, or concrete walls.