Vent Cover Size: Package contains 1 piece air vent covers, if your duct hole opening length 11.75 to 12.25 inch and width 3.8 to 4.25 inch,the air vent size we recommend you to choose is 12x4 inch 3-way Ventilation Design:Each ac vent cover is 3-way design,effectively promotes air circulation,keeps indoor air fresh,and allows you to enjoy a comfortable environment Adjustable Airflow: Perfectly suited for use in home ceiling and wall with central air conditioning systems,this vent cover helps to regulate air flow and maintain a comfortable indoor environment.The ac vent features adjustable airflow,allowing users to flexibly adjust the size and direction of the air according to their needs Metal Material:The vent cover is made of metal material,which can withstand cold and heat without deformation,and ensure long-term and stable use Easy Installation and Cleaning:The air return vent cover is easy to install with 2 mounting screws. Cleaning is also simple as it can be easily disassembled for washing,ensuring a hygienic and clean environment for a healthier living space