The Square Air Vent Cover is designed for use in air supply and return, exhaust ventilation system.In addition, it can enhance the aesthetic of indoor and outdoor walls or ceilings. Widely used in home, office and factory. Specification Material: ABS Plastic Color: White Overall size: 45 x 45cm / 18 x 18 inch(W*L) Suitable for opening size: 38 x 38cm to 41.5 x 41.5cm / 15 x 15 inch to 16 x 16 inch Screw hole distance: 42.5cm / 16.7 inch Height: 3.5cm / 1.38 inch Package includes:1 x square air vent cover Advantage The plastic square air diffuser is made of ABS plastic, which offers the advantages of oxidation and corrosion resistance. It is lightweight, making it easy to install and dismantle. The surface is smooth, making it easy to clean. It is suitable for most home or office decorate styles. Instruction Please select an appropriate position on the ceiling, wall, or pipe, ensuring that the surface is clean and pre-drilled for screws. Firmly install the vent cover, checking that it is level and flush with the surface after installation. NOTE: Before purchasing, ensure the size of the hole on the wall and ceiling or your duct matches our air vent. Regularly inspect and clean the air vent to maintain optimal performance.