Check the listing for details. 1Set Vent Cover with Built-in Screen Mesh (4" OD) - Square Louver Air Wall Vent. Condition: New. Listed at 16.54 USD. [WHAT TO GET]: This square louver air vent cover with screen mesh provides optimal airflow control while keeping dust and pests out. The reinforced PP plastic construction offers weather resistance and long-lasting performance. Its removable design allows for easy cleaning and maintenance, addressing common vent cover about debris.[WHEN/WHERE TO USE]: Wall vent covers work effectively in HVAC systems, laundry rooms, bathrooms, and kitchens where proper ventilation matters. The grid promotes efficient AC while the mesh screen prevents pests from entering your living spaces. The white finish blends seamlessly with most interior decors.[WHAT IT IS]: Size: 140 x 140 x 50mm / 5.5 x 5.5 x 2 inch (L*W*H); Suitable for Duct opening Size: 100mm / 3.9 inch; Diameter: 96mm / 3.