Check the listing for details. 4 Inch Round Air Vent Covers, 2pcs Ceiling Ball Jet Nozzle Air Diffuser, White. Condition: New. Listed at 27.03 USD. This ball jet air diffuser is specially designed to be used in rooms that require a high airflow capacity. Airflow rate and flow direction can be adjusted by rotating the inner ball core which is 360 degree adjustable.The round air vent is widely used in living room, kitchen, bathroom, office, closet for air ventilation purpose. Their decorative design adds a touch of elegance to the building.SpecificationSize: Total Size: 138 x 57mm / 5.4 x 2.2 inch (Dia.* Mounting Depth)Height: 72mm / 2.8 inchOpening Dia.: 96mm / 3.8 inchCenter Hole Diameter: 45mm / 1.8 inchMaterial: ABS PlasticColor: WhitePacking List: 2 x Ball Jet Air Diffuser.AdvantageExperience the advantages of our Round Air Vent. With their adjustable air volume feature, you have full control over the airflow in your space.