Adjustable Removable Ceiling Round Diffuser 200mm/300mm Diam Air Vent Diffuser Ceiling Ventilation Air Duct Vent Covers White - Pipe Fittings - AliExpress
Venti Air 12 in. x 12 in. Aluminum 4-Way Diffuser/Register/Grille for Air Supply HA4D12 - The Home Depot
Amazon.com: 6" w X 6" h 4-Way Aluminum Curved Blade Adjustable Air Supply HVAC Diffuser - Full Control Vertical/Horizontal Airflow Direction - Vent Duct Cover [Outer Dimensions: 7.65" w X 7.65" h] :
China HVAC Aluminum Supply Square Ceiling Diffuser Air Diffuser for Ventilation - China Square Diffuser, Air Diffuser