WeCooper 304 Stainless Steel Gravity Grille 100mm 4 inch Ducting Air Vent Cover with Not-Return Shutters

4 Inch (100mm) Stainless Steel Round Cowl c/w Internal Louvre & Mesh

Repa Market 4 Inch (100 mm) Stainless Steel Round Air Vent Cover/Extractor Fan Vent Cover/Louvered External Vent Cover with Rubber Seal and Mesh Screen/Air Intake & Exhaust Ventilation Grill