Polished Brass LOUVRE Grille Vent Ventilation Cover 9 X 3 INCH (Pack of 25): Amazon.co.uk: DIY & Tools
Solid Brass Hit & Miss Vent Ventilator Open Closed Shut Air Flow Grille Cover 225mm x 225mm from Ironmongery Hardware Online: Amazon.co.uk: DIY & Tools
Round Brass Hit and Miss Vent Grille 4 inch | #249065812
Vent cover grille type B - polished brass 152mm x 10mm N73020R | eBay