VENTS UK Vents 4 inch 100 mm Black Plastic Fixed Blade Grille with Fly Mesh 4 inch Rear Spigot for Internal External Air Vent Cover Wall Ceiling Mounting Louvre Grill Insect Screen Bathroom Ventilation

VENTS UK 155x155mm Size Slim Black Wall Vent Grille Cover with Insect Screen Fly Mesh for up to 100 mm Vents 4 Fresh Air Flow Outlet or Inlet Duct to fit 3 or 4-inch Ventilation Louvre Outdoor External Grill

Prostko LTD Brown Round Air Vent Grille 100mm / 4" inch – with Fly Screen/Anti Insect Mesh – Circle Ducting Ventilation Cover.

Awenta Plastic Air Vent Grille Cover 100 mm 4 inch, White with Insect Grid Fly Net, Screw Hole Covers for Better Look

Awenta Plastic Air Vent Grille Cover 300x300mm 12x12 inch, Black with Insect Grid Fly Net, Screw Hole Covers for Better Look

Steinberg14 Black 100mm Air Vent Cover with Insect Mesh 4 inch Round Air Vent Covers for Walls and Ceilings Air Vents for Interior Walls Plastic Ventilation Grille

Awenta Plastic Air Vent Grille Cover 200x200mm 8x8 inch, Black with Insect Grid Fly Net, Screw Hole Covers for Better Look