LangRay Stainless Steel Round Vent, Ventilation Grille Round Exhaust Air Circulation for Bathroom Office Head Space - 80mm f74 Installed in the exterior wall, you avoid pests with a stainless steel mesh in the room. Stainless steel wall vents with mesh - Wall ventilation grille for intake air or exhaust. Stainless Steel Ventilation Grille. Maintain Air Circulation A ventilation duct can be fixed inside the wall (this product is not suitable for indoor installation, choose the new outlet): stainless steel outlet (flat mouth)< /p> - Installed in the exterior wall, you avoid pests with a stainless steel mesh in the room - Stainless steel wall vents with mesh - Wall ventilation grille for the intake or exhaust air. - Stainless Steel Ventilation Grille. Maintain Air Circulation - A ventilation duct can be fixed inside the wall (this product is not suitable for indoor installation, choose the new outlet): stainless steel outlet (flat mouth) Note: The data is manual measurement, please allow 1-51cm error, due to differences between light and screen, there will be a certain color difference, the specific received in kind shall prevail.