[High quality material] Round stainless steel cap, nominal width 120mm, suitable for 'evacuation and evacuation air supply. [With mosquito net] Round chimney ventilation grille to prevent the entry of flies and insects and equipped with mosquito net. [Easy to use and install] The external ventilation grille is easy to install and maintain. Slide the external air cover into the ventilation duct and fix it to the wall with screws. [Stable] Round stainless steel vents are suitable for external vents. Indoor and outdoor use. Solid, high quality materials guarantee the stability structural protection of the product and avoid deformation. [Widely used] Supply or exhaust air grilles are ideal for ventilation systems, air conditioning systems, kitchen vents and indoor vents for domestic and industrial purposes.