Quiet Actparticlemail: Armed with a spume insulation layer to minimize noise and throb, ensuring quiet execution at low operating pace for home and use Permanent & Easy Installatparticlemail: Constructed of powerful steel for permanent durability; lip plan with 4 pre perforated cavities ensures quick and secure installation in round ducts Efficient Ventilation Planumberepeat: The anthracites steel exhaust diffuser is developed for residential,, kitchen, and bathroom ventilation arrangements Modifiable Ventilation Control: Features a manually modifiable gate protect, allowing users to easily regulate ventilation by whirling the gate to increase otherwise decrease the opening for optimal ventilation Modern Aestheticreatemail: Features a smooth steel body with a carbon gray gate protect, blending seamlessly with various interior fashion for a strengthened visual appeal, Manufacturer: Dezzhou