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【Gravity Self Closing Blade Design】This external gravity grille adopts UV-resistant PP self-closing blades opening with airflow and closing tightly at rest. The 100mm vent cover blocks wind dust and rain to protect indoor ventilation pipes 【Integrated Insect Protection Structure】This black duct grill is fitted with built-in pest guard screen and fine fly screen to isolate bugs and sundries. The sturdy net ensures smooth airflow and strengthens sealing for wall ventilation outlets 【Standard Caliber Stable Matching】Designed with round rear spigot, this air vent fits 4 inch 100mm ducts perfectly. Standard size matches mainstream pipelines for household exhaust and ventilation 【Multi Scene Ventilation Application】This wall-mounted air vent cover works perfectly for bathroom fan exhaust and tumble dryer vents covers, meeting daily indoor and outdoor wall ventilation demands 【Effortless DIY Wall Installation】Lightweight anti-corrosion PP ensures outdoor durability pre-drilled holes and screws enable fast installation of this practical wall air vent for home renovation