Description
【Excellent Airflow】Hon&Guan 4 inch roof vent with backdraft damper still have an airflow of UP TO 75%, while other products on the market have an airflow of less than 50% and poor ventilation..【Corrosion Protection】High-quality galvanized steel to ensure durability and long-lasting use. The high-performance polyester powder coating has strong corrosion resistance and excellent corrosion protection..【Home Guard】The roof vent 4 inch comes with a 120mm*90mm mesh cover, with a grid gap of about 3mm to effectively prevent the entry of small animals or birds..[Low Nosie Silencer]: Designed for reducing noise from fans and carbon filter systems, can decrease the noise by up to 50%..[4" Ducting Lightproof]: Thick layer of Black PVC on Hon&Guan ducting prevents light leaks. Works with exhaust and intake fans, carbon filters and hooded lights which are 4" in diameter
