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Weiworld Passive Air Vent 4Inch For Fresh Air Environment Energy Efficient Fresh Air Intake Come With Aluminium Telescopic Duct, Signal Boosters Optiscope Military-Grade MagnificationPassive Ventilation Systems Use A Series Of Vents In Exterior Walls Or At Exterior Windows To Allow Outdoor Air To Enter The Home In A Controlled Way. Natural Airflow, Wind And The Temperature Differences In Indoor And Outdoor Air Help To Draw In Fresh Air And Circulate It Through The Home.