Weiworld 4 Inch Passive Air Vent, Adjustable Airflow Ventilation Kit 100 mm with Extendable Duct - Natural Fresh Air Exchange for Home, Bedroom, Attic (No Motor)

Weiworld 4 Inch Passive Air Vent, Adjustable Airflow Ventilation Kit 100 mm with Extendable Duct - Natural Fresh Air Exchange for Home, Bedroom, Attic (No Motor)

• Passive Fresh Air Ventilation – No electricity, wiring, or fan required. This passive air inlet uses natural wind and indoor-outdoor pressure differences to help bring fresh outdoor air into enclosed spaces, supporting steady air circulation in basements, attics, crawl spaces, garages, utility rooms, and other areas that need additional airflow
• Adjustable Airflow Control – The indoor panel features an adjustable air inlet for different ventilation needs. Simply remove the front cover, then press and rotate the inner dial to adjust the airflow level
• 4" / 100 mm Through-Wall Duct – Designed with a 4 inch / 100 mm duct diameter for standard through-wall air inlet installation. The telescopic duct adjusts from 7.1 to 13.4 inches in length, making it suitable for wall thicknesses from 7.1 to 13.4 inches
• Built-In Filter for Stable Airflow – The internal filter helps reduce dust, debris, and larger particles from entering the room while supporting smooth and consistent airflow. The removable design also makes routine cleaning easier
• 45° Rain-Resistant Outdoor Cover – The outdoor louvered cover features a 45° angled design to help prevent rainwater from entering the duct while still allowing outdoor air to pass through
• Durable ABS Indoor Vent Panel – Made with durable ABS material for long-term indoor use. The clean square design blends well with home interiors and provides a neat finish for through-wall ventilation
• Easy Through-Wall Installation – Designed for standard 4 inch wall vent installations. Drill a 110 mm hole, insert the telescopic duct, and secure the indoor panel and outdoor louvered cover with the included screws