4in Motorized Duct Damper-Adjustable Volume Balancing & Backdraft Damper Control,Airflow Control Da Premium Stainless Steel Construction: Crafted from good-quality stainless steel, this 4-inch motorized duct damper excels in environments ranging from -10C to 70C. Its robust design ensures durability and resistance to humid conditions, outperforming standard galvanized iron alternatives. Efficient Motorized Adjustment: Equipped with a 24V AC motorized actuator, this damper offers precise 0-90 stepless air adjustment. Experience quiet, smooth operation that allows for optimal control of airflow without disruptive noise, enhancing overall system efficiency. Enhanced Airtightness with Silicone Seal: Featuring a built-in rubber sealing ring, our duct damper guarantees exceptional airtightness. This design prevents air leakage whether the damper is fully open or closed, contributing to quiet operation, increased comfort, and energy savings. Easy Installation Process: Installing this duct damper is straightforward-simply insert it into the duct, secure with screws, and seal the seams with tape. For enhanced performance, applying duct sealant is recommended, ensuring a sealed, efficient HVAC system and a smooth installation. Versatile Application for Various Settings: Ideal for use in both residential and commercial environments, this damper adjusts airflow and direction in fresh air systems, air conditioners, and exhaust ducts. It significantly boosts energy efficiency across multiple scenarios, making it a universal solution for HVAC needs. Color: As Shown Material: Stainless Steel Size: outer diameter 10cm; length 15cm Package Contents: 1 x valve Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.