Therwen 6-Inch Backdraft Damper for Ducts – Manual Airflow Balancing for Range Hoods & Fans

Meet the Therwen 6-inch backdraft damper, a sturdy manual regulator designed to help you guide airflow within duct branches for range hoods, exhausts, and other HVAC paths. Its galvanized iron sleeve provides structure and resilience, helping it hold its shape under heat and moisture while remaining accessible for everyday adjustments. The unit is well suited for residential, commercial, and light industrial settings, offering a practical option for balancing air in active spaces without fully sealing off a duct.

Key design features and durable construction

• Diameter and fit: bend end interface around 5.87 inches and the opposite side about 6 inches, with a height near 6.25 inches, designed for 6-inch ventilation ducts.
• Robust material: galvanized iron sleeve provides high hardness and heat resistance, helping resist deformation and moisture-related wear.
• Not a sealant solution: the damper is not intended to terminate airflow but to assist with air balancing across branches.
• Manual adjustment: regulate airflow by repositioning the damper to direct air where needed within a duct network.
• Long-term performance: corrosion resistance and durable fabrication support reliable operation over time in typical HVAC environments.

Easy installation and practical maintenance

Installation is straightforward: slide the damper into the pipe, secure it in an adjustable position, and hide the seam with tape. For best results, seal all connections with pipe sealant to minimize air leakage and improve overall HVAC efficiency.

Applications and real-world uses

Ideal for a range of applications including air conditioning lines, dryer vents, exhausts, range hoods, and heating systems. This 6-inch damper fits common ductwork and can be used across residential, commercial, and light industrial settings to help balance air flow across multiple locations in a building.

• Promotes targeted airflow to specific rooms or zones, supporting comfort and efficiency.
• Supports simple retrofits in existing 6-inch duct networks without major remodeling.
• Offers a tangible, adjustable option for balancing pressure differences between branches.

What you can expect in practice

With the Therwen damper, you gain a practical tool to fine-tune how air travels through a duct system. Use it to shift air toward areas that need it, reduce unwanted drafts, and maintain steadier performance across your HVAC setup. Consider it a flexible component for hands-on balancing rather than a one-size-fits-all solution.