Systemair 411113 Backdraft Damper 5 Inch Circular Duct

Product Description

The SYSTEMAIR 411113 is a 5-inch backdraft damper designed for circular duct systems in residential and light commercial ventilation applications. It prevents reverse airflow when fans or ventilation equipment are not operating, protecting duct integrity and maintaining system efficiency. The damper installs in-line within round ductwork and is suitable for exhaust, supply, or makeup-air runs where backflow control is required. Weighing 1 pound and manufactured in the USA, this single-piece unit is a straightforward drop-in component for HVAC technicians and sheet metal contractors working with 5-inch round duct systems.

This backdraft damper fits circular duct configurations commonly found in bathroom exhaust systems, kitchen ventilation, dryer booster setups, and general HVAC exhaust runs. It is appropriate for both new construction and retrofit installations where a 5-inch round duct diameter is present. HVAC service technicians and mechanical contractors typically specify this damper when passive backflow prevention is needed without introducing significant static pressure drop into the system.

Key Features

• 5-inch diameter sizing for direct fit in standard circular ductwork
• Passive backdraft prevention — no power or actuator required
• Manufactured in the USA
• Lightweight single-piece construction at 1 pound
• Suitable for exhaust and supply-side circular duct applications

Compatibility

Designed as an OEM-style replacement or new-installation backdraft damper for 5-inch circular duct systems in residential and light commercial HVAC, exhaust, and ventilation applications.

Installation Notes

Installation is performed by licensed HVAC technicians or qualified sheet metal contractors. De-energize all associated fans and ventilation equipment before beginning duct work. Secure the damper in the correct airflow orientation as indicated by the unit — installing it backward will defeat backflow protection. Follow applicable mechanical codes, including ASHRAE 62.2 and local jurisdiction requirements, for ventilation system components.

Technical Specifications

• Duct Diameter: 5 inches
• Duct Type: Circular
• Product Height: 5.9843 inches
• Product Width: 7.007 inches
• Weight: 1 pound
• Country of Origin: USA
• UPC: 65073769050

Standard Information

• Brand: SYSTEMAIR
• Manufacturer Part Number: 411113