AprilAire’s 6506 round ventilation damper is designed to help balance air intake and exhaust in hydronic and forced-air systems. Its compact round form supports versatile installation in ducts and plenums, making it a popular choice for retrofit projects and new builds alike.

Key specifications

The 6506 features a round duct connection, a durable damper blade, and a low-leak design intended to minimize backflow. Typical materials include corrosion-resistant components suitable for frequent cycling. Check product sheets for exact diameter, blade material, and actuation options compatible with your system.

Technical specs such as maximum static pressure, expected airflow range, and installation clearances will influence selection. Always verify with the current manufacturer documentation or an HVAC professional to ensure compatibility with your ductwork and zoning strategy.

Installation considerations

When installing the 6506, ensure alignment with the duct axis to avoid binding and ensure a tight seal at both ends. If your system uses an actuator or control damper integration, confirm electrical compatibility and any required control wiring or wireless interfaces. Proper mounting helps minimize noise and vibration during operation.

Consider the damper’s placement in relation to other components, such as filters, bends, and turns, to maintain even airflow and reduce pressure drops. For retrofit applications, plan for access to the damper blade for future maintenance and inspection.

Maintenance is typically straightforward: inspect seals and linkage periodically, clean any dust buildup, and verify that the damper opens and closes fully without obstruction. Replacing worn gaskets or seals can help preserve efficiency and prevent air leakage.

Availability and pricing can vary by supplier and region. If you’re upgrading a system or designing a new installation, consult with an HVAC professional to determine if the 6506 best fits your airflow requirements and zoning plan. This damper is commonly used in residential and light commercial applications where reliable, controllable ventilation is needed.