Description
Tjernlund Products BD-8 BackDraft Damper for 8″ Ducts
The Tjernlund Products BD-8 BackDraft Damper is engineered to prevent unwanted reverse airflow in 8″ duct systems, protecting your HVAC equipment and maintaining proper ventilation performance. Gravity-operated and passively controlled, this damper opens automatically when airflow is present and closes securely when the system is off — keeping conditioned air in and outside air, pests, and drafts out.
Key Features
- Designed specifically for 8″ round duct applications
- Gravity-operated damper blades open with positive airflow and close automatically when airflow stops
- Prevents backdrafting, cold drafts, and reverse airflow infiltration
- Durable construction for long-lasting, low-maintenance performance
- Compatible with exhaust fans, ventilators, and inline duct fan systems
- Easy installation into standard 8″ ductwork
Applications
- Exhaust fan and ventilation duct systems
- Inline duct fan installations
- Kitchen, bathroom, and whole-house ventilation
- HRV and ERV duct connections
- Any 8″ duct run requiring backdraft protection
Why Choose the Tjernlund BD-8?
Tjernlund Products is a trusted name in ventilation and duct accessories, known for reliable, code-compliant solutions. The BD-8 is the ideal passive solution for maintaining one-directional airflow in 8″ duct systems without the need for motors, controls, or electrical connections — reducing installation complexity and ongoing maintenance costs.
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