9 Cv rating and equal percentage plug design provide superior linear heat output in water and steam applications

As a direct factory replacement for discontinued part numbers 265-42034-00 and 219-40360-00

Combustion Optimization: Prevents excess air infiltration

it is not recommended

Resideo ZD10X20TZ Damper 328140-751 9 Cv rating and equalProfessional grade zoning requires reliability, and the Resideo ZD10X20TZ delivers with a heavy duty parallel blade zone damper design. Engineered for high performance HVAC zoning systems, this 20 inch by 10 inch rectangular unit features a 24Vac synchronous motor mounted on the 20 inch side for streamlined installation. The power closed spring return open configuration ensures a fail safe normally open state, maintaining airflow if power is lost.