preventing combustion air bypass and maintaining established flue gas CO2 levels

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Resideo ZD6X12TZ Damper 319825-402 preventing combustion air bypass andThe Resideo ZD6X12TZ Damper is a 6 in. x 12 in. Parallel Blade Damper engineered for rigorous forced air zoning applications. Featuring a 24Vac power closed spring return open configuration, this unit ensures high reliability fail safe operation by maintaining 100% airflow during power loss. The synchronous motor is robustly side mounted on the 12 inch dimension, enabling a low profile fit for tight HVAC zone control installs. Built with an extruded