Resideo ZD12X8TZ Damper R-448A Smith 100109833 Valve is a

Smith 100109833 Valve is a critical OEM replacement component designed for high-performance commercial and residential water heaters and boilers

among other high-back-pressure applications

BOARD ECONOMIZER RRS BASIC S1-031-03645-000

3-frame motor from damage during extended run cycles

Resideo ZD12X8TZ Damper R-448A Smith 100109833 Valve is aThe Resideo ZD12X8TZ is a professional grade 12x8 zone damper designed for precision airflow control in multi zone HVAC systems. This parallel blade damper features a heavy duty galvanized steel construction with a synchronous motor mounted on the 8 inch side for high torque reliability. Engineered as a power closed spring return open actuator system, it ensures the zone defaults to the open position during power loss, maintaining critical airflow.