this assembly is specifically orificed and configured for LP gas only

As a direct replacement for the legacy 40-4A3-3AM

and Armstrong units

Robust automatic gas shut-off mechanism prevents gas accumulation if the pilot flame is extinguished

Rated for both 370V and 440V systems

Zonefirst ZDS-30X12 30WX12H Parallel 24V 2-Pos S/R 30067439-890 this assembly is specifically orificedThe Zonefirst ZDS 30X12 is a professional grade rectangular zone damper engineered for high performance airflow management in residential and commercial HVAC zoning systems. This side mount (ZDS) model measures 30"W x 12"H and features an extruded aluminum frame with 3" parallel blades, ensuring minimal air pressure drop and smooth, silent operation. Equipped with a 24V spring return (S R) motor, this 2 wire actuator is designed for a power closed