OD51-250mm electric air duct damper valve engineered for HVAC ducting systems. Constructed from durable 201 stainless steel, this motorized damper provides reliable air flow control in residential and commercial applications. Features dual voltage actuator compatibility with AC220V, DC12V, and DC24V operation, offering flexibility for various installation configurations. The 250mm diameter sizing accommodates standard ductwork dimensions. Ideal for zone control, energy efficiency, and system balancing in heating and cooling networks.