This is a genuine OEM HVAC replacement part

Always verify the voltage and connection size before installation

shaft adapter

This makes it essential for high-pressure steam and hot water applications where standard valve actuators would otherwise exceed their ambient or process temperature limits

Common Questions: Is the rotation direction reversible for this wheel

Viessmann 7855596 Radial Fan 319825-402 This is a genuine OEMThe Viessmann 7855596 Radial Fan is a precision engineered OEM replacement part designed for Vitodens 100 W B1HA and B1KA series condensing boilers. As a critical NRG118 combustion blower, this component features a high durability die cast aluminum housing and a steel impeller, specifically balanced to maintain the exact air fuel ratio required for efficient premix combustion. Whether you are servicing a B1HA 26 35 or B1KA 26 35 residential wall