this is an OEM replacement part designed specifically for Carrier

Model-Specific Engineering: Validated specifically for Weil McLain GV-5 series boilers to ensure repeatable manifold pressure settings

You'll typically measure the open circuit millivoltage

including 621957

simplifying the replacement process

Carrier LA01EW038 Fan Blade 318973-401 this is an OEM replacementEnsure maximum condenser performance with the Carrier LA01EW038 Fan Blade, a heavy duty OEM replacement fan designed specifically for Carrier, Bryant, and Payne commercial and industrial units. This 4 blade assembly features a 30 inch diameter and a steep 36 degree pitch, engineered to move high volumes of air efficiently while maintaining static pressure balance. Built for rigorous service in manufacturing facilities and large scale HVAC systems, the