This HVAC circuit board replacement integrates a 3-amp blade fuse for low-voltage circuit protection and features onboard diagnostic LEDs that simplify fault code interpretation in the field

you must verify that the 9-inch diameter and 6-inch width clear your existing blower housing and that the rotation matches your original fan

maintaining the thermal efficiency of the heat exchanger by ensuring consistent air distribution across the coil

Enhanced Airflow Precision: Calibrated specifically for induced draft systems to prevent pressure switch trip-outs

Techs will appreciate the straight-thru design and the inclusion of reducer bushings for versatile 1/2" x 3/8" applications

Lennox 78F43 Blower Shaft R-410A This HVAC circuit board replacementThe Lennox 78F43 Blower Shaft (OEM Model LB 50255C) is a critical mechanical component engineered for heavy duty application in industrial and residential air handling units. Machined from high grade C1045 carbon steel, this 1 inch diameter shaft is designed to withstand high torque loads and continuous rotational cycles within the blower assembly. With a precision cut length of 27. 25 inches, it features a standardized 1 4" keyway and a flat for