Lochinvar & A.O. Smith 100318771 Inducer Assembly 320788-703 It matches the physical footprint

It matches the physical footprint and electrical specs for a drop-in replacement

Using a non-identical part will lead to inaccurate temperature reporting and potential control board malfunctions

this kit includes the Lochinvar flame sensor gasket

Verified Specifications: Red color-coded for quick identification as a 300-degree fixed limit control

The 40003916-024 is technically identical to the 40003916-024/U model

Lochinvar & A.O. Smith 100318771 Inducer Assembly 320788-703 It matches the physical footprintThe Lochinvar 100318771 Inducer Assembly is a critical OEM replacement fan assembly engineered to maintain precise combustion airflow in high efficiency Lochinvar NKC and NKB199 fire tube boilers. As a veteran technician knows, the inducer is the first component to activate in the ignition sequence, purging the heat exchanger of residual gases and creating the negative pressure required to close the boiler pressure switch. This 100318771 blower motor