this direct replacement part is built to original factory specifications

Optimized Combustion: Improves air-fuel mixing to reduce carbon buildup and ensure low NOx performance

but the technical specifications and contents are identical

What is the difference between NEMA 4 and NEMA 4X for this part

The unit is spring return stem up

Beckett Igniter 2458U Blower Wheel 320720-756 this direct replacement part isThe Beckett 2458U Blower Wheel is a precision engineered centrifugal fan component specifically designed for high performance oil burner applications. Measuring 3 3 4 inches by 2 29 32 inches, this replacement blower wheel ensures optimal static pressure and airflow for combustion stability. Designed for compatibility with various Beckett burner chassis, this oil burner blower wheel features a durable construction that resists warping under thermal