These two part numbers are identical in technical specification and performance

this wheel features a CCW (counter-clockwise) rotation when viewed from the back

For technicians performing HVAC system troubleshooting

The blades are pitched at 34 degrees to maximize CFM output while minimizing decibel levels and vibration-induced wear on the motor bearings

The EM3311T features a dual-voltage design for 230V or 460V three-phase power

Omron ZE-NJ-2S Basic Switch 319825-402 These two part numbers areThe Omron ZE NJ 2S Basic Switch is a high performance enclosed limit switch engineered for precision sensing in demanding HVACR and industrial control applications. This SPST NC (Single Pole Single Throw Normally Closed) switch is rated for 15Amp at 250Vac, providing robust electrical switching capacity for heavy duty cycling. Featuring a side mount coil spring actuator, the ZE NJ 2S excels in detecting multi directional movement or irregular objects,