This is an ebm-papst RadiPac EC centrifugal plenum fan ("plug fan") built around an integrated GreenTech M3G150 electronically commutated (EC) motor. The EG1R-480-500-13 designation decodes from the ebm-papst RadiPac scheme as a backward-curved, single-inlet centrifugal module rated for 400 to 480 VAC (the "480") with a 500 mm fan wheel (the "500"). The companion nameplate part M3G150-FF25-64 identifies the drive itself: a Generation 3, size 150 EC motor, which is among ebm-papst's larger high-power EC units in this family.
 

These units are designed for air handling units (AHUs), rooftop units, and large building ventilation and air conditioning systems. They run on 3-phase 380 to 480 VAC with integrated active PFC (power-factor correction), so they draw near-unity power factor and avoid harmonic-filtering hardware. They feature maintenance-free ball bearings, continuous-duty (S1) operation, a glass-fiber-reinforced composite impeller, and onboard control inputs (0 to 10 V, 4 to 20 mA, digital). ebm-papst rates this series at roughly IE5-equivalent system efficiency.