All stainless steel construction. 5 cubic foot square hopper with pneumatic rotary vibrator. Upper section has a hinged side inspection panel, 4" vent port with sock, & 16"Ø flanged inlet. Hopper assembly measures 57.5" from floor to inlet flange. The 1HP inverter-duty flex screw power head fits a 3"Ø screw and flex tube (screw & tube not included). It requires 208-230/460 volts, 3 phase power. Output auger speed = 358 RPM.