VEVOR 406mm 1400 RPM 1506 CFM aluminium wandgemonteerde afzuigventilator met AC-motor, ventilatie en koeling voor kassen, garages, schuren, winkels

No, you should not install a potentiometer in the wiring. If speed control is needed, use a proper AC fan speed controller or VFD (if the motor supports it), not a simple resistor/potentiometer.

This product does not come with a plug, you need to wire it yourself.