AC Infinity T6 noise

Recently bought myself a T6 for silent grows, but I'm noticing a noise coming from the vent. It sounds like a dry water pump. Is it normal or should I look to send it back? I contacted their customer support, but no answer.

A video for demonstration: https://www.youtube.com/shorts/Bx0KoCLxdoI

Edit: Is broken

Just for the record. Their customer support was top notch and they sent me a new fan.

And their fan is top notch, would recommend to everyone.