Instruct: Classify Amazon reviews into positive or negative sentiment
Query: noisy, poor build quality

We bought this unit because of some reviews that said it was quiet, but ours makes a fairly annoying buzzing sound. I just peeked inside and realized that two of the screws that hold the fan in place are the wrong size, they can just be pulled out with your fingers! Obviously Avanti does not have good quality control. From the other reviews it seems like some people get a good quiet product, but some people don't....