In the specification, the sound level is 69.9 dBA and I checked with the customer service that the range is 58.5-69.9 dBA (1-3 speeds). Mine actual sound is from 72 dBA-82 dBA 

I talked with customer service again about the loud sound and here is the reply. 
"This may just be how they are manufactured, and unfortunately, I do not manufacture the units. I have no other suggestions as to why it is louder than specified"

Given there are so many people complaining about the loud sound, I am very confused why the specification is so different from the actual sound level.