Some Sunons are very loud, and some are fairly quiet. The models that end in a "1" are loudest (and have the highest airflow). The models that end with a "3" are quieter.
Here's a link to a handy reference chart for Sunon fans. It's nice to keep a printed copy on hand; I do as I use nothing but Sunons.
Anyhow, the 1208PTB2's operating noise level is rated at 32 dBA, whereas the PTB1 is rated at 33, and the PTB3 at 28. As Mike said, your's is in the middle of the noise range.
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