Hello,
Thank you for reaching out and bringing this to our attention. I understand you want to know the noise level of the fan on the highest and lowest settings. We are here to help.
To answer your question, microwaves make all kinds of sounds while running. Most of these are normal and should not be a cause of concern. Food and other material in the microwave are typically the sounds you're hearing.
I am providing this link https://www.samsung.com/us/support/troubleshooting/TSG01001968/ to guide you on the issue.
Another link you may find useful is this one https://www.samsung.com/us/support/search/?query=microwave&referrerPageUrl=https%3A%2F%2Fwww.samsung.com%2Fus%2Fsupport%2F as it has all the troubleshooting guides, links, videos, and other resources you might need for your Samsung microwave.
Should you need more assistance, please feel free to get back to us via the following options:
1. Facebook Messenger: http://m.me/samsungsupport
2. Twitter: https://twitter.com/messages/compose?recipient_id=18768513
3. Samsung Community: https://us.community.samsung.com/t5/Samsung-Community/ct-p/us
Your reference number is 1144549839.
-Noraina