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In order to not damage your machine, Oh My Fan! does not let you set a minimum/maximum speed to a value below/above Apple's defaults.
If you encounter any issue, you can email me: Tong-G@outlook.com.
If you are using GnuPG, you can send me encrypt email, my GnuPG pub key is sosueme@openmailbox.org, you can retrieve it from keyserver.