1: fn+f12
2: Find the line that says (div id ="maincontainer") and click the down arrow
3: In that, find the line that says (div id ="maincontent") and click the down arrow
4: In that, find the line that says (div class ="cbi-map" id ="cbi-miner" and click the down arrow
5: In that, find the line that says (fieldset class ="cbi-section" id = "cbi-bmminer-bmminer") and click the down arrow
6: In that, find the line that says (fieldset class ="cbi-section" id = "cbi-bmminer-default" style ="display:none) erase the :none to leave just "display" and
click the down arrow
7: In that, find the line that says (div class = "cbi-value" id ="fan_crtl" style = "display:none" erase the :none to leave just "display"
You should now see the fan speed percentage in the gui. Just click the box, set it to the number of your choosing (70 -75% seems to be good for my set up in a noise vs heat situation) and hit Save&Apply
Done!
Here are the pics if that helps https://imgur.com/a/hEn4k
Thanks for this. I use this all the time now. I corrected a small typo above in "maincontainer"
Also, for the newbies, you have to first open the "Miner Configuration" tab. In Chrome, you can just mouse over the code and the window to the left highlights the area affected. To edit, right click to select edit as HTML, then you can just edit like any other text.
If you make a mistake don't worry, just exit and reload the page to start over.