how do i turn on my exhaust fan maually?
if you mean the one in the glowforge itself… you don’t.
If you mean an external one you have… with your fingers on a switch. 
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Go into area that you load up a design & click on the 3 dots., then deactivate the air filter & the exhaust fan should be ready to run.
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The exhaust fan should default to on. If it doesn’t, it means that the air filter toggle has been turned on. From the interface, click the three dots and make sure that the air filter toggle is off which means that the internal exhaust fan will be on.
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You can use this link to turn the fan on for maintenance, if that is what you’re looking for:
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