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Filament › Cooling› Exhaust fanduring_print_exhaust_fan_speed

Fan speed

Speed of exhaust fan during printing.This speed will overwrite the speed in filament custom gcode

Not shown with the A1. Bambu Studio hides this setting when the printer can't use it. The A1 is open (no heated chamber or air filtration), has a single extruder, no fast purge and no prime tower interface layer. It shows up with printers that have them.
This page isn’t written yet. Above is the official Bambu Studio description; the plain-words explanation, the interactive example and the typical values will come later.

Setting details

Where it is
Filament › Cooling › Exhaust fan
In the factory profile
70 %
Program default
60 %
Type
Ints
Unit
%
Range
0 – 100
Visible in mode
Simple

Read more at the official source

Bambu Lab wiki (index)
In your profileBambu PLA Basic @BBL A1 · 70 %

In Bambu Studio, the profile Bambu PLA Basic @BBL A1 sets it to70 %

Using another slicer? Look for the idea, not the name: in Orca Slicer almost everything has the same name; in PrusaSlicer or Cura it may be called something else, or not exist.