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# Description Re-Creation of Pull Request #6964 with X1E changes pulled. OrcaSlicer includes exhaust fan settings for each filaments, however these settings do not take effect on Bambu Labs machines that include chamber temperature regulation fans.  Further investigation into the g-code files produced reveals that the filament start g-code is responsible for using the air filtration setting and sending the appropriate `M106 P3 S{during_print_exhaust_fan_speed_num[current_extruder]}` command to the printer. However, this command, even with the setting enabled, is never written to the final g-code file. By default, Bambu Lab's filament profiles wrap this command up in` {if activate_air_filtration[current_extruder] && support_air_filtration}` clause, which always evaluates to false. As it turns out, the printer's have the `support_air_filtration` flag set to `0` in the `fdm_machine_common.json` file. This change updates that value to `1` in the .json files for the X1, X1C, X1E, and P1S 0.4mm nozzles. This is then inherited to other nozzle sizes and user generated profiles. This is done by simply adding a line ` "support_air_filtration": "1",` to the .json to override the inherited setting. <!-- > Please provide a summary of the changes made in this PR. Include details such as: > * What issue does this PR address or fix? > * What new features or enhancements does this PR introduce? > * Are there any breaking changes or dependencies that need to be considered? --> Fixes #6066 # Screenshots/Recordings/Graphs N/A ## Tests Updated this flag in a custom user config for the printer than tried generating the code file with Air Filtration enabled and set to 70% The appropriate `M106 P3 S178 ` appears in the filament start gcode section of the file. <!-- > Please provide a summary of the changes made in this PR. Include details such as: > * What issue does this PR address or fix? > * What new features or enhancements does this PR introduce? > * Are there any breaking changes or dependencies that need to be considered? --> # Screenshots/Recordings/Graphs <!-- > Please attach relevant screenshots to showcase the UI changes. > Please attach images that can help explain the changes. --> ## Tests Updated this flag in a custom user config for the printer than tried generating the code file with Air Filtration enabled and set to 70% The appropriate `M106 P3 S178 ` appears in the filament start gcode section of the file.