Brother GTX600SB Instruction Manual page 204

(5) Hold the grip and remove the mist fan filter.
(6) Insert a new mist fan filter and push in and close the mist fan door.
<CAUTION>

Insert the mist fan filter completely, on the side with the grip facing upward.
(7) Replace the other one in the same way.
Press by following the on-screen instructions to finish the work.
(8)
<NOTE>

Dispose of any waste resulting from the replacement in accordance with applicable laws and ordinances.
Precautions to keep good printing quality/use printer over the long term
Mist fan filter
Mist fan filter
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