Honeywell BW RigRat User Manual page 42

BW RigRat User's Guide
2. Loosen the two Philips screws that secure the filter.
3. Lift the filter out of its docking area.
4. Dispose of the old filter properly.
5. Press a new filter into place.
6. Replace and tighten the two Philips screws. Do not overtighten.
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