Dust escapes from around the filter area and blows back into the room.

Safety first: Remove the battery and dust cup.

• Reinstall filter correctly: Remove the filter and reinstall it according to the arrows or guides on the housing. Ensure it sits flat and locks into place.
• Verify filter type: Confirm you are using the correct Makita filter model specified in the manual. Incompatible filters may not seal properly.
• Inspect gasket: Check the rubber or foam gasket around the filter frame. Replace the filter if the gasket is torn, compressed, or missing.
• Clean mating surfaces: Wipe dust from the filter seat and dust cup rim to ensure a good seal.