Safety first: Remove the battery and wear respiratory protection when handling filters.

Verify filter type: Check that you are using the correct Hilti filter (e.g., fine dust or HEPA) for the application.
Inspect filter for damage: Look for holes, tears, or separated pleats. Replace damaged filters immediately.
Install pre-filter: If your model supports a pre-filter or fleece bag, use it to protect the main filter and improve performance.
Seal check: Ensure the filter frame seals tightly against its housing.

Vacuum leaves fine dust haze in the air; filtration seems poor

Possible Causes