# Air Purifier Making a Rattling Noise: Causes and Fixes _Last updated: 2026-09-26_ ## Short answer A new rattle is almost always mechanical and simple: a filter that is not seated, shipping foam or tape left inside, a foreign object near the fan, or the unit vibrating on an uneven surface. Check those before assuming a worn bearing. ## Why it happens - The filter is not fully seated, or its plastic wrap was not removed. - Shipping foam, tape or a desiccant pack is still inside the housing. - Hair, paper or a small object is touching the fan blade. - The unit sits on an uneven or resonant surface, or a foot is loose. - A housing screw or the outlet grille has worked loose. - The fan bearing is worn (needs service). ## Check these in order 1. Unplug the unit. Open the filter cover, reseat the filter and confirm the wrap is removed. 2. Look for shipping foam, tape or packing material and remove it. 3. Inspect the intake and outlet for debris; remove it with a vacuum, not your fingers. 4. Set the unit on a level, hard surface and check that all feet are tight. 5. Tighten any visibly loose screws or the grille. 6. If the manual allows, run the unit briefly without the filter to isolate the noise; do not run it unprotected for long. 7. If the rattle continues with no filter, no debris and a level surface, contact the manufacturer. ## When it is not a quick fix A persistent grinding or scraping sound, a burning smell, or vibration you can feel through the floor points to the motor or fan assembly. Unplug it and contact the manufacturer; do not open a sealed housing. ## Sources Manufacturer user manual for filter installation and safety; general appliance guidance on vibration and surface leveling. ## Frequently asked questions **Q: Is a soft hum normal?** A: Yes. A steady, low hum from the fan and motor is normal. A rattle, buzz, click or scrape is not. **Q: Can I run the purifier without the filter?** A: Only for a brief diagnostic test if the manual permits it. Running without a filter lets dust reach the fan and is not for normal use. **Q: Does a dirty filter cause a rattle?** A: A clogged filter causes whistling or reduced airflow more than a rattle. Reseat it anyway, since a loose filter is a common source of noise. --- Canonical: