Airfire AP404 air purifier manual
Replacement Filter Guide — Discontinued Black Tower AP404
This guide applies to the large, black, floor-standing Airfire AP404. The purifier has been discontinued, but replacement filters remain available for existing owners.
- Filter: Cylindrical H13 HEPA replacement filter
- Recommended replacement: Every 6–8 months, depending on use and indoor air conditions
Check Your AP404 Version
Two different air purifiers use the AP404 model name. Check your purifier’s appearance against the product images before ordering. The model number alone is not enough to confirm compatibility.
This filter is not for the slim AP404 with WiFi and a display screen. Find the filter for the slim AP404 →
When to Replace Your Filter
The recommended replacement interval is 6–8 months. Actual replacement needs depend on daily use and indoor air conditions. Heavy use, pets, or smoke exposure may require earlier replacement.
Check for reduced airflow, persistent odors, or a filter replacement alert. Follow the instructions supplied with your specific purifier.
Before Replacing the Filter
- Turn off and unplug the purifier.
- Follow your purifier’s original manual to open the filter compartment and remove the old filter.
- Remove all plastic packaging from the new filter before installation.
- Install the filter and securely close the compartment as directed in the manual.
- If your model requires an indicator reset, follow its model-specific instructions.
Filter Care
- Do not wash the HEPA filter with water.
- Follow the original manual for any permitted pre-filter cleaning.
- Keep air inlets and outlets unobstructed.
Need Help?
If you are unsure which AP404 you own, email support@airfirestore.com with a photo of your purifier and its model label before ordering.