Airfire AP401 HEPA Air Purifier User Manual

✓ Confirmed fit — Airfire AP401 & AP402 air purifiers

  • Filter type: True HEPA H13
  • Design: one-piece filter + base (a single integrated unit — not a loose cylinder)
  • Replace: every 6–8 months (about 3,000 hours)
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Not sure this is your model? The AP401 and AP402 use a one-piece filter that twist-locks into the base. If your unit unlocks with a twist handle underneath and the filter and base come out as one piece, this is the right replacement.

When to replace your filter

  • Replace every 6–8 months, or roughly every 3,000 hours of use.
  • Your purifier's HEPA indicator light turns on when it's time.
  • Replace sooner if you notice weaker airflow, less odor removal, or you run it in heavy smoke or pollution.
  • After fitting a new filter, hold the HEPA button for 5 seconds to reset the indicator.

How to replace the filter

Safety first: unplug the power adapter before you start.

  1. Rotate the twist handle on the base counterclockwise to unlock.
  2. Lift out the old filter.
  3. Remove the plastic wrap from the new filter. Running the purifier with the wrap still on blocks airflow and can cause it to overheat.
  4. Place the new filter in and refit the base cover.
  5. Turn the filter buckle clockwise until it clicks into place. Plug back in, then reset the HEPA indicator.

Keep your filter working between changes

  • Vacuum the pre-filter about once a month.
  • Brush or vacuum the white side of the filter monthly to clear hair and dust.
  • Never wash the filter with water — it damages the HEPA material.

Quick specs

Filter True HEPA H13, one-piece
Replacement Every 6–8 months (~3,000 h)
Power 100–240V, 50/60Hz, 48W
Noise 22–53 dB
Coverage 2500 sq. ft.

Troubleshooting

  • Replace light still on after changing the filter? Hold the HEPA button for 5 seconds to reset.
  • Reduced airflow or odor removal? Vacuum the pre-filter, or replace the filter if it's due.
  • Not feeling the effect? Check the filter is seated and locked correctly, and that the intakes aren't blocked.

Full manual

Need the complete operating guide (controls, timer, remote, full safety notes)?

Download the full user manual (PDF) →