Airfire AP309 user manual

 

✓ Confirmed fit — Airfire AP309 & AP409 air purifiers

  • Filter type: True HEPA H14 (medical-grade)
  • Design: two-stage system — a washable pre-filter plus a separate H14 HEPA element
  • Replace: every 3–5 months (about 2,500 hours)
Shop the AP309 / AP409 filter →

Not sure this is your model? The AP309 and AP409 open from a removable front panel that snaps off at the side gap. Inside you'll find a washable pre-filter sitting in front of a separate H14 HEPA element. If your unit matches this — panel snaps off, two-part filter — this is the right replacement.

When to replace your filter

  • Replace every 3–5 months, or roughly every 2,500 hours of use.
  • Your purifier's HEPA indicator light turns on (and keeps flashing) 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. Gently snap the front panel at the side gap to unlock it, then lift it off.
  2. Take the old filter out.
  3. Remove the plastic wrap from the new H14 filter. Running the purifier with the wrap still on blocks airflow and can cause it to overheat.
  4. Place the new filter in, then put the washable pre-filter back in front of it.
  5. Refit the front panel until it clicks into place. Plug back in, then hold the HEPA button for 5 seconds to reset the indicator.

Keep your filter working between changes

  • Vacuum the washable pre-filter about once a month.
  • Brush or vacuum the white side of the HEPA filter monthly to clear hair and dust.
  • Never wash the H14 HEPA element with water — it damages the filter material. (Only the pre-filter is washable.)
  • Keep humidity below 85% RH; moisture can cause the filter to grow mold.

AP309 / AP409 quick specs

Filter True HEPA H14 + washable pre-filter
Replacement Every 3–5 months (~2,500 h)
Power 100–240V, 50/60Hz, 36W
Noise 22–58 dB
Speeds & modes 4 speeds (Low / Medium / High / Pet), Auto, Quiet Sleep, Timer 2–8 h
Air quality light Blue 0–35 · Green 36–75 · Yellow 76–115 · Red 116+ (PM2.5)

Troubleshooting

  • Replace light still on after changing the filter? Hold the HEPA button for 5 seconds to reset it.
  • Reduced airflow or odor removal? Vacuum the pre-filter, make sure the back grille isn't blocked, or replace the filter if it's due.
  • Excessive noise? Place the unit on a flat, level surface.
  • Not feeling the effect? Check the filter is seated correctly, the intakes aren't blocked (keep 20 cm clear), and the room size suits the unit.