The Blueair Classic 403 takes the Blueair Classic 400 series Particle filter (part 402PF) as its filter; replace it every 6 months; Australian sellers list it from A$70.99 as of 5 October 2026. Fitment confirmed against the manufacturer's compatibility list.
Your air purifier
Blueair Classic 403
Air purifier
Confirmed against Blueair's listConfirmed against Blueair Australia's compatibility list
Not yours? ChangeSave it · remind me every 6 months
Takes the 402PF filter
Classic 400 series Particle filter · replace every 6 months · check the code printed on your old filter before ordering.
Your air purifier
Air purifier
Confirmed against Blueair's listConfirmed against Blueair Australia's compatibility list
Takes the 402PF
Filter · every 6 months · check the code on your old filter.
Other Blueair air purifiers that take the 402PF
GenuineGenuine Blueair
$89.99
Blueair Au · 20 OctLowest genuine · Blueair Au · checked 20 Oct
CompatibleCompatible option
$70.99
Amazon AU · 5 OctAmazon AU · checked 5 Oct
Check sellerCheck seller details
Genuine: made by Blueair. Compatible: another brand. Check certification on the seller's page.Genuine is made by Blueair. Compatible is made by another brand. Check the seller's certification details before choosing.
Lowest compatibleLowest compatible price · $70.99
Amazon AU. Compare with genuine below. Some links earn us a commission. Some seller links earn us a commission, at no extra cost to you.
Compare 3 sellers
AUD, before delivery. Each price shows when it was checked.
Compatible options
1 seller
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How long it lasts
Usually every 6 months. The filter light is a reminder, not a water-quality sensor.
After replacing: Press and hold the button until the filter light goes out (about 5 seconds).
Flow slows and taste drops off as the filter fills up. Changing on time is the whole point.
Not due yet?
Get a nudge when your filter is due — it's every 6 months. One email two weeks before, no newsletter. Manage or stop it anytime.
How to change the filter in your Blueair Classic 403
Watch the guide or follow the steps.
- 1Switch the purifier off and unplug it.
- 2Grip the edges of the front grille and pull it straight off (it is held by magnets). On 400/500/600 units do the same at the back.
- 3Slide the old flat filter(s) out and slide the new ones in the same way round, pleats facing out.
- 4Push the grilles back on, plug in, and hold the button until the filter light goes out.
Every number this part goes by
- Retail name:
- 402 PF
- Retail name:
- 402PF
- Retail name:
- Classic 400 particle filter
- Retail name:
- F400PA
Sellers list any of these; they are the same part.
About your Blueair Classic 403
Blueair air purifier, air purifier — Classic 400. Its filter is the Classic 400 series Particle filter, part 402PF, changed every 6 months.
Also in this air purifier: Blueair Classic 400 series DualProtection filter (every 6 months).
Where the model number is: The model number is on the rating label on the bottom or back of the purifier; the old filter usually has its own code printed on the frame.
Fits these 8 Blueair models
Common questions
- Which filter fits the Blueair Classic 403?
- The Blueair Classic 403 takes the Blueair Classic 400 series Particle filter (part 402PF). Compatible filters made to the same specification also fit.
- How often should I replace the filter in my Blueair Classic 403?
- Every 6 months. Flow slows and performance drops off as the filter fills up, so it's worth doing on time.
- Where can I buy the 402PF in Australia?
- We track 3 Australian sellers for the 402PF; the lowest listed price when we last checked was A$70.99 at Amazon AU. Prices are re-checked daily and dated on this page.
- How do I fit the 402PF in a Blueair Classic 403?
- No tools, a few minutes: 4 steps, listed on this page with the replacement video where the maker has one.
- What happens if I don't change it?
- The fan works harder for less airflow, and the carbon layer stops taking smells out well before the filter looks dirty.
- How do I reset the filter light?
- Press and hold the button until the filter light goes out (about 5 seconds).
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