The Blueair Classic 690i takes the Blueair Classic 500/600 series Particle filter set (3) (part 501PFK) as its filter; replace it every 6 months; Australian sellers list it from A$39.67 as of 5 October 2026. This fit is listed by sellers and not yet confirmed against the manufacturer's list.
Your air purifier
Blueair Classic 690i
Air purifier
Listed by sellers, not confirmed by Blueair — check your old filterListed by sellers, not yet confirmed by Blueair — check the code on your old filter
Not yours? ChangeSave it · remind me every 6 months
Takes the 501PFK filter
Classic 500/600 series Particle filter set (3) · replace every 6 months · check the code printed on your old filter before ordering.
Your air purifier
Air purifier
Listed by sellers, not confirmed by Blueair — check your old filterListed by sellers, not yet confirmed by Blueair — check the code on your old filter
Takes the 501PFK
Filter · every 6 months · check the code on your old filter.
Other Blueair air purifiers that take the 501PFK
GenuineGenuine Blueair
$99.99
Blueair Au · 22 OctLowest genuine · Blueair Au · checked 22 Oct
CompatibleCompatible option
$39.67 each
3-pack $119.01
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 · $39.67 each · 3-pack $119.01
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 2 sellers
AUD, before delivery. Each price shows when it was checked.
Compatible options
1 seller
Opens Amazon AU in a new tab. Their page is the source of truth for price, delivery and returns.
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 690i
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:
- 501 PFK
- Retail name:
- 501PFK
- Retail name:
- Classic 500 particle filter
- Retail name:
- Classic 600 particle filter
Sellers list any of these; they are the same part.
About your Blueair Classic 690i
Blueair air purifier, air purifier — Classic 600. Its filter is the Classic 500/600 series Particle filter set (3), part 501PFK, changed every 6 months.
Also in this air purifier: Blueair Classic 500/600 series DualProtection filter set (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 13 Blueair models
Common questions
- Which filter fits the Blueair Classic 690i?
- The Blueair Classic 690i takes the Blueair Classic 500/600 series Particle filter set (3) (part 501PFK). Compatible filters made to the same specification also fit.
- How often should I replace the filter in my Blueair Classic 690i?
- 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 501PFK in Australia?
- We track 2 Australian sellers for the 501PFK; the lowest listed price when we last checked was A$39.67 at Amazon AU. Prices are re-checked daily and dated on this page.
- How do I fit the 501PFK in a Blueair Classic 690i?
- 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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