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Filters › Blueair Blue Signature (Small)
Blueair Blue Signature (Small) replacement filter
The Blueair Blue Signature (Small) takes the Blue Signature Small Replacement Filter. It costs $39.99 at Blueair's store and lasts up to 12 months, which works out to about $40 a year in filters.
The numbers
| Filter | Blue Signature Small Replacement Filter |
|---|---|
| Price at Blueair's store | $39.99 |
| Lasts | up to 12 months |
| Filters per year | $40 |
| Electricity per year (est.) | $12 |
| Total running cost per year (est.) | $52 |
| Five years of filters | $200, against $180 for the purifier |
Filter price and replacement schedule are Blueair's own, checked 2026-10-07. Yearly figures are our calculation from them; electricity assumes 24/7 use at a typical fan speed and $0.17/kWh.
How it compares
Its yearly filter cost ranks 2 of 23 purifiers we track (1 is cheapest). Against other purifiers for small rooms:
| Purifier | Filter | Per year |
|---|---|---|
| Blueair Blue Signature (Small) | $39.99 | $40 |
| Coway Airmega 150 | $49.99 | $50 |
| Levoit Core 200S-P | $25.99 | $52 |
| Blueair Blue Pure 511i Max | $38.99 | $52 |
| Levoit Core 300S-P | $29.99 | $60 |
| Levoit Vital 100S-P | $39.99 | $80 |
| Levoit Vital Pet Pro | $49.99 | $100 |
When to replace it
- Follow the purifier's filter indicator rather than the calendar: it tracks actual use, and the brand's schedule is a maximum under normal conditions.
- Wildfire smoke, heavy cooking, pets and dusty rooms shorten a filter's life. A filter that looks grey or carries a smell is due even if the light hasn't come on.
- Third-party filters are cheaper, but the brand's performance figures only apply with its own filter, and on some purifiers the filter-life tracking only works with genuine ones.
See the full specs for the Blueair Blue Signature (Small), the cheapest purifiers to run, or every purifier's filter cost.