Blueair
Blueair Blue Signature Large — features, strengths and limitations
SP4i · Midnight · Tabletop design
Editorial review Reviewed 28 October 2026 How we assess products
The Blueair Blue Signature Large SP4i combines strong large-room cleaning with a side-table format. The top supports lightweight items up to 5kg; keep the air outlet clear. Declared smoke clean-air delivery is 765m³/h, with about 67m² coverage at 4.8 air changes an hour. Automatic sensing, clear feedback and app schedules make regular operation easy. Low settings are unobtrusive, but boost is loud. Allow a 40cm-square footprint plus intake clearance, and budget for costly main filters. The washable fabric can attract scratching pets, and Apple HomeKit and IFTTT are absent. Main particle/carbon replacement is normally around 9–12 months, depending on use; choose the Large filter rather than the Small or Medium versions. It suits a large room where the appliance will remain on show. Night mode, a control lock and tool-free filter changes make upkeep straightforward. Blueair lists 3.5–42W depending on speed.
Key facts
Use these figures as a starting point. If a specification is critical to your choice, confirm it on the retailer or manufacturer page before buying.
- Controls
- Automatic; buttons and Blueair app
- Filter
- Particle + carbon; washable fabric prefilter
- Capacity description
- 67m² at 4.8 air changes/h
Strengths
- Strong large-room particle cleaning
- Usable side-table top helps justify the floor space
- Quiet low settings for regular use
- Useful app, automatic response and filter-life tracking
Limitations
- Substantial footprint needs intake clearance
- Boost is loud
- Main filters are expensive
- Fabric can attract scratching pets
- No Apple HomeKit or IFTTT support
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Useful accessories
For this model
Blueair Blue Signature Large replacement filter 112973
Choose the Large Signature filter specifically; the Small and Medium sizes are different.
For Blueair Blue Signature Large. One replacement filter; check the exact model and follow its care instructions.
Amazon
£102.91
In stock
Price checked 28 October 2026 20:49 GMT