Blueair Blue Signature Small Air Purifier: CADR, Noise, Coverage & Specs
Last verified: Aug 22, 2026
Aug 2026
Quick verdict
The Blueair Blue Signature Small is best suited to compact rooms where high airflow and app control are priorities. Its 160 CFM smoke CADR supports about 248 sq ft at approximately 4.8 air changes per hour. Buyers should separately evaluate filter cost, maximum-speed noise, and Blueair’s HEPASilent filtration before deciding.
Best for
- Bedrooms and small rooms
- App or Wi-Fi control
Consider alternatives if
- You need a verified maximum-speed noise figure
- Filter replacement interval or cost is a deciding factor
Verified strengths
- 160 CFM smoke CADR (~248 sq ft at ~4.8 ACH)
- 50 dB published minimum noise
- HEPASilent filtration (as published)
- Wi-Fi or app control
Verified limitations or missing information
- Maximum-speed noise is not in our sources
- Filter replacement interval is not verified
Blueair Blue Signature Small overview
The Blueair Blue Signature Small is a compact-room air purifier with a smoke CADR of 160 CFM. Based on our CADR-based room-size method, it is suitable for approximately 248 sq ft. It includes HEPASilent filtration, 50 dB minimum noise, and Wi-Fi or app support.
- Smoke CADR
- 160 CFM
- Recommended room size
- 248 sq ft
- Claimed coverage
- 248 sq ft
- Minimum noise
- 50 dB
- Filter type
- HEPASilent
- Wi-Fi / app
- Yes
- Power
- 20 W
- Weight
- 5.64 lb
- Last verified
- Aug 22, 2026
Blueair Blue Signature Small CADR and room size
Recommended room size is about 248 sq ft (CADR × 1.55). That is approximately 4.8 air changes per hour in a room with an eight-foot ceiling. The manufacturer figure of 248 sq ft corresponds to about 4.8 air changes per hour at the same ceiling height and is shown separately. Our recommended room size uses approximately 4.8 air changes per hour with an eight-foot ceiling. Manufacturer coverage figures may use a lower air-change rate and are shown separately.
Blueair Blue Signature Small noise level
Published minimum noise is 50 dB.
Maximum-speed noise is not in our sources.
Blueair Blue Signature Small filtration
Published filter type: HEPASilent.
Blueair describes HEPASilent as a combination of mechanical and electrostatic filtration. We do not independently verify particle-removal efficiency.
Filter replacement interval is not verified in our sources.
Blueair Blue Signature Small smart features
7 stages of superior filtration, Smart VOC sensing, HEPASilent filtration technology captures 99.97% of tiny airborne pollutants
Blueair Blue Signature Small specifications
- CADR (smoke)
- 160 CFM
- Recommended room size
- 248 sq ft
- Validated coverage
- 248 sq ft
- Manufacturer claimed coverage
- 248 sq ft
- Minimum noise
- 50 dB
- Filter type
- HEPASilent
- Power
- 20 W
- Weight
- 5.64 lb
- Wi-Fi / app
- Yes
About Blueair air purifiers
Blueair models in this catalog are compared by CADR, recommended room size, noise, and filter type.
Blueair Blue Signature Small comparisons
Compared with the Blueair Blue Pure 511i Max, the Blueair Blue Signature Small has 8% lower CADR.
What is the CADR of the Blueair Blue Signature Small?
Smoke CADR is 160 CFM.
What room size is the Blueair Blue Signature Small suitable for?
About 248 sq ft at approximately 4.8 air changes per hour with an eight-foot ceiling.
How loud is the Blueair Blue Signature Small?
Minimum reported noise: 50 dB.
Does the Blueair Blue Signature Small have Wi-Fi?
Yes — app or Wi-Fi features are listed.
What filter does the Blueair Blue Signature Small use?
HEPASilent.
Methodology
Specifications are compiled from manufacturer documentation, product listings and other cited sources.
How we calculate recommended room size.
Sources
All air purifiers · Blueair air purifiers · Best air purifiers for allergies · Methodology