Blueair Blue Pure 511 Air Purifier: CADR, Noise, Coverage & Specs
Last verified: Aug 22, 2026
Aug 2026
Quick verdict
The Blueair Blue Pure 511 is best suited to compact rooms where high airflow and quiet minimum operation are priorities. Its 123 CFM smoke CADR supports about 191 sq ft at approximately 4.8 air changes per hour. Buyers should separately evaluate maximum-speed noise and Blueair’s HEPASilent filtration before deciding.
Best for
- Bedrooms and small rooms
- Low-noise minimum settings
Consider alternatives if
- You need a verified maximum-speed noise figure
Verified strengths
- 123 CFM smoke CADR (~191 sq ft at ~4.8 ACH)
- 24 dB published minimum noise
- HEPASilent filtration (as published)
Verified limitations or missing information
- Maximum-speed noise is not in our sources
Blueair Blue Pure 511 overview
The Blueair Blue Pure 511 is a compact-room air purifier with a smoke CADR of 123 CFM. Based on our CADR-based room-size method, it is suitable for approximately 191 sq ft. It includes HEPASilent filtration and 24 dB minimum noise.
- Smoke CADR
- 123 CFM
- Recommended room size
- 191 sq ft
- Claimed coverage
- 189 sq ft
- Minimum noise
- 24 dB
- Filter type
- HEPASilent
- Power
- 16 W
- Weight
- 4.2 lb
- Last verified
- Aug 22, 2026
Blueair Blue Pure 511 CADR and room size
Recommended room size is about 191 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 189 sq ft corresponds to about 4.9 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.
Validated coverage from documentation is 189 sq ft.
Blueair Blue Pure 511 noise level
Published minimum noise is 24 dB.
Maximum-speed noise is not in our sources.
Blueair Blue Pure 511 filtration
Published filter type: HEPASilent.
Blueair describes HEPASilent as a combination of mechanical and electrostatic filtration. We do not independently verify particle-removal efficiency.
Replacement interval: 6 months.
Blueair Blue Pure 511 smart features
Compact & space‑saving design, Simple one‑button control, Whisper‑quiet operation, Energy‑efficient (2‑16 W)
Blueair Blue Pure 511 specifications
- CADR (smoke)
- 123 CFM
- Recommended room size
- 191 sq ft
- Validated coverage
- 189 sq ft
- Manufacturer claimed coverage
- 189 sq ft
- Minimum noise
- 24 dB
- Filter type
- HEPASilent
- Filter replacement interval
- 6 months
- Power
- 16 W
- Weight
- 4.2 lb
About Blueair air purifiers
Blueair models in this catalog are compared by CADR, recommended room size, noise, and filter type.
Blueair Blue Pure 511 comparisons
Compared with the Blueair Blue Pure 411i Max, the Blueair Blue Pure 511 has 13% lower CADR.
What is the CADR of the Blueair Blue Pure 511?
Smoke CADR is 123 CFM.
What room size is the Blueair Blue Pure 511 suitable for?
About 191 sq ft at approximately 4.8 air changes per hour with an eight-foot ceiling.
How loud is the Blueair Blue Pure 511?
Minimum reported noise: 24 dB.
Does the Blueair Blue Pure 511 have Wi-Fi?
No published Wi-Fi or app control in our sources.
What filter does the Blueair Blue Pure 511 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