Why it matters
The Blueair Blue Pure 511 is a HEPA room unit air purifier that its maker rates for 189 sq ft.
At the usual 4.8 air changes an hour and an 8-foot ceiling, a 189-square-foot rating implies about 121 cubic feet of clean air a minute. In a 12-by-15-foot bedroom that would turn the air over roughly 5 times an hour.
Filtration: HEPASilent.
Price-wise it sat in the cheapest third of the 74 hepa room unit models we cover when we checked; the button shows today's price.
It qualifies for our lists Best Air Purifiers for Allergies, Best Air Purifiers for Apartments and Dorms, where it is ranked against every model that meets the same rule.
Its rated room size of 189 square feet is one of the smallest ratings we cover: 5 of the 152 purifiers with a stated figure come in lower, and the range runs from 62 square feet to 4,800 square feet.
Compared with the Blueair Blue Pure 411i+ Max: rated room size 189 sq ft here vs 259 sq ft.
The listing gives a weight of 4.2 lb.
Warranty, per the maker: 1 year.
Who it's for, and who should skip it
Good fit if
- Rooms up to about 189 sq ft
- Allergy season
Look elsewhere if
- Whole-home filtration on its own
- Removing gases without a substantial carbon stage
Pros and cons
Pros
- Rated for 189 sq ft
Cons
- Filters are an ongoing cost
- Size to the room at 4.8 air changes per hour
Limitations to weigh
- Specifications are the maker's or seller's own figures; check fit against your equipment's model number and the actual size.
Specifications
The bracket shows where each figure comes from.
| Price | $99.99 | Maker |
|---|---|---|
| Warranty | 1 years | Maker |
| Product weight | 4.2 lb | Maker |
| Room coverage | 189 sq ft | Maker |
| Filter type | HEPASilent | Maker |
Alternatives worth comparing
More air purifiers we cover
- PuroAir 240 HEPA Air Purifier $199.99
- Coway Airmega 250 $399
- Ameifu FXAP2W Air Purifier
- Airpura V400 VOC, Chemical, Smoke Compact Air Purifier (V400-Black) $629.98
- ULTTY SKJ-CR021 Air Purifier
All air purifiers, compared in one table · Every Blueair product we cover
Final verdict
A solid choice for rooms up to about 189 sq ft. Confirm the model it fits before ordering.
Where to buy
Each button opens this exact model. We may earn a commission on tracked links; it never changes what we publish. Disclosure