Blue Pure 511i Max HEPASilent smart air purifier quickly cleans 193 sqft in about 12.5min, 465 sqft in 30 minutes and upto 926 sqft in 1 hour on high. Independently evaluated for safety standards and third-party tested for performance as part of the AHAM Verifide Program for air cleaners, this air purifier has a Clean Air Delivery Rate (CADR) of 125 for fine smoke particles, dust and pollen.
Q: What type of filter does the air purifier use?
A: This air purifier uses an activated carbon filter.
Q: Is the air purifier compatible with a mobile app?
A: This air purifier is compatible with a mobile app.
Q: Does the air purifier have a timer?
A: This air purifier has a programmable timer.
Q: How long does it take to clean a 465 square foot room on high?
A: It takes 30 minutes for the Blue Pure 511i Max air purifier to clean a 465 square foot living space on the highest setting.
Q: What is the Clean Air Delivery Rate (CADR) for this air purifier?
A: This air purifier has a Clean Air Delivery Rate (CADR) of 125 cubic feet per minute.
Q: Can the air purifier be controlled with a voice assistant?
A: This air purifier has Google Assistant built-in.
Q: How often does the filter need to be changed?
A: Thank you for your question! Blue Pure Max air purifiers are equipped with RealTrack technology, which makes it easy to monitor filter usage and know when it’s time to order a replacement. For optimal performance and clean air, we generally recommend replacing the filter every 6–9 months.
Customers recognize the Blue Pure 511i Max air purifier for its quiet operation and noticeable impact on air quality, with users appreciating the visual indicator of air quality changes. Many are thrilled with its overall performance, ease of use, and compact design that fits well in various spaces. The filter's ability to handle smoke and the customizable fan speed are also valued features, with some users reporting allergy relief.
The vast majority of our reviews come from verified purchases. Reviews from customers may include My Best Buy members, employees, and Tech Insider Network members (as tagged). Select reviewers may receive discounted products, promotional considerations or entries into drawings for honest, helpful reviews.

Blue Pure 511i Max HEPASilent smart air purifier quickly cleans 193 sqft in about 12.5min, 465 sqft in 30 minutes and upto 926 sqft in 1 hour on high. Independently evaluated for safety standards and third-party tested for performance as part of the AHAM Verifide Program for air cleaners, this air purifier has a Clean Air Delivery Rate (CADR) of 125 for fine smoke particles, dust and pollen.

The Shark NeverChange Air Purifier MAX delivers all-day clean air with powerful, long-lasting HEPA filtration. Watch your air quality improve in real time and breathe easier as Shark's PureShield Anti-Allergen* filtration captures dust, pet dander, smoke, irritants, and more. Plus, with up to 5 years of long-lasting filtration,** you can save big on pricey filter replacements. *Allergen refers to non-living matter. ** vs. cost of replacing filters over a 5-year period on top 10 leading competitor units under $150. Source: Based on market share data as of Nov. ‘23 to Oct ‘24.

Let’s clear the air with Blueair. Blue Pure 311i Max HEPASilent smart air purifier quickly cleans 387 sq. ft medium room in about 12.5 min, up to 929 sq. ft medium space in 30 min, and 1,800 sq.ft in 1 hour on high. This air purifier has a Clean Air Delivery Rate (CADR) of 250 for fine smoke particles, dust and pollen. Energy Star Most Efficient 2023.

Dyson Purifier Cool PC1 delivers whole-room purification⁴ and powerful cooling.⁶ The fully sealed filter system captures 99.97% of microscopic allergens² and pollutants as small as 0.3 microns.¹ The whole purifier, not just the filtration system, is fully sealed to HEPA H13 grade.³ Air Multiplier technology projects over 76 gallons per second of smooth, yet powerful airflow.⁷ Connects to the MyDyson app to control and monitor air quality from anywhere, or hands-free with compatible voice services.⁵ Recommended for rooms upto 7101 Sq Ft.
| Pros for Blueair - Blue Pure 511i Max 926 sq ft HEPASilent Small Room Bedroom Air Purifier - White/Gray | |||
|---|---|---|---|
| Noise Level, Air Quality, Overall Performance, Ease of Use, Filter | Air Quality, Noise Level, Overall Performance, Filter Life, Odor Removal | Noise Level, Air Quality, Overall Performance, Design, Ease of use | There were no pros for this product— |
| Cons for Blueair - Blue Pure 511i Max 926 sq ft HEPASilent Small Room Bedroom Air Purifier - White/Gray | |||
| Odor Removal | Size, Fan Speed | WiFi Connectivity | There were no cons for this product— |