From the manufacturer
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Designed for medium rooms
Filters the air at a rate of approx. 5x an hour (or about every 12 minutes) in a 388 ft² room to effectively lower particle levels in your master bedroom, living room, or playroom.
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Performance you can trust
Independently evaluated for performance by the AHAM Verifide Program for room air cleaners with a Clean Air Delivery Rate (CADR) of 123 CFM smoke, 96 CFM pollen, and 107 CFM dust in 388 ft² rooms.
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Freely place almost anywhere with 360º air intake
Unlike some air purifiers with strict rules for placement, the Blue Pure 311 Auto uses a 360-degree air intake, meaning you can place it almost anywhere in the room without compromising performance.
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Fabric pre-filter
The fabric pre-filter offers the first layer of protection, catching larger particles from the air.
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HEPASilent technology
Electrostatic filtration works with the particle filter to remove 99.97% of airborne particles.
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Particle filter
The main particle filter removes airborne allergens, like pollen, dust, pet dander, germs, and more.
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Carbon layer
A layer of activated carbon traps light household odors from pets, cooking, and smoking.

LED Air Quality Indicator
Stay up to date on the status of your indoor air with the LED air quality indicator (AQI). Displays one of three colors to indicate good, moderate, or poor.
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Particle sensor
Equipped with a particle sensor to measure current concentration of fine particles (PM2.5) and report via the AQI display.
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Intuitive Auto Mode
Auto-increases fan speed when the particle sensor measures diminishing air quality conditions (when cooking, vacuuming, etc.) and returns to a lower speed once pollution dissipates.
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One-button control
Forget about adjusting settings and knobs – a single button controls it all and lets you know when it’s time to replace the filter.
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Hidden cord compartment
A velcro-panel in the fabric pre-filter holds the power cord, keeping it close to the body of the air purifier and out of sight.
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Low noise and energy consumption

Low noise level
Cleans the air with noise levels no louder than a whisper on low (23 dB) and with less noise than a normal conversation on high (53 dB).

Low energy consuption
ENERGY STAR rated for energy efficiency (3-35 W) – certified room air purifiers are 40% more energy-efficient than standard models.

![]() Blue Pure 411
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![]() Blue Pure 411+
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![]() Blue Pure 411 Auto
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![]() Blue Pure 311 Auto
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![]() Blue Pure 211+
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Room Size
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161 sq. ft. | 185 sq. ft. | 190 sq. ft. | 388 sq. ft. | 540 sq. ft. |
CADR – Smoke
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105 cfm | 119 cfm | 180 cfm | 425 cfm | 350 cfm |
Auto Mode
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✘ | ✘ | ✔ | ✔ | ✘ |
AQI
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✘ | ✘ | ✔ | ✔ | ✘ |
Included Pre-filters
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✔ | ✔ | ✔ | ✔ | ✔ |
Metal Filter Cage
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✘ | ✔ | ✘ | ✘ | ✔ |
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