Blueair Pure 311i Max HEPA Air Purifier, 1858 sq. ft. Coverage, Smartphone App Control, Quiet, Energy Star Certified

A: It looks like a Heather grey.

A: Thank you for your interest in Blueair! The Blue Pure 311i Max comes in the pre-filter color, Stockholm Fog.

A: Thank you for your interest in Blueair! he Blue Pure 311i Max is Quiet Mark certified, making it one of the quietest and least intrusive air purifiers available. Quiet Mark testing labs replicate real-life environments (rather than controlled lab settings) to evaluate both sound levels and sound quality, ensuring that the pitch of the sound is pleasant and unobtrusive. The Blue Pure 311i Max operates at 23 dB(A) on the lowest setting and is never louder than 50 dB(A).

A: It is very quiet. When it’s on the auto setting, I cannot hear it at all. If I turn up the fan to level 2 or 3 then it is noticeable but just sounds like a small fan.

A: Thank you for reaching out! You can purchase a replacement filter for the Blue Pure 311i Max on the Blueair website here: https://www.blueair.com/products/f3max-replacement-pac-filter-for-311i-max-1

A: Thank you for your inquiry! The red light on your Blue Pure 311i Max indicates that the air quality in the room is polluted. In response, the purifier's fan may increase speed if set to auto mode to help clean the air more effectively. Despite this, the Blue Pure 311i Max is Quiet Mark Certified and designed for whisper-quiet operation — running at just 23 dB on low and up to 50 dB on high. If the red light stays on continuously, we recommend cleaning the sensor inlets located at the back of the unit. You can also reset the light indicator by pressing and holding the fan speed button for about 15 seconds, until all LEDs on the interface light up. Once the filter light turns off, release the button. For more information, visit our website here: https://www.blueair.com/blogs/blue-pure-max/how-do-i-reset-the-red-light-filter-light-indicator-on-my-blue-pure-max-air-purifier?_pos=7&_sid=fba24864c&_ss=r

A: Thank you for your interest in Blueair! Yes, you can use a humidifier and an air purifier at the same time. In fact, they can complement each other to deliver fresh, clean air.

A: Thank you for your interest in Blueair! Our Blue Pure Max air purifiers remove 99.97% of airborne particles down to 0.1 microns and are equipped with an activated carbon filter to help reduce gases and odors, including VOCs. However, please note that the device sensor measures only PM2.5 levels. If you have additional questions, please don’t hesitate to contact us here:https://www.blueair.com/pages/contact-us

A: Thank you for your interest in Blueair! Yes, we recommend replacing your filter every 6 months when used 24 hours a day for optimal performance.

A: Thank you for your interest in Blueair! If you choose not to connect your 311i Max to the app, you can turn off the WiFi by long pressing the Fan Speed button for 5 seconds and then releasing it. The WiFi LED will stop blinking, indicating that the WiFi function is turned off.

A: Thank you for your interest in Blueair! The Blue Pure 311i Max air purifier is designed to capture 99.97% of airborne particles, including common PM1, PM2.5, and PM10 particles. While the 311i Max display is not equipped to show PM1, PM2.5, and PM10 particle levels, it is effective at cleaning the air. If you have any further questions or need more clarification, feel free to reach out!

A: Thanks for your interest in Blueair. The 311i Max and 311i+ Max differ in size, affecting the Clean Air Delivery rate based on your room size. The 311i Max quickly cleans 387 ft² in 12.5 minutes, 929 ft² in 30 minutes, & 1,800 ft² in 1 hour, while the 311i+ Max cleans 465 ft² in 12.5 minutes, 1,000 ft² in 30 minutes, & 2,000 ft² in 1 hour.