Really quiet on sleep mode for night time.

Really like the auto mode: when in the low speed setting the fan noise is barely noticeable. Occasionally, the units will increase fan speed when they detect impurities in the air, when running full speed they sound similar to a bathroom exhaust fan, but only run at full speed for less than a minute before progressively reducing the speed to low. The sleep mode is good, which also turns off the indicator lights which are quite bright when the room is dark. I was hoping I could schedule the fan speed setting through the smart things app, but this isnt possible (only on/off can be scheduled). The units are fairly compact, the air intake is on the front only and the outlet is on the top, which made them easy to position for our needs. Happy with these air purifiers and would recommend them.

Noticeable improvement in air quality ... less sneezing and coughing. Very satisfied

Fantastic....

Just moved into a new house and it's kept the dust at bay. Young ones just started to feel the effects of hayfever whilst out and about, however at home she's fine with the device running.