Posted by a reviewer on Amazon

The system includes gas and particle sensors poorly labeled as smell and dust sensors with a primitive readout of 1 2 or 3 bars the display also includes a frowning face at 3 bars and a smiling face at 1 bari find this type of labeling annoying but have not allowed it to affect my rating

Posted by a reviewer on Amazon

The sensors permit an auto mode that adjusts the fan speed so that the room is kept clean

Posted by a reviewer on Amazon

I have not tried operating the purifier with the cheaper hepaonly filter which costs half as much as the smokestop filters and i wonder how well the auto mode will function when using a filter that only removes particles you need activated carbon to remove gas contaminants so the particle filters dont seem to have any way to remove the gas contaminants that the sensor detects

Posted by a reviewer on Amazon

Hepa filters can in principle remove 99

Posted by a reviewer on Amazon

The actual performance however depends strongly on the quality of the air purifier because if air leaks around the filter you wont get anywhere near 99

Posted by a reviewer on Amazon

I returned that and it was fixed with a replacement unit