For best results, we recommend that consumers change the filter when it has reached the end of its life.
This mode effectively detects allergenic dust in the air and switches the device to a more powerful speed, delivering up to 40% more clean air during the night 11 - while keeping the sound level low.
Philips Air Purifiers capture and remove from the air 99.
Generally, the costlier models have the Best features which a company has to offer.