There are lots of features in IQAir Air Purifiers series such as the purifier is ultra quiet so that it can be used inside the bed room or hall. Sound attenuating filters are used in the IQAir Air Purifier so that less sound is produced. IQAir HealthPro Air Purifier can filter the particles 100 times much smaller than the ordinary HEPA purifies. HealthPro Plus Air Purifier filtration efficiency is over 99.5%. It is tested that it can purifier can filter the particles of size 0.0003 microns and larger. The products come with five years of warranty and no other purifier companies can guarantee such working functionality of the purifier.