The Beurer LR405RS Replacement Filter Set is designed for exclusive use with the Beurer LR405 Triple Filter Air Purifier. The Replacement Set includes a Pre Filter and Combination Filter, graded to HEPA Filter Class 13 with 99.95% performance and an Activated Carbon Filter. The Pre Filter captures domestic dust, hairs, small insects, the Activated Carbon Filter captures harmful gases, various odours, heavy metals & the HEPA Filter captures bacteria, viruses, mites & pollen. The Beurer LR405RS Replacement Filter Set has the capacity to detect super-fine dust with particle sizes of up to .02 μm. Filter life extends approximately 4,260 hours of use with a handy ‘Filter Change’ indicator light alerting required change time.