Triple Filter Air Purifier Replacement Set for exclusive use with the LR405. Replacement Set includes Pre Filter and Combination Filter (HEPA Filter Class 13 with 99.95% performance and Activated Carbon Filter. Pre Filter (captures domestic dust, hairs, small insects), Activated Carbon Filter (captures harmful gases, various odours, heavy metals, formaldehyde, benzene) & HEPA Filter (captures bacteria, viruses, mites & pollen). The Beurer LR405 replacement set has the capacity to detect super-fine dust with particle sizes of up to 2.5 µm. Filter life extends approximately 4,320 hours of use with 'Filter Change' indicator light alerting required change time.