The Sonicare brush head replacement subscription is all about bringing convenience to your healthy smile. Philips air purifiers have higher Clean Air Delivery Rate and energy efficiency with a NanoProtect HEPA filter than with a HEPA H13 filter, tested to GB/T 18801 From the air that passes through the filter, tested with NaCl aerosol by iUTA according to DIN71460-1

Microbial Reduction Rate: Test conducted at Airmid Healthgroup Ltd. Tested in a 28.5-m3 test chamber contaminated with airborne influenza A(H1N1).From the air that passes through the filter, it is a theoretical time for one-time cleaning calculated by dividing its CADR 520m3/h by the room size of 48m3 (assuming the room is 20m2 in floor area and 2.4m in height).

CADR is tested by a certified third party lab, according GV/T18801-2015. Following improvements in our testing method and production quality control, we upgraded the CADR values of our products.Based on CADR measurements according to GB/T-18801/2015 with device operating in Sleep mode and Allergy Sleep mode. If you buy a product where this info is not updated on the box yet, rest assured that the product performs at the higher specification mentioned online Microbial Reduction Rate Test at external lab, in a test chamber contaminated with avian coronavirus (IBV) aerosols, with Philips HEPA NanoProtect filter.