3M 8835+ Premium Valved Respirator FFP3 (Box 5) Our Premium Series Respirators offer enhanced performance and comfort due to a number of additional advanced features. You will also see that they are marked R, meaning that these respirators can be used over more than one shift providing they have not become clogged and good hygiene practices are implemented. Provides respiratory protection against higher levels of fine dusts, mists, and metal fume.