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This filter insert has been shown by a third-party testing facility to block up to 97% of 3-micron-sized non-viable particles and 0.1-micron-sized aerosolized particles Filters are disposable, single-use filters that you throw away after a day’s use. They are designed so you can start with a fresh filter every day. Dispose of filters properly after use. Remove filters prior to washing. NOT FDA APPROVED: Not Intended for Medical Use; Not Tested Against *************************************************************. ************************************************************* Filters designed for Honeywell Dual-Layer Face Covers. Power source type: Solar Powered