

- Extends life of SR-510 filters
- NIOSH-approved, compatible with all Sundstrom APR (half-mask and full-face) systems
- Add-on SR-510 HEPA cartridge to add 99.99%-effective dry particulate and water-based particulate filtration
The SR-221 pre-filter is a non-classified filter media designed to capture coarse and larger particles while extending the life of the particulate filter SR-510, which is used for SR-500 PAPR, SR-100 half-mask, SR-200 full-face mask. The pre-filter is placed in the pre-filter holder which attaches to the particulate filter.
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