Pre-filter for Sundstrom PAPR & APR Systems

Sold in a pack of 10. 

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.