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The Sundstrom SR 221 Pre-filter discs are specifically designed to catch larger, coarse particles, effectively extending the life of the main particulate filter by protecting it from premature clogging.
The discs are placed in the pre-filter holder and then snapped on to the particle filter or combined filter. The SR 221 should always be used with particle, gas and/or combined filters.
Compatible with SR 510 P3 R and SR 710 P3 R, and combined filters SR 299-2 ABEK1-Hg-P3 R and SR 599 A1BE2K1-Hg-P3 R.
These, in turn, are for use with the Sundström SR 500 Powered Respirator, SR 200 Full Face Mask Respirator, SR 100, SR 90-3 and Freeflow Half Mask Respirator.
