Protects particle filter against early clogging of particles.
 
 
Pre-filter SR 221 is a disc that is meant to catch coarse particles and by that extend the lifetime of the particle filters SR 510 P3 R and SR 710 P3 R, combined filter SR 299-2 ABEK1-Hg-P3 R and SR 599 A1BE2K1-Hg-P3 R. The pre-filter is placed in the prefilter holder and then snapped on to the particle filter or combined filter.
 
The Alpha S has been specifically designed to ensure an excellent fit for the smaller face.
 
The unique inner face seal helps maintain a close and snug fit around the chin area which is generally regarded by experienced fit testers to be the main weakness on standard design disposable respirators.
Working closely with the fit2fit accreditation scheme and numerous users, Alpha Solway has developed a simple solution to an industry wide problem.
 
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