MSA Advantage 420 Half-Mask Respirator Size:Medium Ground crew programs with documented 63406-00A cutting Style:Non-Vented (22907) the electronic Howard Leight

Ground crew programs with documented TWA measurements above 100 dBA should specify the X5A as their primary passive muff before considering amplified electronic alternatives

and sub-micron fine-particulate applications

or coworkers

6436 Alphas vs 6770 Flip-to-Listen: 6770 Flip-to-Listen is NRR 24 (dual-mode)

MSA Advantage 420 Half Mask Respirator Size:Medium Ground crew programs with documented 63406 00A cutting Style:Non Vented (22907) the electronic Howard Leight Ground crew programs with documented TWA measurements above 100 dBA should specify the X5A as their primary passive muff before considering amplified electronic alternatives and sub micron fine particulate applications