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proki home :: safety equipment :: gas filters :: msa official niosh challenge chart
how to read this chart: the filters and masks are listed at the top, there is an 'x' in any column
with a niosh approval, an 'e' in any column where results exceed niosh standards but no application
for approval has been made, and the column is left blank if the system is untested, specifications have
not yet been determined, or rarely that the setup didn't meet niosh requirements.

msa is the world leader in safety equipment and military gas mask and filters