3M™ Adflo™ A1 organic gas filter - to be used with the 3M™ Speedglas™ Adflo™ PAPR welding respirator system (Each)3M Adflo A1 organic gas filter (part number 837542) to be used with the 3M Speedglas Adflo PAPR welding respirator system. A1 gas filter protects you against organic gases while welding Provides A1 gas protection that stacks on to your 3M Adflo welding respirator A pre filter and particle filter must be used at all times Replace according to your workplace regulations Taste and smell should not be used as reliable indicators of when the filter should