Description 3M™ Adflo™ Organic Vapour & Acid Gas Filter to be used with the 3M™ Speedglas™ Adflo™ PAPR welding respirator system.   Prevents nuisance level Organic Vapour, Acid Gas and SO2 Stacks easily on to your Adflo powered air respirator A pre-filter and particle filter must be used at all times Replace according to regulations at your workplace Smell and taste are not reliable indicators of when you should change the filter.