The 9928 is a premier welding respirator for protection against oil and water based mists, fine dusts, metal fume and ozone and is specifically designed to offer respiratory protection in welding operations. Efficient particle filter to resist clogging especially useful for extended use against welding fume. Activated carbon layer to filter out ozone generated by MIG, TIG and ARC welding operations. 3M Cool Flow valve to reduce heat build up inside the mask. Flame retardant specially treated outer shell. Low profile design for compatibility with welding shields. 4 point adjustable head straps. Soft sealing ring which ensures a totally comfortable, properly sealed fit. Approval EN 149:2001 FFP2. Nominal Protection Factor 12. Assigned Protection Factor 10. Supplied in packs of 10