NORTH® 719009N99 N99 REPLACEMENT FILTER FOR 7190, 2/PK ESPECIALLY DESIGNED FOR USE WITH WELDING HELMETS AND FACESHIELDS. MAKE SURE YOUR NORTH® LOW MAINTENANCE FACEMASKS ARE STILL DELIVERING FULL RESPIRATORY PROTECTION. LARGE FILTERS HELP REDUCE BREATHING RESISTANCE FOR COMFORTABLE WEAR. PROTECTS AGAINST CERTAIN CONCENTRATIONS OF FUMES AND PARTICULATES GENERATED DURING WELDING, SUCH AS ALUMINUM, ZINC, AND IRON AND FITS UNDER MOST WELDING HELMETS. PROVIDES A MINIMUM FILTER RESPIRATORY EFFICIENCY OF 99% IN NON-OIL AREAS. MANUFACTURED IN AN ISO 9001 REGISTERED FACILITY NIOSH APPROVED WHEN USED WITH NORTH® 7190N99 MAINTENANCE FREE PARTICULATE RESPIRATOR