3M P100 Filter suitable for either negative or positive pressure uses is uniquely designed to render versatility, comfort and long life. Filter is used in a variety of applications including welding, brazing, torch cutting, metal pouring, soldering and exposure to lead, asbestos, cadmium, arsenic and MDA for concentrations up to 10 times and 50 times the permissible exposure limit with half Facepieces and full Facepieces respectively. Filter with 99.97% of filter efficiency measures 3.4″ X 4 45″ X 2.3″.