F3 is the Premium and most versatile filter combining High-Flo Filter + Active Carbon Filter. Outer layer is capable of trapping particulates down to .1 microns. The inner layer is effective towards fumes and odors. 99.9% effective - promotes 40% better breathability than standard F1 filter.

Extra Large Size, 3 filters per pack.

HIGH FLOW FILTER + ACTIVE CARBON FILTER
FOR HIGH INTENSITY, DUST/SMOKE/FUMES/ODORS