Five-layer Carbon Activated Face Mask Filter

Place a face mask filter in your mask for improved protection This face mask filter fits in face masks that include a "pocket". This filter is five-layer, machine sewn, carbon activated and protects from gas, pollen, and dust while blocking odor. Filter measures 4 3/4-inch by 3 1/4-inch. Very limited supply of these. About carbon filters Activated carbon has special properties that allow it to remove volatile organic compounds, odors, and other pollutants from the air. It accomplishes this in a way that is different from other air purifiers. Carbon air filters trap gases on a bed of charcoal.