Activated carbon with magnesium dioxide and copper oxide impregnation.

Certified efficiency 99.97% for particles down to 0.1 microns such as dust, pollen, bacteria, virus, pet dander, mold spores and other airborne particles. SmokeStop™ removes gaseous pollutants such as tobacco smoke, carbon monoxide, ethylene oxide, ozone and VOCs (volatile organic compounds) including household paints and other chemicals. For use with the Blueair 203 air purifier.

Dimensions: 18"L x 14"W x 1.8"H; 4 lbs