OdorGuard® pleated filters feature Carbon Web® filter media and are UL Class 2 approved. The medium duty filters have an integrated pre-filter and are available with granular carbon loadings of 200 grams/sq ft in a 2 in. thickness and 100 grams/ sq ft in 1 in. thickness. The light duty filters are available with granular carbon loadings of 50 or 25 grams/ sq ft in 2 and 1 in. thicknesses, respectively.