SPT 2102-VOC Filter They can prompt headaches, vomiting, rashes, asthma attacks and some are suspected to cause cancer 2102-voc honeycomb filter has 8-1/2-ounce of modified activated carbon impregnated with 8-1/2-ounce of zeolite particles Effectively removes formaldehye, toluene and voc actory tested: VOC removal efficiency reaches 95-percent, under the following conditions: 1m3 test room; initial concentration: 1.9-2mg/m3; 4hrs testing