Like the Aller Air 4000 and 5000, the 6000 offers superior air purification but with the extra power of 22 lbs of mass activated carbon filtration for effective air cleaning up to 1800 square feet. The Aller Air 6000 VOCARB has the same features as the 6000 EXEC with the addition of specially blended activated carbon for enhanced elimination of odors, chemicals and volatile organic compounds.