Activated carbon filters remove odors, gases, and chemicals through adsorption, with a single pound of activated carbon containing 3,000 square meters of surface area. These filters excel at capturing VOCs, formaldehyde, and chlorine while offering minimal pressure drop of 0.05-0.15 inches of water column. Typical residential units process 400-1200 CFM at standard airflow rates.
Adsorption Capacity and Saturation
Activated carbon becomes saturated after 6-12 months of continuous use in average homes, though duration varies with indoor air quality. A single filter typically absorbs 5-15 grams of contaminants before replacement. Higher quality filters with 2-4 pound carbon beds provide extended service life and improved odor removal.
Selection and Integration
Activated carbon filters cost $150-$400 per unit and fit standard 5-inch or 16×25 filter slots. They work best combined with mechanical filters to remove particles before carbon absorption. Healthcare facilities and laboratories typically replace filters every 3-6 months, while residential applications may extend intervals to 12 months with adequate pre-filtration.