Two types of gas phase capture and control are physical adsorption and absorption (also called chemisorption). Both are used for removing certain solvent vapors, odors, and low concentrations of gases and vapors in indoor air. Physical adsorption results from the electrostatic interaction between a molecule of gas or vapor and a surface. Solid adsorbents such as activated charcoal and several other materials such as silica gel, activated alumina, zeolites, porous clay minerals, and molecular sieves are useful as adsorbents due to their large internal surface area, stability, and low cost.
Following are the main characteristics of Gas phase filters
- Gas phase filters remove odors and non-particulate pollution such as cooking gas, gasses emitted from paint or building materials, and perfume.
- Gas phase filters do not remove allergens