HEGA is an acronym for "High Efficiency Gas Absorption". Originally developed by the British military as a defense against chemical warfare, HEGA is a carbon cloth filter. Chemical warfare involves using the toxic properties of Chemical substances to kill injure or incapacitate an enemy. Carbon (kɑɹbən is a Chemical element with the symbol C and its Atomic number is 6 This carbon cloth proved to be many times more efficient than the granular activated carbon form at adsorption of gaseous pollutants. Activated carbon, also called activated charcoal or activated coal, is a form of Carbon that has been processed to make it extremely porous and thus to Adsorption is a process that occurs when a gas or liquid Solute accumulates on the surface of a solid or a liquid (adsorbent forming a film of molecules or atoms (the With its light weight and easy workability, HEGA filters are now used in some residential air purifiers. An air purifier is a device which removes Contaminants from air