VariSorb® XL SAAFCity delivery system consist of filter elements in high impact polystyrene (HIPS) cell sides for assembly in front or rear access standardized universal holding frames or side-access track systems to fit standard dimension filter sections in air handling units. VariSorb® XL SAAFCity comes factory-ready for installation. VariSorb XL SAAFCity filters are designed for combined particulate and gas-phase removal of medium and low concentrations of gas-phase contamination in urban fresh air and recirculation AHU systems. VariSorb XL SAAFCity is designed to remove gaseous contaminants from urban environment, both indoor (outgassing from carpets, paint, solvent and detergents) and outdoor sourced (industry and transport).