Introduction The AFU 36 NBC / CBRN filter is an advanced filtration component designed for use in air filtration and ventilation systems installed in safe rooms, residential shelters, bunkers, containers and other protected spaces. NBC / CBRN refers to nuclear, biological and chemical threats, with CBRN explicitly covering chemical, biological, radiological and nuclear hazards. The AFU 36 is designed to operate as part of a CBRN filtration system, providing a dedicated filtra