CBRN (chemical, biological, radiological and nuclear) filtration systems are designed to supply breathable fresh and filtered from war and industrial chemicals, biological particles and radioactive dust air into the toxic free area of the shelter to create a safe environment for the inhabitants. Systems also create overpressure (positive differential pressure) in gastight compartments of the shelter what helps to prevent gases and other contamination entering the shelter from cracks and small openings.

CBRN filtration and ventilation units and components are important component of the collective protection solutions and air supply systems in in civil defence shelters, bunkers and various types of protected spaces in residential buildings, offices and private houses, military, government, municipal, industrial and critical infrastructure facilities, command and control centers, data centers, nuclear power plants, schools, hospitals common areas and more.