In a context of increasing geopolitical risks, industrial accidents and emerging threats to critical infrastructure, air protection systems are becoming increasingly important. In this context, TANGRA has become the exclusive representative of the British company Castellex Ltd.. Castellex is an established specialized manufacturer of NBC (Nuclear, Biological, Chemical) and CBRN (Chemical, Biological, Radiological, Nuclear) air filtration and supply systems designed for bunkers, shelters and protected facilities.
These ventilation systems provide protection against nuclear, biological and chemical threats by creating a safe indoor environment through multi-stage filtration and pressure control within the protected space. The solutions are used in a wide range of applications – from military and government facilities to hospitals, command centers, bunkers and protected infrastructure. They ensure a controlled and safe atmosphere in enclosed spaces by filtering radioactive particles, biological agents and toxic chemical gases.
The core of NBC and CBRN systems is multi-stage filtration, which combines several types of filters, including: Pre-filtration (F-class EN799), removes dust, aerosols and larger particles from the incoming air. HEPA filtration (Class H14) captures up to 99.99% of fine particles, including bacteria, viruses and radioactive dust. Activated carbon filtration absorbs toxic gases, chemical agents and volatile organic compounds (VOCs). This combination of filtration technologies enables the systems to protect against:
- radioactive dust
- chemical warfare agents
- biological threats
- industrial toxins
- fine particulate matter
Positive pressure – the key to a safe environment. One of the key features of Castellex systems is the creation of positive air pressure within the protected space. With this principle, the internal pressure is higher than the external pressure, preventing contaminated air from entering through joints, doors or micro-cracks. As a result, all incoming air must pass through the filtration system, ensuring a controlled and safe air environment.
Castellex product series offered by TANGRA:
- Compact NBC systems. The Castellex Air series includes several models designed for different sizes of protected spaces, including residential or school shelters. The series includes: Castellex Air350, Castellex Air550, Castellex Air550 Ultimate. These systems provide airflow capacities of up to 150 m³/h and include: NBC three-stage filtration module blast protection valve, overpressure valve, ducting and installation components. The systems can operate with: electric power supply, backup battery, manual operation in emergency situations (manual/electric fan).
- The CBRN systems include: air intake system
pre-filters, HEPA filter, activated carbon filter (blast valve),
overpressure valve, fan, control system. This configuration provides protection even under extreme conditions such as: nuclear accidents, chemical attacks, biological contamination, industrial toxic emissions.
Castellex systems are designed for a wide range of applications:
- Military and government facilities
- military bunkers
- command centers
- protected communication facilities
- Critical infrastructure
- power plants
- chemical plants
- nuclear facilities
- Civil protection
- fallout shelters
- panic rooms / secure safe rooms
- public shelters
- Mobile solutions
- containerized bases
- military vehicles
- mobile command centers
The systems can be integrated into stationary bunkers, containerized structures or mobile protection units.
In a world where emergency preparedness is becoming increasingly important, such systems are turning into a key element of the modern strategy for protecting people, infrastructure, and industrial processes.
Castellex supplies its solutions worldwide, including Europe, the Middle East, Israel, the United Arab Emirates, Saudi Arabia, the United States and Canada.
As of February, the systems are also available in Bulgaria through TANGRA – AV Ltd.
