The presentation of Vzduchotechnik products for Bulgarian market

will start at 14:30 at he conference hall of Hall 7 (2nd floor) on Thursday 4th June 2026

Vzduchotechnik CBRN filtration at HEMUS 2026 (Plovdiv, BG)

Effective deterrence relies on surviving the first harsh hours and days of an attack, followed by active defense and recovery.

Crucial for this is a functional network of gas-tight underground shelters, the heart of each being a robust CBRN filtration system.

“Vzduchotechnik” is a Czech manufacturer  with over 60 years of experience in this field and was the primary supplier of CBRN filtration units for military and civil defense nuclear shelters in all Warsaw Pact countries. Nearly all Bulgarian bunkers from the 1970s and 1980s are equipped with these characteristic filters. We have returned to renovate and modernize them in the most effective and economic way possible. Our filters contain modern, cutting-edge technology while remaining fully compatible with the original construction. We use the newest AEP-54 certified activated charcoal and ensure the highest level of blast wave resistance on the market.

Ефективната защита в укритие зависи от способността да се осигури безопасност и автономност през първите критични часове и дни на една кризисна ситуация, като основа за последваща реакция и възстановяване.
Ключова роля за това има надеждната мрежа от херметизирани подземни защитни съоръжения, в чиято основа стоят високоефективните CBRN системи за филтрация на въздуха.
VZDUCHOTECHNIK е чешки производител с над 60 години опит в тази сфера и основен доставчик на CBRN филтрационни системи за военни и граждански защитни и ядрени укрития в страните от Централна и Източна Европа.
Голяма част от българските убежища и бункери, изградени през 70-те и 80-те години, използват именно тези CBRN системи.
Днес VZDUCHOTECHNIK продължава тази инженерна традиция, като предлага модернизация и обновяване на съществуващите системи чрез съвременни технологии, като същевременно запазва пълна съвместимост със оригиналната инфраструктура и системи. CBRN филтрите използват най-ново поколение активен въглен, сертифициран по AEP-54, а противовзривните ни клапани осигуряват най-високото ниво на защита срещу ударна вълна, на пазара.

For large-capacity shelters

CBRN filtering systems are vital in protecting against various harmful air-borne contaminants, such as gases, vapours and aerosols, which are released during a critical event. Such an event can occur for many reasons, starting from a natural disaster or accident, but also as a result of a man-made attack, such as terror, war or sabotage in a dangerous facility (such as a nuclear power plant).

Firbach X

Our filter-ventilation systems can stop contaminants from a wide range of sources, whether they are biological weapons, such as viruses that are distributed in the form of particles or droplets, chemical weapons, typically in the form of gases or nuclear fallout in the form of particles and radioactive gases and eliminate toxic industrial chemicals in the form of gases.

When designing a stationary large-capacity filter-ventilation system, many elements need to be considered, such as threat analysis (which contaminants and quantities), sufficient air flow (both to maintain an overpressure in the protected area that prevents contaminants from penetrating into area and to allow sufficient fresh air for residents) in both filtration and ventilation modes, power supply and backup, the number of those protected and their planned duration of stay, the size of the enclosure and many others.

The filtration system includes in particular the following components: a coarse pre-filter (for dust and small particle removal), fine filters (for finer particle pollutants), CBRN filters, an electric motor, gas-tight pipes, gas-tight shut-off valves, gauges and measuring equipment. All these components are designed to work together to provide a safe and reliable environment in emergency situations.

Applicable for:

  • Civil defense and military shelters
  • Large-capacity residential and commercial complexes
  • Critical infrastructure and strategic assets
  • Oil & gas, chemical and other types of hazardous industries
  • Nuclear power plants

Main characteristics of the Firbach X system

  • The stationary system allows constant readiness against CBRN-threats
  • The unit contains a ventilator with an electric motor and a crank for manual drive, in case of power failure
  • The unit can be adapted for air purification defined by a specific situation, with the maximum filtered air volume of one filter set shown on the image being 1800 m³/h
  • Our company also has CBRN filters that can filter up to 9000 m³/h of air in one set, it is possible to deliver multiple sets
  • The system can be fully automated and customized according to the specific environment upon request
Firbach 100
Firbach 300
FV 400

Firbach 100

Main characteristics of Firbach 100

  • compact unit designed to protect up to 20 people
  • system robustness and safety
  •  simple operation
  •  device is equipped with a special functionalized nanofiber filter next to the CBRN filter, which captures and eliminates any bacteria and viruses

Intended for:

  • private clients interested in their own increased protection – owners of houses, apartment buildings and villas
Product sheet

Firbach 300

Main characteristics of Firbach 300

  • unit designed to protect up to 60 people
  • system robustness and safety
  •  simple operation
  • possibility of manual control in case of power failure
  • the device is equipped, in addition to the CBRN filter, with a special functionalized nanofiber filter that captures and eliminates bacteria and viruses.

Intended for:

  • the protection of ship crews and medium-sized underground shelters
Product sheet

FV 400

We try to meet the wishes of our clients and this variant was created on their own initiative. It is an air-filter-ventilation system, which does not contain a CBRN filter and is thus designed primarily as protection against explosions and pressure waves. The system contains a unique nanofiber bactericidal and virucidal filter NANOPASARAN™ at the output, which protects people in the shelter against biological threats. At the same time, it protects against the
spread of diseases during air circulation in the shelter.

Main characteristics FV 400

  •  unit is designed to protect a maximum of 120 people
  •  system robustness and safety
  •  simple control
  •  possibility of manual control in case of power failure
  •  possibility of measuring air flow, overpressure and CO₂ level in the shelter
  •  device is equipped with a special functionalized nanofiber filter membrane that captures and eliminates any bacteria and viruses

Intended for:

  •  For smaller and medium-sized civil defense shelters
Product sheet

Filter-ventilation components

Pressure cap with metal membrane

  • serves for capturing the pressure wave in pipe line
  • metal membrane serves for gas-tight system closure
  • can also be used to remove air e.g. from battery area
  • air-flow rate 400 m³/h or 1300 m³/h

Filter inserts FVS

  • serve for basic filtration of atmospheric air
  • filtration class G3
  • flow rate 1500 – 9000 m³/h

Gas-tight valves

  • are used for gas-tight pipe closure or for air quantity regulation during filter-ventilation
  •  the valve is controlled manually
  •  for pipes D 150 – 1000 mm

Coarse dust filter

  • for rough filtration of atmospheric air
  • contains a special filter membrane that is washable by a stream of water
  • flow rate of air up to 600 m³/h (by combining of filters, air-flow rate increases)

Fine dust filter PF 500

  • serves to capture fine dust and mechanical impurities
  • filtration class E10
  • air flow max. 500 m³/h
  • separation rate 85 %

COLPRO 150/200

Radial ventilator with electric motor

  • via crank handle it can be manually operated in case of power failure
  • manual drive – 300 m3/h
    engine drive – 600 m3/h
  • 2 000 Pa

Oxygen equipment

  • intended for oxygen replenishment during isolation, resp. regeneration in the shelter
  • amount of oxygen is projected according to the number of sheltered persons

Gas-tight pipes

  • Gas-tight pipes of various shapes and diameters (elbows, pipe crossings, pipe junctions…)

Piping with bayonet attachment – for connecting filters

Gas-tight connections

  • intended for gas-tight connection of pipes, filters, etc.
  • for pipe diameters D 100 – D 355 mm

Air flow meter

  • used to measure the amount of filtered air
  • for air capacities of 100 m³/h to 1000 m³/h

We also supply:

  •  interwall gas-tight closures D 125 – D 300 mm
  • pressure wall closures for max. air flow 6000 m³/h
  •  circular silencers for pipes D 125 – D 355 mm
  •  outlets for pipes
  • electrical and hot water heat exchangers for pipes
  • thermometers for pipes
  • CO₂ meters
  •  mounting, anchoring construction

What security situation do you need to address?

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