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Capable of providing 500 m3/h of fresh air for 55 people, the Castellex Air 3500 nuclear, chemical, and biological (NBC) filtration system delivers superb protection and environmental control for panic rooms, military installations and citadels, nuclear fallout shelters, survival bunkers, and mobile real estate such as villas, luxury yachts or warships. Highly recommended for embassies, hotels, schools, government buildings, and other at-risk targets, its high 250 W power rating allows the system to operate reliably in large areas at an incredibly low noise level of 62dBA

As a positive pressure system, the Castellex Air 3500 develops higher air pressure in the panic room or bunker than is found outside it: thereby preventing tainted air from entering via any route other than the triple filtration system. The system also incorporates multiple failsafe including triple alternative power sources: a power unit, powerful backup battery, and power generator. Three double blast valves, each with the capability to provide air from different places, ensure this NBC filtration system has maximum 129 psi protection from concussions such as explosions, collapsing building material, and aftershocks. Two overpressure valves, capable of bleeding air from different locations, manage the system’s ability to maintain a steady pressure in the protected area.

The system’s three filters are capable of removing every known warfare gases, plus biological agents and nuclear material including radioactive iodine. Harmful particulate matter down to 0.3 microns (micrometers) is scrubbed from the air and held in a hermetic enclosure until it can be safely disposed of.

The Castellex Air 3500 LSSis a complete NBC filtration solution with the capability to support communications devices and control environmental temperatures. This underground bunker air filtration system boasts a cooling and heating (HVAC) unit as well as an O2 indicator and system status indicators. You will be able to monitor and control the ambient temperature, keep an eye on the breathability of the air in the room, and check the operability of the system itself.

Four USB ports are built into the system, enabling constant charging for communications devices such as smartphones. A mains socket may also be added to the unit as an optional extra, enhancing your support capacity by providing a power outlet in the event of mains shutdown.

Add-ons for the unit include extra HVAC units, a pressure indicator, an automatic power generator, and a selection of filters and filter packs.

Fit the Castellex Air 3500 life suportsystem in domestic, commercial, and military installations to protect family, employees, or personnel during nuclear, biological, and chemical attack. The system is also designed to provide immediate life support in your panic room or survival bunker in the aftermath of a natural or human-made catastrophe.

Available in bespoke designs. Constructed in the UK from high-quality, reliable materials.


Collective filtration system intended for up to 55 * people in panic room
Our Top Quality Model
The system provide 500 m3/h of fresh air
High blast protection (129 PSI)
Operated by electric power
Power backup system for operating without mains
Double Fail safe power backup
Double fail-safe design
Automatic power generator
Powerful battery pack
Ar providing from different place
Air bleeding at different places
O2 indication
Cooling and Heating (HVAC)
System status indication
USB chargers
“Castellex Air 3500 protect you from all known warfare gases and also Biological weapons/ contamination,
Radioactive contamination,
Radioactive Iodine and Iodine Organic Compounds,
Acidic gases,
Volatile Organic Compounds (VOC’s) and more”

Air flow up to 500 m3/h
Power consumption 250W
Power supply 240 VAC
Frequency 50 Hz
automatic emergency generator power 10 kW
Generator engine type disel engine
Hepa filter H14
Pre-filter F9
System efficiency 99.99%
Noise level dB A 62
Color design on request


Castellex Air 3500 unit
Hepa filter
Carbon filter
Power generator 2.6 kW
3 x Double blast valve (air providing from different place)
3 x Overpressure valve (air bleeding at different places)
2 x Blast valve fixing set
Powerful backup battery
4 x USB charger
Pressure indication
Sound insulation
NBC pipe 10m
Power unit
Power cord


Castellex Air 3500

Complete high-powered NBC filtration system with pre-installed filters and exceptional blast protection.

Designed for use in the most vulnerable or at-risk locations during the most extreme circumstances, the Castellex Air 3500 life support system (LSS) is fitted with three filters: a pre filter rated F9, an activated carbon filter, and a top-graded H14 HEPA filter.


£57,500.00 + VAT

Additional products

  • Automatic power generator

    £9,855.00 + VAT
  • CARBON filter 3000 series

    £1,107.00 + VAT
  • HVAC unit

    £1,299.00 + VAT
  • Adjustable overpessure valve 160

    £829.00 + VAT
  • Battery replacement L

    £986.00 + VAT
  • Power generator

    £1,455.00 + VAT
  • HEPA filter 3000 series

    £316.00 + VAT
  • Blast valve gasket set 160

    £148.00 + VAT
  • Mains socket

    £249.00 + VAT
  • NBC pipe set 160

    £568.00 + VAT
  • Filter pack 3000 series (pre filter, hepa and carbon filters)

    £1,853.00 + VAT
  • Pre-filter 3000 series

    £122.00 + VAT
  • O2 indicator

    £543.00 + VAT
  • Blast valve fixing set

    £98.00 + VAT
  • Overpressure valve 160

    £579.00 + VAT
  • Pressure indicator

    £420.00 + VAT
  • Blast valve 160

    £769.00 + VAT

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Castellex has been protecting private and commercial clients for more than 20 years. Our security consultants are used by high net worth individuals in 15 countries worldwide.
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