Protect your home, business, or vehicle from daily pollution or terrorist attack with the Castellex Air350 Mark II nuclear, biological, and chemical (NBC) filter ventilation system. Operating a three-stage filtration process for optimal (99.99% efficiency) cleaning, this NBC system is designed to provide 150 m3/h of fresh air to a maximum of 24 people in a panic room or enclosed space. The system positively pressurises the air in the space to prevent pollution entering through tiny cracks or gaps, and operates at a low 71 dBA noise level (approximately that of normal conversation) at 50 Hz.

The NBC air filtration system’s triple failsafe design means it will continue to operate even if both mains power and the backup battery fail, thanks to the manual power backup system. Power consumption is up to 130 W, operating from the supplied 110/240 V AC power cord, backup battery, or power unit. Should the main system itself become compromised, a backup system will kick in.

The system is fitted with a USB charger for communication devices. Stay connected to the outside world while you wait for help or for the panic event to come to a safe conclusion.

The Castellex Air 350 Mark II life support system incorporates a blast valve designed to manage room pressure in the event of explosions or sudden concussive occurrences (for example aftershocks or building collapse). The valve protects your bunker, fallout shelter, or survival unit to a high 123 psi.

The system removes chemical, biological, and nuclear elements from the air to be stored in a hermetically-sealed filter until they can be safely dealt with.

Fit your Castellex Air 350 MArk II NBC system in safe rooms, panic rooms, shelters, or enclosed spaces in domestic premises to protect your family from terrorist attack, wartime events, or natural disasters. Install in commercial and business premises to offer a place of refuge to employees, or to protect them from rising levels of pollution in urban and suburban environments. Fit in mobile real estate such as a yacht, van, or work vehicle deployed in heavily-polluted or dangerous areas.

Supplied with the unit are three filters—pre, HEPA, and carbon—plus a blast valve, an overpressure valve, a blast valve fixing set, a backup battery, a USB charger, NBC pipe, a power cord, and a power unit. Additional filters may be bought. Optional extras include replacement batteries, a pressure indicator, an O2 indicator, and a wall fixing set.

Available in white. Constructed from high-quality components in the UK. Attractive modern design.

Collective filtration system intended for up to 24 * people in panic room
The system provide 150 m3/h of fresh air
High blast protection (123 PSI)
Power backup system for operating without mains
Manual power backup system if battery discharge or failure event
“Castellex Air350 MArk II protect you from most 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 flowup to 150 m3/h
Power consumptionup to 130W
Power supply110-240 VAC
Frequency50-60 Hz
Hepa filterH14
System efficiency99.99%
Noise level dBup to 71
Color designwhite

Castellex Air350 Mark II unit
Hepa filter
Carbon filter
Blast valve
Overpressure valve
Blast valve fixing set
Backup battery
USB charger
NBC pipe 3m
Power unit
Power cord

Castellex Air350 Mark II

The Castellex Air350 is a three-stage NBC air filtration system suitable for use in nuclear bunkers, survival shelters and strongrooms/ panic rooms as well as in domestic and commercial environments at high risk from pollution or attack. The unique filtering system, increased backup batteries power, manual hand-crank, allows usage of Air350 NBC air filtration unit for a long period of time. Be ready for SHTF.

Lead time 4-6 weeks.


£5,520.00 + VAT

In stock

Castellex Logo Just White
Castellex has vast experience in designing and manufacturing NBC (Nuclear Biological Chemical) Air Filtration/ Air supply stations for different applications. It’s widely used across the Globe by military, hospitals, private individuals. No nuclear bunker or survival shelter is completed without the state of the art Castellex NBC air filtration station.
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