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O2 Supply & Overpressure Systems

Oxygen Supply & Overpressure Maintenance Systems for Shelters, Safe Rooms and Chambers
Underground Shelter 2560pix

In shelters designed for operation in complete isolation from external environment (lock up mode) for longer periods of time air regeneration systems must be installed to maintain the safe levels of Carbon Dioxide (CO2) and Oxygen(O2), as well as keep the overpressure (positive pressure) inside the shelter (pressurised shelter) which prevents from contaminated air entering the shelter.
The oxygen supply systems and overpressure maintenance systems together with the carbon dioxide removal system must be installed to work all together to maintain the required conditions for safe stay of the people inside the shelter or a chamber.
Lock up mode is usually used in shelters, strategic facilities and industrial applications where there is a risk of fires, floods, technogenic disasters with release of high concentration of toxic industrial chemicals (TIC) and CBRN materials and other emergency situations with no possibility to supply external air.
The systems we offer combine two critical life support features. A Positive Pressure Maintenance System (PPMS) to keep toxic and hazardous gases out, and a supplemental oxygen delivery system to maintain the air quality. Optional the systems can equipped with Gas Monitoring systems to alert the occupants regarding different gas levels.

How is Oxygen Supplied to a Shelter

Supply of the oxygen in a sealed shelter or s chamber can be organized in two standard methods: compressed air and oxygen cylinders. 

The most common breathable air sources within a refuge chamber are:

  • Incoming, filtered and regulated compressed air from an external source;

  • Oxygen cylinders;

  • Oxygen candle (Chemical Reaction).

Using Oxygen Cylinders in Isolated Environment

When external air supply source is not available, the shelter must have an independent source of oxygen. One of the options is to have a medical grade compressed oxygen from cylinders.
The Oxygen can be supplied directly from the O2 cylinders into the shelter. Compressed oxygen is released from a cylinder into the shelter through a regulator that controls the flow rate. Flow is set as for required rate of occupant consumption.

Read the related Article - What equipment is required for CBRN shelter?


Our Offer

Automated Oxygen Delivery Systems (AODS) for Shelters

An Automated Oxygen Delivery System (AODS) allows correctly maintaining the oxygen levels in the shelter or a sealed chamber.

Once the system is activated, the AODS continuously measures the internal oxygen level and disperses metered amounts of oxygen from a compressed oxygen cylinder, to maintain oxygen levels between 18.5% and 23% inside the shelter. The system’s flow rate is limited to 15 Liters per minute, suitable for up to 30 people.

AirBANK Pressure System

AirBANK Pressure System offers a simple modular solution for creating and maintaining the positive pressure (overpressure) inside pressurized shelter for a specified duration of time.

AirBANK provides rapid pressurization, which is activated and maintained using the AirBANK Control via a simple HMI touch screen. The system is integrated with Aura-FX Gas Monitoring device which ensures the correct levels of components in the air. 

Overpressure Meter - Gauge

Overpressure meters / gauges are used to measure and present the relative positive pressure (overpressure) in the compartment.


The meters are devices for measuring and presenting the overpressure levels in the shelter or in different areas of the shelter. Overpressure gauges measuring the relative pressure between two areas and presenting the difference in pressure between them. This is required to ensure correct levels of overpressure, which helps to prevent the contaminated air from entering the shelter. 

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