Ventilation & Extraction


Britannia provides the design and installation of ventilation and extraction systems, fully integrated with gas detection solutions such as oxygen depletion monitors and carbon dioxide detectors.


Ventilation requirements can vary depending on the application and may include low-level extraction, ducted systems, or fresh air supply to ensure safe operating conditions.


In environments where liquid nitrogen is used—typically in cryogenic storage—low-level ventilation is essential. As a dense gas, nitrogen settles at floor level. When liquid nitrogen vaporises, it expands at a ratio of approximately 700:1, displacing oxygen and creating a serious asphyxiation risk.


To maintain safety, ventilation systems must be designed to clear affected areas quickly and effectively. Britannia calculates the required ventilation rates based on room size, layout, and equipment, ensuring a tailored solution for each installation.


Our systems are engineered to operate intelligently—providing controlled extraction under normal conditions to prevent nuisance alarms, and automatically escalating to high-capacity extraction in the event of an alarm, delivering rapid air changes to restore safe oxygen levels.


Multiple Fan Speeds

Up to 3 fan speeds and triggers available.

Manual Fan Activation

Manual fan activation by key switch or emergency stop buttons.

Linked to Gas Monitoring Systems

Fans triggered via gas monitoring systems and escalate depending on values.

Automatic Activation

Fans automatically triggered by PIR sensors or door entry systems.

Bespoke Design and installations

Britannia can design, install, maintain and calibrate systems.

Robust Ducting

Steel ducting that can handle extremely cold gas such as LN2.

Fan Options

Wall mounted or inline fans used.

Site Survey Available

Site Survey to identify and calculate your specific requirements.

Britannia provides the design and installation of ventilation and extraction systems that can be automatically triggered by CO₂ detectors and oxygen depletion monitors, ensuring a fast and effective response to hazardous conditions.


These systems are designed to work seamlessly with gas detection equipment, activating ventilation as soon as unsafe levels are detected. This automatic response helps protect personnel, reduce risk, and maintain a safe working environment at all times.


In applications involving liquid nitrogen (LN₂), extraction must always be installed at low level for maximum safety. Nitrogen vapour is heavier than air and will naturally settle at floor level, creating a potential hazard if not properly managed.


Installing extraction at high level in these environments is unsafe, as it can remove air at breathing height while allowing nitrogen to accumulate below—creating a significant danger to personnel.


Britannia designs each system based on the specific room size, layout, and usage, ensuring the ventilation rate is sufficient to quickly remove hazardous gases and restore safe oxygen levels. Systems can be configured to operate at a lower extraction rate during normal conditions and automatically increase to high-capacity extraction during an alarm, delivering rapid air changes when they are needed most.


By combining intelligent control, reliable gas detection, and correctly positioned extraction, Britannia delivers a complete safety solution tailored to your application.


📞 Need Advice?


Get in touch today on 01642 508744 or email sales@britanniamonitoringsystems.com, and our team will be happy to assist.