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AFU 50 — CBRN / NBC Air Filtration Unit

Aug 31
4 min read

AFU 50 is an advanced NBC/CBRN filter designed for integration into air filtration and ventilation systems used in safe rooms, civil defence shelters, bunkers, industrial facilities and other protected environments. It can also be integrated into other compatible filtration systems or used to replace an existing filter. Atmas Group


The AFU 50 is designed for a nominal airflow of 50 m³/h, making it a compact filtration unit for systems where a controlled and relatively low airflow is required. Atmas Group


What is CBRN filtration?

CBRN stands for Chemical, Biological, Radiological and Nuclear. CBRN filtration systems are designed to form part of an overall air-filtration and ventilation system for protected spaces.

According to the technical information published by Atmas Group, CBRN filters can incorporate different filtration stages for different types of airborne threats. These may include mechanical filtration for airborne particles and activated carbon for adsorption of certain gases and toxic industrial chemicals. Atmas Group

The exact protective performance of a particular filter should always be assessed against the manufacturer's technical documentation and the specific substances or particles concerned.


AFU 50 technical specifications

Specification

AFU 50

Nominal airflow

50 m³/h

Pressure drop at nominal airflow

320 Pa

Mechanical filter efficiency

≥99.995%

Filter weight

23.3 kg

These specifications are published for the AFU 50 by Atmas Group. Atmas Group


Nominal airflow: 50 m³/h

The AFU 50 has a nominal airflow of 50 cubic metres per hour.

This value describes the specified airflow through the filter at its nominal operating condition. The actual airflow delivered by a complete ventilation system will depend on the complete system configuration, including the blower, air ducts, valves and the pressure losses of other components.

Therefore, the 50 m³/h specification should be understood as the nominal airflow of the AFU 50, rather than the guaranteed airflow of an entire ventilation installation.


Pressure drop: 320 Pa

The specified pressure drop at nominal airflow is 320 Pa. Atmas Group

Pressure drop is an important parameter when selecting a compatible blower or ventilation system. The blower must be capable of maintaining the required airflow while overcoming the resistance created by the filter and the other components in the air path.

For engineering calculations, the pressure drop of the AFU 50 therefore needs to be considered together with the pressure losses of the complete installation.

Mechanical filter efficiency: ≥99.995%

The published mechanical filter efficiency of the AFU 50 is ≥99.995%. Atmas Group


This figure specifically describes the stated mechanical filtration efficiency. It should not be interpreted as a universal removal efficiency for every chemical, biological, radiological or nuclear contaminant.

CBRN filtration can involve different filtration mechanisms. Mechanical filtration addresses airborne particles, while other filtration stages may be used for gaseous contaminants. The appropriate performance therefore depends on the filter construction and the specific contaminant being considered. Atmas Group


Filter weight: 23.3 kg

The total published weight of the AFU 50 filter is 23.3 kg. Atmas Group

This specification should be considered when planning transportation, installation and mechanical support for the filtration system.


Integration into ventilation systems

The AFU 50 is intended to operate as a component of an air filtration and ventilation system, rather than as a complete ventilation system by itself. Atmas Group

A complete installation may require additional components such as:

  • an appropriate ventilation blower;

  • air-intake components;

  • valves;

  • ducting;

  • connections;

  • pressure-control components.

The selection of these components must be based on the required airflow, pressure conditions and configuration of the particular installation.


Applications

The AFU 50 is specified for use as part of filtration and ventilation systems installed in:

  • safe rooms;

  • civil defence shelters;

  • bunkers;

  • industrial facilities;

  • other protected facilities.

It can be used as a standard filter within compatible CBRN filtration systems and may also be integrated into other suitable systems or used to replace existing filters. Atmas Group


AFU 50 and ARC 50

The AFU 50 is also specified as a component of the ARC 50 CBRN filtration system. The ARC 50 has a filtration airflow of 50 m³/h and a ventilation airflow of 100 m³/h. Its published configuration includes an AFU 50 air-filter unit together with other system components. Atmas Group

The ARC 50 documentation specifies the AFU 50 with an airflow rate of 50 m³/h, a pressure drop of 320 Pa at nominal flow and a filter weight of 23.3 kg. Atmas Group


Conclusion

The AFU 50 CBRN/NBC filter is a compact air-filtration component specified for protected environments and CBRN filtration systems.

Its published key parameters are:

50 m³/h nominal airflow · 320 Pa pressure drop · ≥99.995% mechanical filtration efficiency · 23.3 kg filter weight. Atmas Group

For system design, these parameters should be evaluated together with the performance of the blower, ductwork, valves and other components of the complete ventilation installation.


 
 
 

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