AFU CO2 4800L Carbon Dioxide Filter: Advanced CO₂ Removal for Shelter Ventilation Systems

Maintaining breathable air inside sealed shelters requires more than particle filtration. Even when airborne contaminants are removed, carbon dioxide (CO₂) produced through human respiration continues to accumulate. Without adequate CO₂ removal, air quality gradually deteriorates and can become hazardous for occupants.

The AFU CO2 4800L Carbon Dioxide Filter is designed specifically to absorb carbon dioxide from recirculated air in shelters, bunkers, safe rooms, and other enclosed protected spaces. According to the manufacturer, the filter is intended for use with the ARC CO2 4800L Scrubber, while also being compatible with other systems that meet the required airflow and pressure specifications. 

Why CO₂ Filtration Is Critical in Closed Shelters

In normal occupied environments, fresh outdoor air continuously dilutes carbon dioxide. Inside shelters operating in closed mode with little or no fresh-air supply, CO₂ concentration increases over time.

According to the manufacturer, carbon dioxide can become a silent hazard because symptoms often begin gradually with headaches or dizziness before progressing to unconsciousness after prolonged exposure. 

For this reason, dedicated CO₂ scrubbers are an essential part of long-duration shelter ventilation systems.

Purpose of the AFU CO2 4800L Filter

The AFU CO2 4800L filter is engineered to:

• remove carbon dioxide from recirculated air;

• support breathable air inside enclosed shelters;

• operate as a replaceable filter element within CO₂ scrubber systems;

• integrate into existing compatible ventilation installations. 

Main Technical Specifications

According to the official product documentation, the AFU CO2 4800L filter provides:

Specification	Value
CO₂ Absorption Capacity	4800 liters
Nominal Airflow	150 / 180 / 200 m³/h
Pressure Drop @ Nominal Airflow	350 / 420 / 500 Pa
Filter Weight	45 kg
Factory Storage Time (sealed package)	3 years

Metal Housing and Chemical Absorption Media

The filter housing is constructed from metal and is filled with soda lime, a chemical absorbent used for removing carbon dioxide from recirculated air.

Each filter is supplied hermetically sealed to maximize storage life. Once the seal is opened and the scrubber begins operating, the absorption process starts immediately. 

Easy Replacement and Long-Term Readiness

Shelter systems are expected to remain operational over long periods while allowing maintenance with minimal downtime.

The manufacturer specifies that:

• spare filters should remain sealed until required;

• used filters can be replaced within seconds;

• the filter is designed as a replaceable cartridge for rapid servicing. 

This simplifies logistics for emergency preparedness and long-term shelter operation.

Estimating CO₂ Filter Requirements

The manufacturer recommends estimating filter requirements using:

Number of occupants × CO₂ production per person × operating hours

Calculation estimation example(not recommendation):

• an average resting person produces approximately 20–30 liters of CO₂ per hour;

• room volume should also be considered to ensure sufficient air recirculation and avoid localized CO₂ accumulation. 

Typical Applications

The AFU CO2 4800L filter is suitable for installation in:

• Civil defence shelters

• Safe rooms

• Underground bunkers

• Emergency shelters

• Protective facilities

• Industrial protected spaces

• Security installations

• Other enclosed ventilation systems compatible with the required airflow and pressure characteristics. 

Integration with Shelter Ventilation Systems

The AFU CO2 4800L filter is intended to operate as part of a complete shelter air management system.

It can be integrated with:

• CO₂ scrubbers;

• NBC / CBRN air filtration units;

• shelter ventilation systems;

• recirculation blowers;

• protected air handling equipment. 

Engineering Advantages

The AFU CO2 4800L Carbon Dioxide Filter offers:

• 4800-liter CO₂ absorption capacity

• Replaceable filter design

• Metal housing construction

• Soda lime absorption media

• Hermetically sealed packaging

• Compatibility with ARC CO2 4800L Scrubber

• Compatibility with other suitable systems

• Rapid filter replacement

• Long storage capability before use. 

Conclusion

The AFU CO2 4800L Carbon Dioxide Filter provides an effective solution for maintaining breathable air inside sealed protective environments where fresh-air intake is unavailable or restricted.

With a CO₂ absorption capacity of 4800 liters, nominal airflow options of 150, 180, and 200 m³/h, a 45 kg replaceable filter assembly, and hermetically sealed storage, it is engineered to support long-duration shelter operation while integrating easily with compatible CO₂ scrubber systems.