Filtered Ventilation in PANZER Protective Structures

Filtered ventilation is one of the key technical systems used in shelters and protective structures, responsible for ensuring controlled air exchange under hazardous conditions.

Its purpose is to maintain safe conditions for occupants inside the shelter while limiting the ingress of external contaminants.

The filtered ventilation systems used in PANZER solutions are designed as part of the overall protective system, including the structure, doors, and technical installations.

Filtered Ventilation System – Operating Principle and Modes

The filtered ventilation systems used in PANZER protective structures are designed as an integral part of the shelter’s ventilation system. Their purpose is to ensure controlled air exchange under various operating conditions while maintaining airtightness and protecting the installation against dynamic loads.

According to the technical documentation for Andair GF gas filters, the following ventilation operating modes are provided for protective structures:

*fresh air mode,
*filtration mode,
*air recirculation mode,
*emergency mode,
*maintenance mode【Andair GF Filters†L23-L28】.

Andair gas filters are designed for operation in filtration and emergency modes and are tested for specified nominal airflow rates while maintaining defined airflow resistance values【Andair GF Filters†L1-L16】.

System Selection Principles

Filtered ventilation is not a one-size-fits-all solution. The selection of a specific system – including filter type, capacity, valve configuration, and operating mode – is always determined during the design process based on:

*intended use of the structure,
*number of occupants,
*required occupancy duration,
*operational and regulatory requirements.

The filtered ventilation system must be considered as part of the overall protective system rather than as a standalone device.

The selection of the filtered ventilation system is always based on the intended use of the structure, the number of occupants, and the defined operating scenarios. It is not a universal solution – each system must be tailored to the specific application.

Protection Against Blast Waves and Shock

Andair gas filters are designed to meet resistance requirements relating to:

*ground shock,
*air-blast effects.

According to the technical documentation, the filters must withstand a load profile including:

peak overpressure psp ≥ 0.7 to ≤ 0.9 bar,
positive-phase overpressure impulse I⁺ ≥ 2.60 to ≤ 2.80 bar·ms,
positive-phase duration t⁺ ≤ 12 ms【Andair GF Filters†L40-L42】.
To protect the ventilation system, VA 40 / VA 75 / VA 150 blast valves are used. They form an integral part of the ventilation system and enable safe operation in both filtration mode and fresh air mode【VA 40, 75, 150 Technical Data†L25-L41】.

GF Gas Filter Capacity Range and Applications

Filtered ventilation systems can be configured with gas filters of different nominal capacities depending on the intended use of the structure and the number of occupants. According to the manufacturer’s technical data sheets, available variants include:

GF 40 – 40 m³/h
GF 75 – 75 m³/h
GF 150 – 150 m³/h
GF 300 – 300 m³/h
GF 600 – 600 m³/h【Andair GF Filters†L5-L19】

Gas filters can be installed both in new protective structures and in existing shelters undergoing modernization or adaptation【Andair GF Filters†L13-L21】.