APU Series Air Pressurisation and Filtration Units

The APU Series air pressurization system maintains the environment at a defined positive pressure level through a configuration controlled by sensors and fans. The system incorporates differential pressure switches or ambient air pressure sensors to continuously monitor pressure conditions. Based on real time data, the control system adjusts electronically controlled fans to regulate airflow and stabilize the internal environment.

When pressure deviations occur, the system initiates an immediate response to restore target levels. This controlled operation minimizes the ingress of uncontrolled external air, dust and contaminants, thereby

The APU Series air filtration process reduces a wide range of contaminants, including dust, smoke, mist, vapor, fine particulates, certain bacterial contaminants and chemical gases. The system targets not only coarse dust but also much finer particles by using filter configurations tailored to specific operational requirements.

The filtration level starts at EU4 and can reach up to U17 when required. This range enables effective performance in environments with high particulate density as well as in applications that require more stringent air quality control. In addition, the system’s chemical filtration capability reduces the impact of corrosive and harmful substances on the environment.

The APU Series goes beyond basic air circulation and delivers air pressurization together with advanced filtration. Standard ventilation systems typically focus on air exchange and the circulation of fresh air.

The APU Series creates positive pressure, controls air quality through filtration, and protects against chemical and particulate contaminants. It supports demanding industrial environments with durable performance. It also offers fixed or variable speed fan control, operates across a wide temperature range, and adapts to project-specific requirements through the TMS approach, which sets it apart from standard systems.

The APU Series offers a wide airflow range from 50 m³/h to 6,400 m³/h. This range allows the system to adapt to different requirements, from small technical spaces to large industrial areas.

The series includes multiple capacity options such as APU50, APU100, APU200, APU400, APU1000, APU2000, APU4000 and APU6400. This variety enables precise airflow selection based on project needs. The system also allows performance adjustment through fixed or variable speed fan control, enabling operators to match output with specific usage scenarios. This approach maintains required air quality while keeping pressure balance under control.

The APU Series operates in demanding industrial environments and delivers reliable performance across a wide temperature range from -40°C to +95°C. It maintains stable operation in both extremely low and high temperature conditions.

The system performs effectively in environments with high dust levels, corrosive exposure and chemical presence. Its structural design and material selection resist abrasive environmental factors and support long term durability. As a result, it fits well across a broad range of industries and applications, including:

• Electronics manufacturing and assembly areas
• Automotive production facilities
• Chemical industry and process environments
• Textile manufacturing plants
• Mining sites
• Construction and heavy industry applications

For detailed industry information, you can review the applications and areas of use pages to explore real project examples.

When selecting an APU Series Air Pressurization and Filtration Unit, the following criteria should be evaluated together:

• Airflow: The required airflow must be accurately determined. With capacity options ranging from 50 m³/h to 6,400 m³/h, suitable models can be selected for different scales of application. Factors such as area size, number of occupants, equipment density and contaminant load play a decisive role in this process.
• Filter type and filtration level: In environments where dust and particulate matter dominate, appropriate particulate filters should be selected. In areas with chemical risks, chemical filtration features become essential. Carbon filters, used either in combination with or independently from chemical filters, can also address odor control. The filtration level can be configured from EU4 up to U17, depending on requirements.
• Application area and environmental conditions: Parameters such as temperature range, dust intensity, corrosive exposure and operational continuity must be taken into account. In demanding industrial environments, durability and appropriate material selection are critical considerations.

Accurate evaluation of these criteria directly impacts system performance and operational efficiency.

The APU Series supports energy efficiency through fixed or variable speed fan control. The system adjusts airflow according to demand, which helps prevent unnecessary energy consumption. Its electronically controlled fan structure responds to pressure and air quality requirements and delivers balanced operation.

From an operating cost perspective, accurate capacity selection, appropriate filter configuration and regular maintenance play a critical role. A properly configured system maintains consistent performance and helps protect equipment over time, which reduces indirect operational costs. In demanding environments, it also protects equipment and personnel, supporting operational continuity.

The installation of an APU Series Air Pressurization and Filtration Unit should be planned according to the requirements of the application area. The following steps and criteria should be taken into account during the installation process:

• Needs analysis: The space volume, contaminant load, required airflow and target pressure level should be defined.
• Capacity selection: An APU unit with the appropriate capacity should be selected based on the analysis, and the system layout should be planned accordingly.
• Airflow direction: Air inlet and outlet directions should be properly designed to ensure balanced air circulation. Airflow can be directed from outside into the environment or recirculated within the space and filtered.
• Sensor placement: Pressure sensors and control components should be positioned at locations that enable accurate measurement.
• Fan and control system settings: The fan control infrastructure should be configured in line with environmental requirements.
• Maintenance access: The unit should be positioned to allow easy access for maintenance and service.
• Environmental compatibility: Filter selection and structural durability should align with application conditions, especially in environments with chemical exposure or high dust levels.

Proper implementation of these steps directly impacts pressure stability and air quality performance.

Regular planning of maintenance and filter processes is essential to ensure efficient operation of the APU Series. The following key aspects should be considered:

• Filter inspection and replacement: Filters may experience performance degradation over time due to the accumulation of particulates and contaminants. Regular inspection, cleaning and replacement when necessary are required.
• Fans and mechanical components: The operating condition and performance of fans should be checked periodically.
• Sensor accuracy: Pressure sensors and control equipment should be reviewed at regular intervals to verify measurement accuracy.
• Airflow balance: Airflow within the system should be monitored and any imbalances should be identified.
• Housing and connection elements: The unit housing, connection points and overall structural integrity should be inspected.
• Maintenance frequency based on environmental conditions: Maintenance intervals should be increased in environments with high dust levels or chemical exposure.

Regular maintenance practices support system longevity and help maintain stable air quality performance.

Indoor air quality is optimized with the APU Series through proper capacity selection, appropriate filtration level and controlled pressure management. When the contaminant profile of the environment is accurately analyzed, a suitable combination of filters for particulate and chemical loads can be defined. This approach enables the reduction of harmful components in the air.

Positive pressure control provides a significant advantage in this process, as it limits the ingress of uncontrolled contaminated air from outside. In addition, variable fan control allows airflow to be balanced according to operational requirements. As a result, a cleaner, more controlled and safer indoor air quality level can be maintained.

The main issues that may occur in APU Series air filtration units and the corresponding solution approaches are outlined below:

• Filter clogging: Filters may accumulate particulates over time, leading to reduced performance. Regular inspection, cleaning and replacement when necessary are required.
• Insufficient airflow: If airflow does not reach the expected level, fan settings, duct configuration and the suitability of the selected capacity should be reassessed.
• Pressure imbalance: If fluctuations occur in ambient pressure, pressure sensors and differential pressure switches should be checked.
• Sensor related measurement errors: Sensor performance should be tested regularly and calibration should be carried out as required.
• Performance decline due to harsh environmental conditions: In environments with high levels of chemical or corrosive exposure, appropriate filter selection and material compatibility should be ensured.
• Incorrect filter or capacity selection: Selections that do not align with application requirements can directly affect performance. A project specific configuration should be defined.