Air Handling Unit Components and Features
Air Handling Units (AHUs) are integral to modern climate control systems, serving as essential tools for effective air management. They play a vital role in ensuring comfort, enhancing air quality, and optimizing energy efficiency by regulating airflow, temperature, and humidity levels.
This section provides a comprehensive overview of the components and features that make up the Air Handling Units (AHUs) we offer. Each element, from filters to fans and heat exchangers, is meticulously designed to work in harmony, contributing to the overall performance and reliability of the system. Explore the details below to understand how these components come together to deliver superior air handling solutions.

Framework
The cabinet frame is constructed using specially designed galvanized steel profiles and custom plastic brackets tailored to fit these profiles. The interior surfaces are fully sealed to minimize pressure loss and prevent the accumulation of contaminants within the air handling unit.


Panel
The body panels of the unit feature a double-layer design, with the inner surface constructed from PVC-coated or electrostatically painted galvanized sheets. For effective heat and sound insulation, the space between the layers is filled either with rock wool plates or injected with two-component polyurethane using specialized equipment.
The galvanized sheets are joined using innovative K-profiles, which not only secure the fixed body panels but also allow them to function as service doors when needed.
Service doors are equipped with hinges and handles, with 2 to 4 handles provided based on the unit’s height for convenient access.
For enhanced safety, the units include an emergency stop button and a safety switch that automatically halts operation when the maintenance lid is opened.

Sealing
Special gaskets are used at the seams where the framework connects to the body panels, ensuring an airtight seal. These gaskets effectively prevent air leakage and are designed to withstand pressure differences within the unit.


Fans
In ventilator and aspirator cells, different components are chosen based on the pressure loss within the ventilation system. For systems with low to medium pressure loss (100-700 Pa), we use backward-curved radial fans. These fans are statically and dynamically balanced, offering high efficiency, quiet operation, and double suction. The electric motors are IP 54 rated with F insulation class and operate at 380 V and 50 Hz. They are selected based on the fan shaft’s power requirements, with an added safety margin.
The radial fans and electric motors are mounted on the same chassis, with rubber or spring insulators placed on the carrier slides to prevent vibration from being transmitted to the cell. The fan cell outlet and radial fan are connected through a sealed, rubber-flanged flexible joint.

Air Dampers
The air dampers in the air handling units are constructed from specially designed self-sealing aluminum flaps, equipped with a concealed plastic gear mechanism and bearing components.
These dampers enable precise airflow control, ranging from 0 to 100%. They are engineered based on the airflow rate and unit dimensions to minimize air leakage at the edges. The dampers can be operated either manually or with a servo motor, depending on the selected configuration.


Heater and Cooler Exchangers
Heater and cooler exchangers can be constructed with either copper pipes and aluminum fins or steel pipes and steel fins, depending on their intended application and the type of fluid. After manufacturing, all exchangers undergo a pressurized hydrostatic test to ensure their reliability.
The exchangers are mounted on studs, providing easy access for maintenance. Cooler exchangers are equipped with stainless steel trays or specially designed PVC droplet catchers to manage condensing water effectively.
Electric heaters are made with steel pipes and steel fins, and they can be fitted with an optional safety thermostat for added protection.


Filters
Air handling units use various types of filters based on specific requirements, as outlined by EN ISO 16890 standards:
- Class (G3, G4) ISO Coarse Pre-Filters are designed to capture coarse dust particles. They are arranged in a V-formation to reduce air velocity across the filter.
- Class (M5, M6, F7, and F9) ISO ePM1-2.5-10 Synthetic Bag Filters are highly efficient and installed as cartridges, making them easy to install and remove.
The filter cartridges feature a specially designed galvanized sheet frame with rubber gaskets to ensure a tight seal. The filter cell structure is optimized to prevent air leakage and meets international standards for dimensions and airspeed. Each filter cell is equipped with a lid for easy replacement and cleaning. Optional differential pressure indicators are available to monitor filter clogging.

Heat Recovery unit
The diagonal flow heat recovery unit is constructed from aluminum plates. Its high heat transfer coefficient and large surface area allow for efficient heat exchange between incoming fresh air and outgoing exhaust air. The optimal solution for each system is determined by taking into account both summer and winter design temperatures, as well as operational factors.

Steam Humidifiers
Steam humidifiers are made up of the following components:
- Steam Distributor Fittings: Available in various sizes and quantities depending on the capacity, these fittings are installed in cabinets made from standard panels.
- Hard PVC Monitoring Glass: Used to visually monitor the operation of the humidifier.
- PVC and Stainless Steel Droplet Catchers: These components prevent water drift by capturing any droplets.

Silencers
Silencers are designed to absorb noise and reduce it to the desired level. They feature compartments made from a galvanized frame, filled with glass wool, and covered with glass fabric.
- Body: Made of flanged galvanized sheet or optional stainless steel.
- Chamber: Filled with glass wool and covered with glass fabric.
- Dimensions: Custom sizes are available to meet specific needs.
- Isolation: Rock wool insulation is available as an option.
- Reinforcement: Used in large duct cross-sections to provide added strength and minimize resonance.
- Material: Filled with Class A2 non-combustible material that meets DIN 1402 standards.