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Air Handling Unit for surgical rooms, hospital facilities and clean rooms

  • For the treatment of full fresh air or with partial recirculation.
  • Available static pressure selectable from 250 to 1,000 Pa depending on the type of plant and the need to install absolute filters after the unit.
  • Section for air suction from the rooms, partial recycle or total exhaust to the outside.
  • Static or dynamic management of overpressure or depression in the controlled room compared to a reference environment.

The units are equipped with controls, electrical panel, microprocessor and dedicated software. They can be expressly customized for:

  • General surgery rooms
  • Orthopaedic surgery rooms
  • Very low-temperature heart surgery rooms
  • Intensive care units
  • Sterilization rooms
  • Diagnostic imaging rooms
  • BSL laboratories for the treatment of viruses or substances which are toxic, radioactive, nuclear, flammable or contaminating in general
  • Hospital wards
  • Dental surgeries
  • Biotechnology laboratories
  • Anatomical pathology laboratories
  • Mortuary chambers.

The standard version of the new “H” Series air conditioners configured with the accessories conform to the German Standard DIN 1946 part 4. They are certified to be in compliance by TUV.

They are designed for surgical rooms, hospital facilities and clean rooms with a low static pressure of approximately 250-300 Pa on both the supply and suction fans. High performance fans can be provided as accessories: up to 1,000 Pa, with epoxy painting of the fins in order to satisfy even the most critical applications.

In practice, the entry level unit (which is in any case dimensioned to treat full or almost full fresh air) is suitable for diagnostic imaging rooms or hospital wards. With the appropriate options added, the unit can be configured to fulfil the requirements of the most demanding plant design conditions such as those for surgical rooms where highly specialized operations are to be performed.

All the internal components of the “H” Series air conditioners which are in direct contact with the airflow can easily be rendered hygienic as they can be reached and extracted by simply opening the access doors.

The entire machine is made accessible in this way. This means that maintenance and cleaning operations can be carried out correctly as scheduled, easily and quickly.
The air conditioners have been designed for both indoor and outdoor (accessory) installation. Their extreme compactness, reduced noise level and pleasing appearance all make them suitable for installation near the rooms to be conditioned, thus avoiding lengthy expensive duct work. External installation however requires the air conditioners to be positioned under a protective canopy to ensure comfortable access when maintenance has to be performed during bad weather.

There are two options available

  • Water

Uses the water supplied from a remote chiller as the source of cooling. Equipped with a three-way regulation valve as standard (two-way accessory) controlled by microprocessor.

  • DX

The “H” Series air conditioners with direct expansion coil are equipped with one or two independent cooling circuits. Low noise, high-efficiency, scroll-type compressors are used. The standard expansion valve is electronic and can therefore guarantee maximum control of the temperature with minimum energy consumption and effective antifreeze control of the evaporating coil.
The cooling circuits have all the components necessary for regulation, protection and safety. They are positioned, together with the electrical panel and all the controls, in a technical compartment on the right side, out of the treated airflow. They use the ecological refrigerant R410A which is completely harmless to the ozone layer and has a very low impact on the environment. The DX models can be matched with remote condensers. These are supplied with a nitrogen pressurization charge. The final charge together with any oil top-up is done by the installer on-site. The refrigerant and oil charges are done in our factory if the water cooled condenser (accessory) is incorporated.


To prevent airborne bacterial contamination of the room, the fresh air flow is passed through, in compliance with the applicable Regulations, standard G4 efficiency filters at the air intake of the machine (F7 as an accessory) and through F7 standard post-filters (F9 as an accessory) after the fan at the entrance of the air supply ducts. An M5 filter is also provided at the entrance of the suction air duct before the exhaust fan in order to keep the interior of the machine clean. The standard unit supplies approximately 250/300 Pa and can reach the 800/1,000 Pa static pressure (accessory) necessary for the essential sound damper and any terminal absolute filter. If this filter is present, it has to be installed directly in the room to be controlled as any other aeraulic element after it may contaminate the air flow. Selecting high static pressure exhaust fans also allows the installation of an absolute filter at the inlet of the re-suction air ducts before the sound damper; this, together with the management of the depression in the room, is necessary in order to avoid polluting the external environment if toxic substances are to be treated or septic operations carried out.

Return and exhaust fan section

Also this section has either one or two inverter-controlled plug fans to guarantee the required level of overpressure or depression in the area to be controlled. The standard external static pressure of the suction/exhaust fans is approximately 250 Pa. Fans with much higher static pressure can be installed (accessory) in order to manage, for example, external absolute filters: infectious departments etc. Double fans, with double inverters, can also be provided for use in emergency.

Version without exhaust fan section

A version without the return and exhaust fan section (accessory) is available for installations where the quantity of fresh air is limited to that necessary for the pressurisation of the room, without any provision for exhaust.

Airtight motorised dampers on all vents

As above, but airtight and certified Class 4 by TŰV in compliance with Standard DIN EN 1751.

Immersed-electrode humidifier

The standard humidification system is the immersed-electrode type. A characteristic of these humidifiers is the proportional production of steam between 10% and 100% of their capacity. The capacity of the humidifier can be selected depending on the quantity and condition of the fresh air.

Immersed-resistance humidifier

This accessory can guarantee excellent performance even when using water which is low in mineral salts, is demineralized or is generally of poor quality.

Microprocessor and software

All operating and safety functions of the “H” Series air conditioners are managed by the standard microprocessor. This allows the temperature and relative humidity to be controlled in three ways: proportionally, proportional-integrally or proportional-integral-derivatively. PID activation is assisted by an auto-tuning programme. The control of relative humidity is proportional. The microprocessor also controls overpressure and depression and can be easily connected to the BMS of all the major constructors.

Serial communication and supervision system: BMS

With the development of BMS (Building Management System), the problem of communication between the control systems of different companies becomes ever more frequent. it is not only the quality and reliability of the instruments that are important, but also the degree of external connectability that they can offer.

Be integrated into a system consisting of instruments from different constructors which share information via the integrated RS485 Modbus card and a gateway specifically designed for BACnet