Indoor Air Quality

Ventilation and air conditioning

Air handling units

The advantages of the Hidria air handling units are their modular design, simple interconnectivity of modules, low energy consumption, good sound insulation, long life span and easy maintenance. They comply with the European Directives for devices, low voltage and electromagnetic compatibility and they are approved with the following international certificates: TÜV (hygienic version) and Eurovent (Klimair2).


Our energy efficient and environmental friendly chillers are Eurovent certified. The units use the ecologically acceptable cooling media R410a and R134a and they range through the energy class A and A+. We also offer advanced solutions for constant free-cooling using a complete range of external temperatures, the night-time undercooling of a medium up to -8oC and an innovative hydraulic module with three circular pumps.

Air distribution and diffusion

A part of the Hidria range of programs is also a wide range of ventilating elements such as ventilating grilles and valves, circular, square, swirl and slot diffusers and air displacement units. The programme is rounded off with external elements, supply air nozzles and sound attenuators.

Fire and smoke protection

Beside comfort, each building must provide safety for its inhabitants. Ventilating systems need to prevent the spread of fire and smoke. The Hidria fire protection programme in air conditioning includes fire dampers that prevent the spread of fire and enable the evacuation, while smoke dampers exhaust smoke and heat and so diminish the effects of fire.

Fire and smoke dampers have been carefully tested according to numerous European and international fire protection regulations. The production process is constantly under the control of external authorized auditors. The continuous development in this area and Hidria's cooperation with the technical boards for fire protection regulation rank Hidria among the top suppliers in this field.

Variable Air Volume systems

According to the directives for the rational use of energy, the systems for supplying and exhausting air from the room must have precisely defined variable elements. For example, a preset maximal air volume is supplied if the room is fully occupied and a minimal air volume is supplied if the room is empty. The VAV systems can also be applied in clean rooms to maintain overpressure.

Air volume control

A practical example of the application of VAV control by room supervisory units such as CO2 sensors and room temperature sensors.

Pressure control

An example of the application of VAV controllers to maintain overpressure (master-slave). The polluted air is prevented from entering the room with cleaner air, which is especially important in laboratories, operating rooms, in food processing, in the manufacture of electronic and optical devices and components.