High Volume - Low Energy
Free air systems

We specialize in the system solution of large volume low cost natural air exchanges, air cooling and treatment, circulation and disruption of temperature layers with air flow up to 550,000 m3 / hour.

The system is based on environmental technologies that meet the demands for extremely long life, almost zero maintenance, and outstanding price-performance ratio.

Heat Extractors

These are roof ventilation units designed to exhaust air and to ensure high-volume air exchange. Controllable fans are powered either by efficient EC drives guaranteeing extremely energy-saving operation or renewable energy resources completely for free!

HVLS Destratification Fans

These units are designed for re-/circulation of up to 550,000 m3/hour of fresh or mixed air. Controllable fans with a highly efficient brushless motor with a permanent magnet and frequency inverter guarantee extreme energy savings. These new generation units meet the ErP ECODesign directive.

Adiabatic Evaporators

These units are designed for supplying and treatment of fresh air and cooling of large buildings. The cooling procedure uses adiabatic vaporization of water without environmentally harmful coolants. Adiabatic cooling has lower investment costs and is up to 7 times more efficient than air conditioning!

Air Barriers

Air Barriers create an effective seal on the doorway by re-circulating the facility air in a laminar (smooth) flow across an open doorway. The kinetic energy in the moving air generates a barrier.


Infrared radiation heats the air indirectly by increasing the radiant temperature.


How does it work?

1. In summer, Adiabatic evaporators bring fresh outdoor air through the roof/skylights. At the same time, they clean, humidify and cool the air by at least 7°C. In winter they are either completely out of operation or they simply supply outside air without cooling.

2. In summer, HVLS Destratifiers take in conditioned air and ensure its even high-volume draught-free distribution with a flow rate of up to 550,000 m3. Air circulation decreases the temperature by up to 7°C. In winter the units take in warm air from below the roof and push it at very low rotations towards the floor. This equalizes air temperatures by disruption of various air layers by the so-called destratification up to a difference of 2°C between the floor and the roof.

3. In summer, Heat extraction turbines balance external and internal temperatures and remove used or polluted air through the roof. Permanent air rinsing reduces thermal load by up to 7°C and removes humidity. In winter, the operation of ventilation turbines may be limited in order to prevent heat loss.

4. In summer, Air barriers barriers keep cooled air inside the building by re-circulating facility air in a smooth uniform flow, creating a seal on the doorway. In winter, the seal prevents heated air from escaping the building. In both cases, the system provides environmental separation, reduces door cycles and increases life expentancy of cooling and heating systems.

5. Luminous Infra-red Gas Heaters during winter, infrared radiation heats the air indirectly by increasing the radiant temperature. Rays of radiation strike the employees' skin, floor, machines, materials and other objects. Surfaces absorb heat energy that dissipate it into the environment while they heat up. The result is a pleasant air temperature together with an ideal perceived temperature for the highest comfort of employees.

Main advantages of the FAIRAIR system include the following:

The system of smaller independent units brings air inside the building through existing opening in the shell of the structure without any air ducts. The decentralized system allows easy extension or gradual addition of new units.
2 Modularity
The system is a construction set and consists of light units with compact dimensions. The unit easily fit in the building, do not occupy valuable interior space, and are independent of the infrastructure of the building.
The system is highly variable including various dimensions, performance, power sources, and purposes. Due to the wide range of models and their alternatives, the system is suitable for various types of applications.
Each part of the system technology can work independently. Various types of technologies might be combined. The system can also combine various units, technologies, or their alternatives.
The system can be adapted to any zones according to individual needs, type of production, or the purpose of the building. The system thus offers solutions tailored to any project.
6Quick and easy installation
Compact dimensions and low weight enable easy handling and quick and easy installation under the ceiling, to the skylights or the roof without considerable cuts in production. The units are supplied as plug & play.
7Reliable operation
The units are made of durable materials – marine aluminium, UV stable ABS or stainless steel. They have extreme service life of up to 25 years. The use of multiple units makes the system extremely robust and reliable.
1Precise control and regulation
The control systems optimize the use of resources, adjust to the local requirements, and keep low costs. The units are controlled individually, in lines, or in zones. The control system is manual, remote, or via a mobile application.
2Long service intervals
The technology is characterized by simplicity and reliability. Any maintenance can be performed under operation. There is no need to shut down the entire system. The service interval is up to 25,000 hours of continuous operation at maximum power.
3Hygienic and environment-friendly
The supply air is not contaminated by soiled air ducts, which are difficult to clean. The absence of air ducts means the absence of pressure loss, which decreases fan power. Moreover, the units are compact and have a simpler structure.
4Lower heat loss
The air flow is stable and even. The supply of warm air from under the roof and the large-volume circulation significantly reduces thermal stratification, which reduces thermal loss through the roof.
5Energy efficient
Controllable fans with high efficiency ventilation either use brushless motors with a permanent magnet and frequency inverter to ensure extremely energy-saving operation or renewable resources completely for free.
6Multiple savings
The lightweight and compact units of the system save investment costs. The high-efficiency technology saves operating costs. The disruption of thermal stratification decreases heating costs. The slower draught-free air flow represents a cost-efficient solution. The system features cheaper duct-free air transport.

Comparison of FAIRAIR HVLE systems with HVAC systems

1 HVLE – High Volume Low Energy
2 HVAC – Heating, Ventilation, Air Condition