• Energy saving
  • Dehumidification
  • Improved working climate


The AIR2-Fish is a heat exchanger developed for Recirculating Aquaculture Systems (RAS). With the heat exchanger the building can be dehumidified without heat being lost. With the system the heat of the exhaust air is transferred to the intake air, without the air being mixed. This enables increased ventilation and thereby dehumidification of the room. The working climate and the sight in the room improve. The risk for mold at the walls is minimized.

Advantages of heat regaining

With a heat exchanger a thermic efficiency of over 70% can be realized. Less fossil fuels are used, reducing the energy costs. The room is dehumidified and has improved ventilation thereby improving the working climate.

The system

The heat exchanger for fish farms is produced completely from plastic. The housing of the exchanger is produced from insulating polyethylene sheets with a ‘hollow chamber principle’. These are welded together airtight through extrusion weld. For heat exchanger with a lower capacity, a cheaper PVC housing can be chosen. The exchanger blocks are produced from ABS and PVC tubes. The complete heat exchanger is resistant to corrosion, guaranteeing a long lifespan.

The intake and exhaust fan are calculated for the needed capacity of the exchanger. Through polyethylene ventilation tubes the air is sucked out of the room. The air is distributed in the room through perforated foil tubes.


The exhaust air is brought into the exchanger through PE ventilation tubes. Here the air is sucked through the tube vertically, from bottom to top. Turbulence occurs inside the tubes, thereby lengthening the path of the air and increasing efficiency. The intake air is sucked past these some tubes and blown into the room. The heat transfer takes place during this process. The chosen material and thickness of the tubes are optimized so that heat transfer and stability of the system are maximized.

Air distribution

The intake is distributed through plastic foil tubes in the ridge of the building.

Cleaning and maintenance

Since both the intake and exhaust air is clean, the system does not need further cleaning. For maintenance, hatches are placed at the top of the tube.