Internal Air Movement for Stable Storage Microclimate

VRE recirculation fans are designed for continuous internal air movement in vegetable storage rooms, greenhouses and other agricultural buildings where temperature and humidity must remain uniform. They do not replace the main ventilation or cooling equipment; they support it by preventing stagnant air layers and reducing local condensation risk.

In storage practice, even a correctly designed supply and exhaust system can leave zones with slower air movement. Recirculation fans help mix the air mass, move heat and moisture toward the active control zones and make the overall microclimate more predictable.

VRE recirculation fan for agricultural storage 1 — VRE fans are placed inside storage rooms or greenhouses to mix the air volume between active ventilation cycles.

How VRE Fans Support Crop Storage

The fan creates a directed air stream across the room. This helps reduce temperature differences between upper and lower air layers, supports evaporation from wet surfaces and limits the formation of cold or humid pockets near walls, ceilings and corners.

For vegetable storage, recirculation is valuable during holding periods, drying phases and transitions between cooling, ventilation and heating modes. In greenhouses, the same principle improves temperature uniformity around plants and structural surfaces.

Construction and Options

Axial fan layout: flanged cylindrical housing with a matched impeller and asynchronous three-phase motor.
Materials: impellers are available in composite or galvanized steel; housings are made from galvanized steel or polymer-coated steel.
Protection: IP54/IP55 motor protection is suitable for demanding agricultural rooms.
Mounting options: protective guards and mounting bases can be specified for the installation layout.
Heating option: a 1.5 kW electric heating element can be used where recirculation and light air heating are combined.

Model Range

VRE-560 AGVF

Airflow: 8,800 m3/h
Motor: 0.37 kW, 380 V
Speed: 960 rpm
Protection: IP55
Diameter group: 610 / 590 / 570 mm

VRE-560 AI

Airflow: 8,120 m3/h
Motor: 0.37 kW, 380 V
Speed: 885 rpm
Protection: IP55
Diameter group: 610 / 590 / 570 mm

VRE-630 AGVF

Airflow: 11,360 m3/h
Motor: 0.37 kW, 380 V
Speed: 960 rpm
Protection: IP55
Diameter group: 680 / 660 / 640 mm

VRE-630 AI

Airflow: 10,470 m3/h
Motor: 0.37 kW, 380 V
Speed: 885 rpm
Protection: IP55
Diameter group: 680 / 660 / 640 mm

VRE-710 AGVF

Airflow: 13,050 m3/h
Motor: 0.37 kW, 380 V
Speed: 885 rpm
Protection: IP55
Diameter group: 710 / 760 / 720 mm

VRE-800 AGVF

Airflow: 20,890 m3/h
Motor: 0.75 kW, 380 V
Speed: 960 rpm
Protection: IP55
Diameter group: 850 / 830 / 810 mm

Selection Notes

Fan selection should be based on room geometry, ceiling height, crop arrangement, container rows, rack layout and the position of refrigeration, heating and ventilation equipment. Units should support the intended circulation pattern instead of creating short loops or opposing air streams.

In larger rooms, several VRE fans are normally distributed along the length of the chamber. Where a heating element is used, heated and non-heated fans can be alternated to avoid local overheating and to distribute thermal energy more evenly.