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Fans

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Fans are essential for indoor cultivation in order to achieve a favourable climate for the plants in the growing room and at the same time prevent mould and disease. The three functions covered by fans are exhaust air, circulating air and supply air. Adequate ventilation is one of the main problems that need to be solved when growing indoors. Plants can only successfully exchange gases and grow healthily if both the supply of fresh air and the removal of stale air are ensured. In addition, a functioning ventilation system is also the key to solving all heat problems in the grow room, which are mainly caused by strong plant lighting.

A smoothly functioning ventilation system consists of at least two, usually three components - an exhaust air fan, a fan for circulating fresh air in the grow room and often an additional supply air duct, i.e. a fan that draws fresh air into the room.

Ventilation systems for exhaust air regulation in indoor growing

Exhaust air fans, also known as extractors, are one of the main components of any ventilation system, as they remove stale air to the outside and thus create space for fresh air. The extractor fan must have sufficient power to ensure the exchange of air in the entire growing space several times an hour - or at even shorter intervals.
How powerful the fan needs to be depends not only on the size of the growing space, but above all on the selected plant lighting and the associated heat development - the larger the space and the higher the temperature of the light sources, the more power the fan needs.
The ideal place to install a fan for air exchange is near the ceiling, as high as possible - hot air rises upwards and can best be removed from there. Conversely, this means that the inlet for fresh air should ideally be installed near the floor.

Calculating the required fan power for the grow room


To determine the right fan power for your box, you need the following basic data:
  • How many cubic metres does my cabinet or room have? Length x height x width
  • How many metres of hose do I need?
  • How often does the air need to be completely exchanged to achieve the desired effect?
  • Will an activated carbon filter be used?

Air circulation in the grow room with air circulation fans

If there is enough fresh air in the grow room, it still needs to be distributed well so that every plant in the room gets some of the cool breeze. Normal circulation fans with a rotary mechanism are perfect for this - what works for sweaty people in open-plan offices is also suitable for plants. They are inexpensive, distribute the air in the room and at the same time simulate a gentle breeze without constantly supplying air to a single point - this should be avoided as it could harm the plants.
The effect may not be as impressive as that of a powerful exhaust air fan, but it is at least as important: a recirculation fan can prevent mould, hot spots or accumulated humidity.

Supply air fans for active fresh air supply

Active air supply with the help of supply air fans simply means that an additional fan brings fresh air inside. This allows the diameter of the air inlet to be reduced, which can cause space problems in smaller grow rooms and grow boxes in particular. An inlet fan also relieves the other fan, which pumps the hot air outside, and can help with stubborn heat problems by providing additional cooling if required. This additional third component in the ventilation system is also recommended for a completely airtight system without odour emissions.