Fans

Inline Fans for Your Exhaust System

Fans are an essential component of your indoor grow. They ensure that fresh air is supplied and used, warm air is reliably removed from the grow tent. Especially with modern LED setups, which generate less heat than older sodium vapor lamps, a precisely tuned exhaust system is crucial for a stable climate—without heat buildup or excessive humidity. At the same time, activated carbon filters prevent unwanted odors from escaping.

Whether compact cultivation in a tent or larger indoor grow rooms—we offer suitable solutions for all scenarios. Exhaust fans with EC motors are particularly popular, allowing you to operate your setup pleasantly quietly—even in apartments. This creates an efficient, quiet, and odor-free environment for your plants.

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How to Find the Right Grow Exhaust Fan

Determine Fan Size: Consider Lighting, Area, and Location

To find the appropriate exhaust fan, you should consider the area of your grow tent, the location within the building, and especially the type of lighting you use. Modern LED panels generate significantly less heat than outdated sodium vapor lamps—this reduces the required airflow. For small setups under 1 m² (e.g., 40x40 cm, 60x60 cm, or 80x80 cm), a fan with 100–300 m³/h is usually sufficient. For 1–1.5 m², we recommend 300–600 m³/h, and for larger areas from 2 m², accordingly 600–800 m³/h. If your tent is under the roof or in a rather warm room, you should plan a bit more generously.

Choosing the Fan Type – AC or EC

Once you have found the right size, you decide on the type of fan. Asynchronous motors (AC) have been around for a long time; the first was built based on a principle by Tesla in 1882. These can be dimmed or switched with almost any control device. However, the humming noises caused by dimming can be perceived as disturbing. Electronically commutated motors (EC), on the other hand, are significantly more efficient but have the disadvantage that they can only be controlled by special devices. However, they are almost noiseless even when dimmed.

As a rule of thumb: Base area × 300 gives a rough estimate for the exhaust capacity in m³/h—under LED lighting and normal conditions. For sodium vapor lamps or warm rooms, plan accordingly more. In the following overview, we show you suitable fan sizes for common grow tent formats.

Suitable Exhaust Fans for Your Grow

Grow AreaAirflowExhaust FanExhaust Set
up to 0.2 m² (40 x 40 cm)0 - 100 m³/hExhaust fans with 0 - 100 m³/hCultivalley Mini 105m³/h
up to 0.4 m² (60 x 60 cm)100 - 200 m³/hExhaust fans with 100 - 200 m³/hCultivalley Basic 160m³/h
up to 0.7 m² (80 x 80 cm)200 - 300 m³/hExhaust fans with 200 - 300 m³/h 1-Speed • 2-Speed • Thermo
up to 1 m² (100 x 100 cm)300 - 400 m³/hExhaust fans with 300 - 400 m³/hPrima Klima 1-Speed 360m³/h
up to 1.5 m² (120 x 120 cm)400 - 600 m³/hExhaust fans with 400 - 500 m³/h 1-Speed • 2-Speed • Thermo
up to 2.5 m² (150 x 150 cm)600 - 800 m³/hExhaust fans with 700 - 800 m³/h 1-Speed • 2-Speed • Thermo
When in doubt, it's often worth choosing a slightly more powerful fan. This gives you performance reserves on warmer summer days. Why? If your ventilation is already running at maximum capacity in winter, it will quickly become insufficient in summer—leading to a dangerous temperature rise that could harm your plants and equipment. Also, a larger fan running at a lower setting is usually much quieter than a smaller one operating at full power.

What do 1-Speed, 2-Speed, and Thermo mean in the recommendations?
  • 1-Speed: Fan runs constantly at a fixed speed – simple, reliable, and cost-effective.
  • 2-Speed: Two fixed performance levels (e.g., 250/400 m³/h) – switchable as needed.
  • Thermo: Temperature-controlled fan – automatically adjusts performance to the ambient temperature.
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