Which extractor should I choose for my grow tent?

Calculating Required Airflow for Tents with HPS Bulb

Note that this varies from the ambient temperature in the growing location, or also for example in winter you will need less flow, while in summer you will need maximum air flow.

1. Tent with HPS 250W

• 60x60x160 cm

  • Minimum flow rate: 200 m³/h
  • Maximum flow rate: 300 m³/h

• 70x70x160 cm

  • Minimum flow rate: 180 m³/h
  • Maximum flow rate : 300 m³/h

• 80x80x180 cm

  • Minimum flow rate: 150 m³/h
  • Maximum flow rate : 280 m³/h

2. Calculating the Required Air Flow for Tents with a 400W HPS Bulb

• 100x100x180 cm

  • Minimum flow rate: 300 m³/h
  • Maximum flow rate : 450 m³/h

• 120x120x200 cm

  • Minimum flow rate: 300 m³/h
  • Maximum flow : 400 m³/h

3. Calculating the Required Air Flow for Tents with a 600W HPS Bulb

• 120x120x200 cm

  • Minimum flow rate: 480 m³/h
  • Maximum flow rate : 720 m³/h

• 150x150x200 cm

  • Minimum flow rate: 400 m³/h
  • Maximum flow rate: 650 m³/h

4. Calculation of Required Air Flow for Large Installations

• 4 HPS 400W or 600W in a 200x200x200 cm box

  • 400W : 1200 to 1600 m³/h
  • 600W : 1400 to 2000 m³/h or more depending on conditions

• 2 HPS 600W in a box of 240x120x200 cm

  • Minimum flow rate: 900 m³/h
  • Maximum flow rate : 1300 m³/h

• 2 HPS 600W in a 300x150x200 cm box

  • Minimum flow rate: 800 m³/h
  • Maximum flow rate : 1200 m³/h

Why these Flows?

The minimum flow rate ensures sufficient air exchange to maintain temperature and humidity at optimal levels. In cases of excessive heat (for example, during heat waves or in poorly ventilated spaces), a higher air flow is needed to quickly release excess heat and protect plants.

5. Importance of Air Intraction

The air intraction should be adjusted to match the airflow required by the extractor . Generally, it is advisable to have a slightly lower intraction to maintain a slight depression in the tent, which helps to contain odors and improve the efficiency of the carbon filters.

6. Using Carbon Filters

Carbon filters should be sized to match the airflow of the extractor . For example, if you are using a 600 m³/h extractor , it is better to use an extractor of the same flow rate or higher, in order to maximize odor filtration. Make sure that the carbon filter can handle this flow rate to avoid filter saturation and maintain effective air purification.

7. Interior Fans and Placement

Oscillating fans should be placed to ensure even air circulation around the plants, avoiding pockets of heat and humidity. Floor fans can also be used to help evaporate moisture from the floor and prevent mold from forming.