Grow room ventilation controls temperature, humidity and odour: an inline fan with a carbon filter extracts the air, a circulation fan moves it between the plants, and humidifiers, dehumidifiers and heaters correct the climate. A 120x120x200 tent needs 225–260 m³/h of real extraction. Here you will find PrimaKlima, Can-Fan, S&P, AC Infinity, Carbon Active, Can-Filters and ONA.
A complete set-up has four parts:
If you are starting from scratch, an AC Infinity grow tent ventilation kit in 100 or 150 mm combines an EC fan, controller and carbon filter already matched.
Ventilation and climate equipment are there to keep you within these ranges, measured with the lights on. With the lights off it can be 2–6 °C cooler, but never below 16 °C.
| Stage | Temperature | Relative humidity | Leaf VPD |
|---|---|---|---|
| Cuttings in a propagator | 22–25 °C | 80–90% | – |
| Seedlings | 22–25 °C | 65–75% | 0.4–0.8 kPa |
| Vegetative stage | 22–28 °C | 55–65% | 0.8–1.2 kPa |
| Flowering, first 5–6 weeks | 20–26 °C | 45–55% | 1.0–1.5 kPa |
| Flowering, last 2–3 weeks | 20–24 °C | 40–50% | 1.0–1.5 kPa |
If extraction alone is not enough, add the right device: humidifiers when the air is too dry, for example in winter with the heating on; dehumidifiers in a cellar or in the last weeks of flowering; heaters for cold nights in unheated rooms. This category also has CO2 meters and regulators.
In a flat or an apartment block, the exhaust air should not bother anyone. The foundation is a carbon filter sized to the fan's airflow. Odour control products such as ONA gels neutralise any remaining smell in the room, outside the tent. Ozone generators are fitted only in the exhaust duct leading outside: ozone must not be breathed in, so no people or animals in the treated space and never inside the grow tent with the plants.
Inline fans with EC motors use less power than AC models, adjust without humming and are quieter at reduced speed. For the rush of air in the ducting there are duct silencers in 125, 160 and 200 mm; for vibration, hang the fan on straps. Short ducting with few bends cuts both noise and airflow losses.
All prices are in Swiss francs including Swiss VAT. We ship throughout Switzerland with Swiss Post; bulky parcels go by courier. To size the extraction and climate of your tent, email our support team or call +41 79 359 67 58: Gro.w.LaB also gives advice in the shop in Quartino, by appointment.
An inline fan at the top with a carbon filter, fresh air through the low vents and an oscillating fan inside. The tent should stay under slight negative pressure.
Calculate volume × 60 × 1.3–1.5. A 120x120x200 tent needs 225–260 m³/h of real airflow, so a 125 mm fan rated at 300–400 m³/h.
In the vegetative stage 22–28 °C and 55–65% humidity; in flowering 20–26 °C and 45–55%, dropping to 40–50% in the last 2–3 weeks.
In almost all tents the passive low vents are enough. An intake fan helps in large grow rooms or with long ducting, and it must move less air than the extractor so the negative pressure remains.
