An extraction fan is a central component of every indoor grow. In a closed environment such as a grow tent, a humid, warm climate quickly builds up that causes problems without adequate ventilation. Extraction fans reliably remove warm, humid air and bring fresh air in from outside. Combined with carbon filters they also prevent unwanted odors – for a stable, healthy plant climate and maximum discretion.
An extraction fan pulls warm, humid air out of your tent and creates the slight negative pressure that keeps odours inside. Here you'll find Centro PL extraction fans from 100 to 315 mm with 290 to 1,900 m³/h, and the Isobox Foam silent extraction fans from 1,200 to 5,000 m³/h, built into an insulated box for quieter operation. As a rule of thumb, the fan should be able to exchange your tent's air volume about once a minute, with extra capacity to compensate for the carbon filter and ducting. Choose a diameter that matches your filter. Pair it with carbon filters and fan controllers, and read how to size an extraction fan.
Questions & answers about Extraction Fans
All growing questions →- Ventilation & odour What fan size (m³/h or CFM) do I need for my grow tent? Work out the tent volume (width x depth x height in m³) and pick a fan that can move at least that much air per minute, so roughly 170 m³... Read the answer →
- Ventilation & odour What is the best ventilation setup for a 1 x 1 m grow tent? An inline fan of roughly 150 to 250 m³/h pulling through a matching carbon filter, some ducting, and one small clip fan inside. Read the answer →
- Ventilation & odour Where should the air intake and exhaust go in a grow tent? Exhaust at the top, where the hot air collects. Intake low, ideally on the opposite side, so fresh air sweeps across the plants. Read the answer →
- Ventilation & odour How do I make my grow tent fan quieter? Turn it down with a speed controller, hang it so it doesn't touch anything, and keep the ducting straight. Read the answer →
Why Extraction Fans Are Essential
A powerful extraction fan brings many advantages:
Stable temperatures: prevents overheating from lamps such as LED or HPS. Controlled humidity: protects plants from mold & disease. Better CO₂ supply: fresh air promotes growth. Odor control: stays discreet when combined with a carbon filter. Flexible use: suitable for small grow tents through to large grow rooms.
Extraction Fans in Indoor Growing
Choosing the right extraction fan depends on the size of your growing area:
Small grow tents (e.g. 40x40, 60x60 cm): compact fans with lower output. Medium-sized tents (100x100 cm, 120x120 cm): duct fans with medium output. Large grow rooms: powerful extraction fans with high airflow and optional control.
Systems can also be combined with fan controllers, humidifiers, dehumidifiers and circulation fans to create a perfectly regulated climate.
Accessories for Extraction Fans
To help extraction systems work efficiently, the following accessories are often used:
Carbon filters: reliably neutralize odors. Duct fans: for constant air exchange in the grow tent & grow room. Silencers: reduce noise for discreet operation. Climate controllers: automatic regulation of temperature & humidity.
Buy Extraction Fans
An extraction fan is the heart of every ventilation system in indoor growing. It stabilizes climate and humidity, protects against mold and ensures a discreet, odor-free environment. Whether a small grow tent or a large grow room – with the right extraction fan you give your plants the best conditions.
