A duct fan is the heart of every ventilation system in indoor growing. In a closed environment such as a grow tent, temperature rises quickly due to lighting (e.g. LED grow lights or HPS grow lamps), and humidity can also become critical. A duct fan reliably extracts stale air and replaces it with fresh air. Combined with a carbon filter, the grow also stays odor-tight and discreet.
Inline fans sit in your ducting and do the heavy lifting of extraction and intake. This collection includes Centro PL fans from 100 to 315 mm, Can-Fan Max-Fan and Max-Fan Pro EC models from 150 to 355 mm, the Can Q-Max AC 3-Speed in 150 to 400 mm, Garden Highpro TT 100, 125 and 150 extractors and the Garden Highpro Inline Extractor, plus the Platinum Inline Fan. Choose the airflow (m³/h) for your tent volume with reserve for the filter, and a diameter that matches your ducting. Add a fan controller, a carbon filter and read how to size your fan.
Questions & answers about Inline 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 →
Advantages of a Duct Fan
A powerful duct fan brings numerous advantages for your plants:
Stable temperatures: excess heat is quickly removed. Controlled humidity: prevents mold & excess moisture. Odor control: with a carbon filter the grow stays inconspicuous. Better CO₂ supply: fresh air promotes growth & flowering. Flexible use: suitable for small grow tents through to large grow rooms.
Applications in Indoor Growing
Duct fans are versatile and suit different setups:
Small grow tents (e.g. 40x40, 60x60 cm): compact models with quiet output. Medium-sized tents (100x100, 120x120 cm): medium fans with stronger extraction. Large grow rooms: high-performance fans for large air volumes and long duct runs.
Accessories for Duct Fans
For the duct fan to work efficiently, it's often combined with accessories:
Carbon filters: for clean, odor-free exhaust air. Fan controllers: automatic regulation of output & climate. Silencers: to reduce noise for discreet operation. Humidifiers & dehumidifiers: for an optimal climate at every phase.
Buy a Duct Fan
A duct fan is essential for healthy plant development in indoor growing. Whether a small grow tent or a large grow room – with the right fan, combined with a carbon filter and fan controller, you ensure perfect extraction, stable temperatures and maximum discretion.
