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Extraction Fan Ø100 mm 105 m³/h
At 105 m³/h through a 100 mm connection, this is the most compact inline fan in the range — and arguably the most underrated component in a grow tent ventilation system. While most growers focus on their extractor, this fan excels as a dedicated intake unit, actively pushing fresh CO₂-rich air into the grow space instead of relying on passive vents that underperform in warm conditions. The lightweight axial design slides into any 100 mm tent port without brackets or tools. Also suitable as a standalone extractor for propagation areas and drying cabinets. Available at plantandflower.be with fast Belgian delivery.
100 mm inline fan at 105 m³/h – dedicated intake ventilation for grow tents
Every extraction system has an intake side, and that intake side is where most growers leave performance on the table. Passive tent flaps depend on negative pressure from the extractor to draw air in — a mechanism that weakens significantly on warm days when the temperature differential between inside and outside shrinks. This 100 mm axial fan at 105 m³/h converts passive intake into active intake, delivering a consistent flow of fresh, CO₂-rich air regardless of ambient conditions. Growers needing higher intake volume can step up to the 125 mm extraction fan at 185 m³/h for nearly double the airflow.
Why active intake matters more than most growers think
The physics are straightforward: an extractor fan creates negative pressure inside the tent, which should pull fresh air in through intake openings. But real tents have imperfect seals, undersized vents and restrictive mesh screens that limit actual airflow. The result is an extractor that works harder for less effective air exchange, higher internal temperatures, and stagnant zones where humidity accumulates. An active intake fan eliminates these variables. Position this 105 m³/h unit at a lower tent port — opposite the extractor outlet — and it pushes cool air directly into the growing space. The recommended intake-to-extraction ratio is 1:2 to 1:3, making this fan an ideal pairing with extractors rated between 200 and 350 m³/h. Your extractor handles exhaust and odour removal at the top; this fan ensures a steady supply of fresh air at the bottom.
Sizing guide: where 105 m³/h fits
As an intake fan, 105 m³/h serves grow tents up to 100 x 100 cm effectively. The intake fan does not need to match the extractor's capacity — its role is to ensure consistent fresh air supply rather than volume extraction. For propagation setups under fluorescent or CFL lighting, this fan also works as a standalone extractor. Heat output from these light sources is low enough that 105 m³/h provides adequate air exchange. In drying cabinets, the modest airflow maintains even moisture distribution without accelerating the drying process beyond optimal rates. Connect the fan to 102 mm aluminium ducting to route intake air from an adjacent room or outdoor source, and secure with hose clamps for an airtight seal.
Carbon filter compatibility and limitations
Some growers consider adding a Can-Lite 150 carbon filter to the intake line for air purification. While physically compatible via a 100-125 mm ducting reducer, axial fans at this power level lose a substantial percentage of their rated airflow when operating against filter resistance. For intake applications, running without a filter delivers the best results — the extractor side is where carbon filtration belongs. Reserve this fan for clean-air intake duty and let your main extraction system handle odour management through its own filter setup.
Order this 100 mm inline fan at plantandflower.be with fast shipping throughout Belgium. The smallest fan in the setup, but the one that ties the whole ventilation system together.
What is the ideal intake-to-extraction fan ratio for a grow tent?
An intake-to-extraction ratio between 1:2 and 1:3 works well for most setups. This 105 m³/h intake fan pairs effectively with extractors rated 200-350 m³/h. Keeping intake lower than extraction maintains slight negative pressure in the tent, preventing unfiltered air and odours from escaping through gaps and seams.
Where should I position an active intake fan in my grow tent?
Mount the intake fan at the lowest available tent port, on the opposite side from your extractor. This creates diagonal airflow across the entire canopy. Fresh air enters cool and dense at ground level, warms as it passes through the plant canopy, and exits through the extractor at the top where hot air naturally accumulates.
Can this 100 mm fan work as a standalone extractor for seedlings or clones?
For propagation areas under CFL or fluorescent lighting where heat generation is minimal, 105 m³/h provides sufficient extraction. The compact 100 mm form factor fits neatly into small propagation tents or DIY clone boxes without occupying valuable space needed for trays and humidity domes.
Is it worth adding a carbon filter to a 100 mm intake fan?
For intake purposes, a carbon filter is generally unnecessary and counterproductive. The filter resistance significantly reduces the already modest airflow of a 100 mm axial fan. Carbon filtration is most effective on the extraction side where air pressure is higher. Use this fan for unfiltered fresh air intake and handle odour control through your main extractor and its dedicated filter.