G-Tools GT-125 Inline Fan & Prima Klima Eco Carbon Filter Combo420 m³/h

The G-Tools GT-125 combo pairs a 125 mm Swiss-motor inline fan with a Prima Klima virgin-carbon filter in one matched kit. It is the go-to choice for growers running up to 600 W HPS who want reliable odour control from day one.

This kit is sized and specified for grow rooms running HID lighting up to 600 W. At 420 m³/h, the fan turns over enough air to keep temperatures and humidity in check while the Prima Klima filter handles all odour before air leaves the space. Buying fan and filter together removes the guesswork of matching components.

The GT-125 uses a Swiss-made MES AC motor fitted with backward-formed impellers. That impeller design increases airflow by up to 15 % compared with forward-curved alternatives. Crucially, the motor holds close to its rated 420 m³/h even under the resistance of ducting and a loaded carbon filter - a real-world advantage that cheaper fans rarely deliver.

Prima Klima filters use virgin activated carbon - carbon that has never previously been used in any filtration application. This matters because recycled or lower-grade carbons saturate faster and can allow odour breakthrough earlier in the filter's life. G-Tools recommend annual replacement regardless of apparent performance; keeping a spare filter on the shelf means you are never caught short mid-crop.

Setup is straightforward. Use a 125 mm collar to connect fan and filter directly, saving a length of ducting and reducing noise transfer. The included mounting bracket lets you hang or fix the fan in whatever position suits your cabinet or tent. When you need quieter running at lower temperatures, pair the fan with a basic single-channel fan controller - the MES motor responds cleanly to voltage reduction.

Grower’s Note: Carbon filters work best when air is drawn through them rather than blown. Always position the filter on the intake side of the fan - pulling air through the carbon bed - and seal any duct joins well. Even small air leaks downstream of the filter will allow untreated air to escape and undermine odour control, regardless of filter quality.

Priced at £155, with free UK delivery.