G-Tools 125mm Inline Fan with Thermostat Controller & Prima Klima Eco Carbon Filter420 m³/h

This G-Tools extraction kit pairs a 125 mm, 420 m³/h thermostat-controlled fan with a Prima Klima coconut-shell carbon filter in one ready-to-install bundle. It suits growers running a single 600 W light who want automatic climate control without buying components separately.

The fan is built around a German EBM Pabst motor fitted with a backward-formed impeller. That impeller design moves up to 15% more air than a standard forward-curved blade at the same wattage. At 420 m³/h through a 125 mm duct, it handles the heat and humidity load of a single 600 W HPS or equivalent LED grow comfortably.

The integrated thermostat controller is what sets this fan apart from a basic speed-control unit. You dial in a target temperature and a minimum running speed. Below your set temperature the fan holds that minimum speed, keeping air moving steadily without over-cooling the canopy. When heat rises above your threshold, the fan ramps straight to full speed. This is particularly useful when lights cycle off and the room cools sharply - the fan does not drop to zero and stall your ventilation.

The Prima Klima Eco filter uses certified coconut-shell activated carbon throughout. Coconut-derived carbon has a denser micro-pore structure than mineral or standard wood-based carbon. That means more surface area per gram to trap odour molecules and fine particles through both physical and chemical absorption. The pressed-metal body keeps its shape under duct tension, and the extra-long 125 mm flange mates directly with the fan collar for a firm, leak-free join.

For installation, mount the filter vertically or horizontally inside the canopy, connect the fan via the collar, then run 125 mm ducting to your exit point. Pair this kit with a Sanlight LED panel and you keep heat output modest, which means the thermostat controller rarely needs to run at full speed. If you are growing in a G-Tools grow cabinet, check the internal duct routing before ordering - the 125 mm collar dimensions should align with the cabinet's extraction port.

Grower’s Note: Carbon filters work best when air passes through the bed slowly enough for the carbon to absorb odour molecules fully. Running this fan at minimum speed during lights-off is good practice - it keeps a small negative pressure in the tent and prolongs filter life. Replace the filter when you notice odour breakthrough, typically after 12-18 months of continuous use depending on crop load and humidity. High humidity above 70% RH accelerates carbon saturation, so keep your climate in check and the filter will last its full service life.

Priced at £239, with free UK delivery.