G-Tools Mini Axial Fan & Prima Klima Eco Carbon Filter Kit125mm / 185 m³/h

This matched 125mm fan and carbon filter kit keeps small grow spaces cool, fresh, and odour-free without overcomplicating the setup. It suits growers running up to 250W of lighting in compact tents or enclosed cabinets.

Heat and stale air are the two fastest ways to stall plant growth in a confined space. The G-Tools axial fan pushes up to 185 m³/h through a 125mm duct, enough to cycle the air in a small tent every one to three minutes. That regular turnover replenishes CO₂ for photosynthesis and stops heat from lamps building to damaging levels.

The Prima Klima Eco carbon filter is rated to 240 m³/h - comfortably above the fan's output. This headroom means the activated carbon bed is never overwhelmed, so odour scrubbing stays effective throughout the filter's lifespan. Both components share a 125mm diameter, so connection is direct and straightforward.

This kit is a practical starting point for anyone setting up a grow tent or compact cabinet with a single lamp up to 250W. Pair it with a G-Tools Bonbon or similar small cabinet, run the filter at canopy height or at the top of the tent where warm air collects, and connect them with a short length of 125mm acoustic or aluminium ducting. Keep the fan running continuously on a basic timer or climate controller for best results.

After roughly 12 months of continuous operation, replace the Prima Klima filter cartridge. Carbon becomes saturated over time and odour control declines gradually rather than suddenly - so marking a replacement date on installation is good practice. The fan itself requires no routine maintenance beyond an occasional wipe of the blade housing to prevent dust buildup affecting airflow.

Grower’s Note: In a sealed or near-sealed small tent, CO₂ depletion can slow growth noticeably within hours of lights-on. Running this fan continuously - rather than on a simple on/off timer - ensures a steady supply of fresh air. If you switch to a thermostat-controlled cycle, set the minimum 'off' period to no longer than two minutes to avoid CO₂ drop-off during warm lamp cycles.

Priced at £83, with free UK delivery.