Caluma’s Axial Fan 100 mm 2‑stufig is an in-line axial fan for intake or exhaust in small grow tents. It offers two preset speeds delivering 225 or 295 m³/h, switched on the housing, so no external controller is required. The 100 mm (10 cm) duct opening mates with standard 4‑inch ducting and Caluma filters. Electrical power draw is 35 W. Caluma indicates suitability for tents up to about 80×80 cm and also 120×60 cm. The fan arrives pre‑wired and includes four plastic mounting feet for straightforward installation. Two fixed stages make it easy to match airflow to plant stage and ambient conditions while maintaining steady exchange in compact setups. Designed for continuous operation, it suits entry‑level ventilation builds.