A 1x1x2 m tent is 2 m³, so a fan that does 120 m³/h would swap the air once a minute on paper. The extra capacity covers the filter and ducting losses. Hang the filter and fan at the top and pull air out, so the tent sits under slight negative pressure, with passive intake openings low down. Most people size the fan up and run it slow.
- Inline fan with a speed controller
- Carbon filter of the same diameter
- Ducting, kept as straight as you can
- Clip fan for air movement inside
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