The K1608 Whisper is a full metre of low-noise filtration. The long body lets a high volume of air pass the carbon slowly, so a busy room stays quiet. Optimal airflow is 1100m3 per hour and the maximum is 1440m3 per hour. A 160mm flange matches larger EC fans.
At 13.7kg this is a heavyweight that needs proper anchor points or a stand. The depth of carbon gives long odour control across several light cycles. Multi-light growers who need quiet running, perhaps in a converted room at home, choose this size. Connect it on the extraction line and let a whisper blower draw through it.