The Grow Superstore

Work out your tent's volume, exchange that air roughly once a minute, then add headroom: about 60% for a carbon filter, 20% for ducting and up to 50% for grow-light heat. Pair extraction with an intake 1.5-2× the exhaust area plus circulation fans; a speed-controlled EC fan is the best buy.

Grow room humidity control means holding relative humidity inside a stage-specific band: 65-80% for seedlings and clones, 50-70% in veg, 40-50% in early flower, 30-40% in late flower — with extraction, a dehumidifier and a humidifier backed by steady air movement.