The Ultimate Mushroom Grow Tent Setup You NEED To Try! Mushrooms benefit from environmental controls such as humidity, fresh air, temperature, and light. This grow tent has 1 inline fan/duct for bringing in fresh air, 1 exhaust fan/duct for expelling CO2 and 1 LED light rope. One end of the inline fan ducting is capped with 2 vent covers stuffed with pillow stuffing. The other end of the inline fan ducting is connected to the humidity tote. So fresh air is brought in from the top of the grow ten