Parts List:
64qt tub from Fred Meyer ($12)
Bag of Pearlite ($5)
Humidifier ($20)
PC Fan ($10)
Timer x 2 ($30) - I am upgrading to some sort of sensor controlled set up, where I don't need to mess with scheduling for optimum condition.
Construction:
1 hole on lid for in take fan, one hole in middle for humidifier, and 2 half inch holes behind lion's mane for exhaust (opposite end of intake fan toward bottom of the box) . I didn't use an exhaust fan, because positive pressure from intake fan is enough to push out CO2 floating on the bottom.
https://www.amazon.com/gp/product/B07X5NS63Z/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
Use this, and just attach a tube on the top, and stick the other end into your grow space.
Mine’s a humidifier from Amazon. Here’s the link