i started with just a 4 inch duct fan but it wasn't strong enough so i switched to a 465cfm squirrelcage and i did not use clean outside air, the cooltube actually was also a second exhaust fan. my cooltube looked like yours, mine was a pyrex bake-a-round bought on e-bay.
justaseed Reviewed by justaseed on . PR1 3 plant scrog 400w cabinet grow soil This is my first scrog attempt. I have had 2 previous grows in a small cabinet here are the pictures of my cuttings in the soil one week after repotting from the clay balls I got them in. In here youll see my home made cool tube. Probably my best invention yet! Rating: 5