Review on Efficient IPower Non Insulated Aluminum Ventilation Kit: Enhance Airflow and Temperature Control by Carlos Reyes

Just like some other reviews said "it has holes", little holes for pins at the top and bottom of the duct. Not good, because now I'm going to close the air duct where it enters the tent to keep light out. Update: This is for a 4in 100cfm fan. This is a very weak fan, it is definitely not a 100cc fan. I don't know how much air this fan actually draws, but I know it's not much. I'll try changing the blade pitch to see if I can get it to draw more air. I may need to buy another one to attach to the other port of my tent. Or go back and get 6 or 8 inches. Two stars because it just doesn't pull the air like it should. Had to put at least 2 because he actually showed up lol.