infoforreport
Active Member
I recently installed a 6" can fan in an area created with black/white poly. Problem is the fan is so strong it makes the mh bulb tap the cooltube occassionally, (ping, ping, ping...ping). The poly is pulled tight with a huge amount of negative pressure. I tried running the other end of the cool tube outside of the area, but I still had the same issue. I got a variable speed controller to slow down the can fan as much as I could and it still happens. The duct run is pretty much straight up with no bends. I think I need to create more restriction to slow down the turbidity of air flow. Any suggestions?