I found some instructions:

DIY: Best Cool Tube - Grasscity.com Forums

It talks about an open ended cool tube. Would that work? It would be an air intake obviously at the open end of the cool tube but seems like it would really fuck me over if I just left half of the glass tube open to the grow chamber and the other half being a duct leading to the 4" inline fan blowing air outside the chamber.

Or I guess since there would be that much air flowing across the bulb that it would effectively cool it down? I'm still kind of new to the idea of cool tubes and if they weren't being sold for hundreds of dollars I wouldn't believe that just running a little air over a hot bulb would cool the grow chamber so much.

Anyway the reason I ask is because I want one end of the cooling tube contraption (the intake end) to be open to the chamber to get some new air flow past the plants as well as just the bulb.
submast3r Reviewed by submast3r on . So I'm making a cooltube. I have a question I found some instructions: DIY: Best Cool Tube - Grasscity.com Forums It talks about an open ended cool tube. Would that work? It would be an air intake obviously at the open end of the cool tube but seems like it would really fuck me over if I just left half of the glass tube open to the grow chamber and the other half being a duct leading to the 4" inline fan blowing air outside the chamber. Or I guess since there would be that much air flowing across the bulb that it would Rating: 5