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I'm going to build a diy cool tube using the bake-a-round tube. I'm hoping the 4" elicent will be enough to suck through a diy carbon scrubber (4" duct, 6" outside diameter, about 12-15" long, hung from top of cab) through the cool tube, then out of the top of the cab. My goal is to cool, ventilate, and deodorize with the one fan. I will also have at least one desk
fan blowing across the bulb/canopy.
Should be fine with the 4 in., but a lot depends on the room temps where you're pulling the air from. Running the cab at night when the temps don't fluctuate so much helps.
I had a similar setup but with a smaller fan (129 cfm) and a 400 hps. In a smaller closet than yours the temps were better (not ideal, though) than in my bigger closet (their dimensions are in the first posts of my last two grow logs in my sig). Would have been much better if I had just run the last one at night but wasn't expecting such high daytime temps so early in summer.
Well, I think I've changed my mind... Again...
I have decided to up the cabinet dimensions to 28"x37"x65" tall. I'll use a 400 watt HID (switchable bulb), a 6" elicent inline fan and 6" ducting. I'll still be making my own carbon scrubber (6" inside, 8" outside, about 12-15" long) but will likely just buy a cool tube so that it fits into the 6" ducting without reducers.
The system will be:
DIY scrubber ----->6" cool tube---> 6" elicent inline----> possible DIY duct muffler-----> out of cabinet.
Total volume is about 40 cubic feet. I need at least 40x3=120 cfm to clear the air 3 times per minute. I think the 247 cfm elicent will be fine even with the resistance due to the scrubber and cool tube. What'ya think?
I have noticed that elicent makes two 6" fans, the 150A and the 150B. One is 247 CFM, one is 309 CFM... Now I just have to pick one... Any recommendations?