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The specs show that as 190 CFM. Not sure if physical size is what you mean by smallest, but I just ordered a Soler & Palau TD100 https://www.amazon.com/Soler-Palau-TD-100-line-Exhaust/dp/B0027E3Q4Y/ref=sr_1_1?ie=UTF8&qid=1481215804&sr=8-1&keywords=solar+palau+td100; it's rated at 100 CFM.

After obsessing about this for the past few days, I just ordered a Soler and Palau (S&P) TD-100 4 inch inline fan, rated at 101 CFM. Shopping next for a speed controller, then a carbon filter...

WeedFreak78: Took me a full day to realize the true potential of your suggestion. Here's a modification: I could leave the fan inside the tent (on a speed controller, dialed down), and split the output in two -- half exhausts out of the tent, the other half just vents back into the tent. Helps...

Thanks -- I'm thinking it really is too powerful, and I shouldn't have to fight it so. The other possibility is a homemade system using a 50 CFM bathroom exhaust fan, as described here: https://www.icmag.com/ic/showthread.php?t=45196. Stealth is somewhat important -- about to be legal in my...

The $20 fan speed controllers all have Low, Medium, and High settings. Any idea how to estimate how these effect CFM? If there's a formula, great, but I suspect there isn't, and I have no idea how to guess. In particular, I'm considering a 4" 190 CFM inline fan. Run it through a carbon...

Hi All -- I have a 2x4 Gorilla grow tent on the way; it's just about 7 feet tall, making it 56 cubic feet. I need to ventilate it through a carbon filter, and my first thought was a 4" inline fan, but it seems that these are all rated at something near to 190 CFM. Even allowing for a reduction...