Hi grasscity Im jason and im new to this site I have a xtemepower US 6' inline fan 440cfm . the fan works well but since im only growing 3 plants i dont need maximum airflows that they create. So i got myself a vantech speed controller and heres where the problem appeared. I plugged the inline fan cord to the fan controller and plugged the fan controller cord to the wall. I changed it to variable mode and turned the knob to low medium and high . but no matter where i turn it didnt seem to work. It still is producing the maximum fan speed that it did before the fan controller. Is this a compatibility issue? Since i dont live in the states , i bought this product from Amazon and took me more than 12 days to be shipped . So advices would be highly appreciated . what should i buy for the 16 8 light control? I did it manually as my knowledge concerned with growing is extremely low. It would be nice if you guys recommened me a carbon filter, light timer, and other things that i should have in my grow tent. Thanks grasscity