as i said before you need a pretty powerful fan to run a cooltube properly, the best choice would be a centrifugal fan like a vortex inline and the second best choice would be a squirrellcage fan like the dayton blowers. the standard duct booster fans just aren't powerfull enough to push enough air over the bulb. the fan you just posted the specs for is still only about 215cfm which is less than half as powerful as the 1 i used for my 400hps cooltube. do a search for ecoplus or dayton blowers, you could probably find a 465cfm one for 60-70 dollars american shipped. my philosophy is always to try to get the best equipment possible so that way when your space is set up you can focus your efforts on growing the plants and not finding ways to get the temps down, humidity up, better air circulation, etc. you can learn from my mistakes as well as others here so you don't have to make them yourself. i wish someone would have told me to get a more powerfull fan when i was 1st building my cooltube, it would have saved me alot of time and money.
justaseed Reviewed by justaseed on . Ventilation Duct Fan For COOLTUBE Question I'm hoping to use it to make a cooltube for a 400w HPS, alternatively a 250HPS. Will this do? These are the specs: TD 160/100. 2 speed: 2500/2100 v/min. Effect 35/23 W. Decibel 39/35 dB(A). Max. air: 160 m³/tim. Rating: 5