One for each tent man, fuck all this you cant run a cooltube and filter on the same fan bullshit...maybe if you lived in a desert or something, but east coast Ireland? Lol!
I have it running filter => ducting => cooltube => ducting => fan.
I have the TT125 standards too, which max out at 270cfm, and they do a fucking sweet job, with the ducting sealed up properly it actually makes the fan at least 4x quieter.
If you run an exhaust system with fan and filter, there is no excuse for not getting a cooltube for the sake of €40. Its insane the difference they make! Im getting insane vegging off the MH btw, for the sake of a different bulb its seriously worth it. Cant wait to flower these, make sure you all keep an eye on it, its gonna rock out!
Smoked a bit, excuse the ramblings