Thanks, thought so.
I saw a fan, 6" CAN FAN FURNACE BLOWER DUCT BOOSTER GROW LIGHT - eBay (item 190292505745 end time Mar-16-09 17:04:16 PDT) -240 cfm, 6", it could be attached to the end.

Off to do more searching to see if I can find a post on a good fan for the cool tube.
Does anyone know if they make a cool tube with a fan already attached? I haven't been able to find one yet.

Buzzed :stoned: