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:
BuzzLightOne Reviewed by BuzzLightOne on . Do I need to vent 400 HPS Cool Tube in a 4'X4' space? I have a 4'x4' area, with 1' section for veg, and a 3'x3' section for bloom roughly. I am going to use cfl's for veg, so heat shouldn't be an issue there. The bloom side will have a 400w HPS in a Cool Tube. Do I need a fan to blow through the tube, and do I need to exhaust the hot air through a vent to the outside. The space gets warm, not hot in the summer, and cooler than the rest of the house in winter. I would apreciate your input and ideas. I am not much of a DIYer. Easy, simple, Rating: 5