the hardest part was finding the glass, i was planning on taking a straight glass vase a cutting the end of it off, (with a cool alcohol/string cutting trick,) but i got lucky and found a hurricane glass at a thrift store i got some pvc pipe fittings that fit the 3 inch duct and also fit right into the end of the glass, so i foil taped it....like almost everything else lol ...to the fittings and put a small computer fan at each end of the tubes .on one side i had to use a thin slice of a tuna can to keep the fan blades from hitting the tube.i wired both fans together and put them both on a timed power strip so the fans only went on when the light is on. then i cut a hole in each side of the flowering chamber and ran the whole cooltube system seperate from the normal exhaust.works like a charm. i run another computer fan as a mover right under the glass and i can get the plants touching the glass without burning its so cool.it makes quite the difference as far as light intensity and yeild.