"Criom - Why do you need such a long run on the duct?"
because i was planning on mounting the intake duct to my air conditioner which is about 9 feet away, i could just intake from the room and use 3-4 feet.

"I think a bead of silicone sealant would make a leak-free connection."

should i be using this for every connection made even to the fan?


"If there's lots of airflow, such as in PharmaCan's case (he's got a bigmuthahompin' centrif on his cooltube), each cubic foot of air passing over the lamp tubes has to absorb less heat and has less time to do so than with smaller fans, so the actual tube output air temp won't be very high for him. He can get away with having his blower downstream, sucking air through the tubes. Betting his cooltube air exhaust temp isn't over 90F, probably less.

If you're not moving air at huge rates, it will get warmer as it spends longer in the cooltube. Fans of lower capacity should be placed upstream, blowing air first over the socket."

hm if i am going to get the smaller fan, and as you say it should be mounted blowing over the socket...would it be a bad idea to mount the fan right on the cooltube ? or maybe with a small piece of ducting in between it so it was blowing as hard as possible directly up the socket and over the bulb.

im not sure if the vibrations from that would damage the bulb or not, could block the light a little too i guess