250w Cool Tube - Width issue - Fan?

I have to use this cab. It is what is, so no point in fighting it. The cab is 26 in wide.

I ran 400w of CFLs last grow and wanted HPS for this one. I'm going to be running 250w HPS in a cool tube. The cab is not deep enough for another reflector and the tube is 19in wide. Ducting the cool tube with that width is probably not going to be possible if I want to adjust the height of the light.

So, I need to fan the cooltube at least just to blow over the light. A 6 in duct fan will probably work, except it is 6in wide and I will probably have a width issue. So, is there a way to take it apart and bracket it on the cool tube with no metal around it, hack saw off the excess metal and clamp it or another creative suggestion? I've been searching, can't find what I am looking for so .....

My 'cooltube' is a bake-a-round. The fixture that came with my light was too big to allow good air flow. I removed the metal bracket and used this tutorial to get some better air flow. Not sure if this is what you're looking for. My cab is about the same width and I had room. Then again, my fan is not in that same space.

I thought about putting the fan on the outside, but I think the ducting won't be able to bend if I adjust the height of the lights. The cool tube is too long. Because its only 250w, I think I can get away with out ducting it outside the box. Basically, looking for a way to attach a slim fan. I might have to go bake a around style, but that is going to take more time and $

I feel ya...one thing I learned after starting this hobby - everything takes more time and money than I planned...I wonder if there would be a way to mount a fan on the open end of the tube...push air through tube instead of pulling...

you could just put the light at the top and use adjustable shelves in the cab.

Jimbro that is what I am thinking. Just trying to see if anyone has done it or would know how. Rhcp, not sure I could configure that, but it's good thinking nonetheless.

I saw this online. What do you think? Can I just jam this in the open end and push air through. Want to make sure it will fit in there...

http://www.suncourt.com/Inductors.html

http://www.lowes.com/webapp/wcs/stores/servlet/ProductDisplay?langId=-1&storeId=10151&catalogId=10051&cId=SEARCH&productId=3199247&cm_mmc=SCE_gps-_-gps-_-gps-_-SUNCOURT%206%20-%208%20In-Line%20Duct%20Fan%20DB100

That just might work. Obviously, I've never tried it, so I'm just guessing. If you have a lowes nearby it's worth a shot. If it doesn't work, it's easy enough to return it. The cfm's (160, I think) looked good, but the length might still be an issue?

I might try it. It seems like this is supposed to fit inside 6in ducting. That being said, ducting is more flexible than cool tubes so I am worried about the fit. The plan would be to stick it in the cool tube with maybe just an inch hanging out. I could also maybe cut the metal off and somehow bracket it to the cooltube...

sounds like a plan...let us know how it turns out....

This thread has over 2,000 views. I just wanted everyone to know I won't leave this unfinished. My 400w dimmable lumatek/19 in hydrofarm cool tube combo arrived today. My little seedlings are just chillin in the kitchen while I test this thing out.

So far, I have been running it at 250w with a 250w bulb with no fan (about 20 min). There is a small $5 target desk fan blowing on the tube and it is semi warm to the touch and the thermometer is reading 79 degrees at about 6in...so maybe I didn't need a fan. I'm going to lower the tube to 3 in from the thermometer right at the bulb point to push my luck and see what happens.

I did already order the fan, but I have not received a tracking number. So stay tuned. I am growing 2 plants in a cab that is 46in high, 26 in wide and 15in deep. I may be able to step up to a 400w bulb, but I'm not sure that even makes sense since we are dealing with 2 plants in 13 cu feet.

Ran for about another 30 min at 3 in and flipped the super lumens switch. We are now at 90. so we wait for the fan and go back to vegging under cfls.

Stay tuned....

Fan came in today. Would not fit in the cooltube. I put some foam weatherstriping right beneath the blades and wrapped it around the outside, sliding it down a couple inches..as far it let me. It came with a spring which secured it around the top on the outside of the tube. Not very attractive, but the fan blade is about a half in in the tube and blowing across the bulb without the blades hitting the metal. At 3 in from the thermometer, it was 89, at 8in it is 84-85. Some improvement, but need to do some more thinking.

Ever thought of running bare bulb? I used a bake around for several years and very effective, but when I took off the tube I noticed no difference in the amount of heat or yield. my plants stay about two to three inches away from the bulb. I use a 140cfm inline to exhaust cab. cab size is 39x19x19. I see you've constructed something but just a thought.
Edit:
The key is moving the air between the canopy and the light at good speeds.

That's true. I have 2 small fans that I move up and down to blow air on the top of the canopy for a little stem jiggle and to dissipate heat at the top of the canopy from the lights. I haven't factored that in yet. I've thought about barebulbing it, but the tube itself doesn't seem to be getting hot. I can put my hand on it.