Ventilation Duct Fan For COOLTUBE Question

I'm hoping to use it to make a cooltube for a 400w HPS, alternatively a 250HPS.
Will this do?

These are the specs:
TD 160/100.
2 speed: 2500/2100 v/min.
Effect 35/23 W.
Decibel 39/35 dB(A).
Max. air: 160 m³/tim.

Pic:

: Duct Fan

The opening on either end of the cool tube is 6 or 8 inch.If your asking what type of flex to use you can just use the 6 or 8 inch flex.I would put a 6x4 reducer on the ends and use the smaller fan.I hope I understood you correctly.

Ga Grown!

No, I mean if the fan is powerful enough. The cool tubes are around 9cm, but they're not a standard size since thwey come from second hand hurricane lamps, so will have to insulate a bit where they join the flex and fan.

Max. air: 160 m³/h.

There are 2 FAQ's on making a cool tube have you checked it out yet?

http://boards.cannabis.com/grow-faqs...cool-tube.html

http://boards.cannabis.com/grow-faqs...cool-tube.html

Oh yeah, Ive checked them. technical specs make my head dizzy though...
Btw, I just finished banging an exhaust hole in my wall. Quick spliff break and then its back to banging up an intake hole...my landlord is gonna love me.

160 cfm,your room is 3mx3mx3m? You should use a 265 cfm fan!

Ga Grown!

No, my room is about 1.3m * 1.8M, though about 4m high. But this fan is going straight into a tube though...Unles I don't need to, of course.

yes! It needs to be hooked straight to the fan.Get a seperate fan to vent the room and bring in fresh air.The fan hooked to the cooltube will draw the heat out.Are you gonna use a timer or a thermostat for the fan on the cooltube?

Ga Grown!

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Lol, yes but will my fan Max. air: 160 m³/h be powerful enough for a 400w HPS? Do I need it on a timer? I guess time will show, I thought it would run as long as the bulb does...?

for a 400 watt cooltube you want a minimum of about 465cfm to properly cool the bulb. i'm not sure watt 465cfm converts to in metric, sorry. i had a 400hps cooltube with only 4inch duct booster and it wasn't so good but i upgraded to a 465 squirrellcage fan going by specs on the cooltube package and it was 100x better. with the 465cfm 400hps cooltube i could keep the temps in the closet the same as the ambient temp in my house at all times!

It powerful enough to do the task! Just hook it to the timer with the light and let it come on with the light and go off with the light!

Ga Grown!

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You think so? Here's the kit I bought today:
SL TD160 In Line Fan Kit

Will that do?

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Air Movement
Speed 1
160m3/hr - 2500rpm - 35watts

Speed 2
130m3/hr< - 2100rpm - 23watts

if i did the calculation rght the fan you got is about 91cfm at the high speed. that is about the same as the fan i 1st tried to use with my 400hps before i upgraded. as i said it works but not as good as a cooltube should with a more powerful fan on it. i got through a grow with it without problem before i upgraded. this is what i upgraded to it's only 15bucks more than the 1 you linked. Ecoplus 465 CFM Industrial Grade Blower - Plantlighting Hydroponics

i just noticed that your in denmark, i guess the prices on your link weren't in us dollars so the price of the fan i linked is 80us dollars and the one you linked is 64euros i guess, i don't know what you guys use for cash over thee or what it equals in us dollars, please forgive my ignorance, i'm just a stupid american unfortunately, lol.

OK, thanks. How well will it work if I just want to vent the room? No cooltube?

If your gonna vent the space your using then a 265 or a 465 will work best for you! If you are gonna vent the tube? Then have it blowing ant the mogul end and exiting via a duct.The shorter the better!If it's flex then pull it tight! Less restriction that way.I use a 265 and a tempstat by my light hood and it only runs for about 5 mins. tops! I have a fairly large space,too! I'm about to post a pic for ya!

Ga Grown!

Here are a couple of pics.

Ga Grown!

Cool thanks. I should mention I also have one of these sucking in cool air at the bottom, its either 60 or 90m³/h

FAN.........

Btw, both holes are done and puttied. Drying till tomorrow, fresh coat of matte white tomorrow for the next grow ;)

All you need is an entrance for air! Don't really need a fan blowing in as long as you have a fan blowing air about the room!It'll save ya some on the electricity bill.

Ga Grown!

Hmmm. Then maybe I could use the smaller fan for a cooltube for my 250HPS...
I want to use both preferably and have 650W HPS for flowering.

just for comparison i will tell you what happened to temps in my space when i went from a nonaircooled hood to a 80cfm cooltube then to a 465cfm cooltube. my space was 4ft wide by 2ft deep by about 6.5ft tall. i had a 400hps non aircooled hood, for ventillation i had 2 180cfm exhaust fans at the top and at the bottom a 10inch vent hole with a 10 inch box fan sucking air in. temps were between 79-83 with lights on and i could get the bulb to about 16inches above the canopy. i changed the nonaircooled hood to a cooltube with a 4inch, 80cfm duct fan on it and all the same ventillation in the room. the temps never went over 80 and i could keep the bulb 12inches above the canopy. next i changed the 4inch duct fan on the cooltube to a 465cfm squirrell cage fan and also i got rid of 1 of the 180cfm exhaust fans. once i did this final upgrade the temps were always the same as the ambient temps in my home and i assume i could move the bulb even closer but i need it at least 12inches above the canopy so the light can reach both ends of the closet.
that might help you out a bit to get an idea of which ventillation method would work best for you. good luck.

Ok, thanks for that info, very helpful. I've hung the stuff up temporarily with a 250HPS going, don't want to have to re-spackle and paint because something was wrong. Temps after ½ hour with door closed: 22C.
That seems very promising. Now I'm going to see what happens when I stuff 650 watts of HPS in there....Exciting stuff...

Oh screw it. I ended up at 35C immediately. Im returning the fan tomorrow, and getting this instead:

*TD 350/125.
*125 mm.
*50W.
*Decibel 48/39 dB(A).
*Max. air 370 m³/hour.
*Diam. 155 mm.
*Length 290 mm.
*230 V.

Thats more than twice the power.
Might as well do this properly.
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as i said before you need a pretty powerful fan to run a cooltube properly, the best choice would be a centrifugal fan like a vortex inline and the second best choice would be a squirrellcage fan like the dayton blowers. the standard duct booster fans just aren't powerfull enough to push enough air over the bulb. the fan you just posted the specs for is still only about 215cfm which is less than half as powerful as the 1 i used for my 400hps cooltube. do a search for ecoplus or dayton blowers, you could probably find a 465cfm one for 60-70 dollars american shipped. my philosophy is always to try to get the best equipment possible so that way when your space is set up you can focus your efforts on growing the plants and not finding ways to get the temps down, humidity up, better air circulation, etc. you can learn from my mistakes as well as others here so you don't have to make them yourself. i wish someone would have told me to get a more powerfull fan when i was 1st building my cooltube, it would have saved me alot of time and money.

Thanks for the tips. I bought the bigger fan anyway, my plan is for that to vent the room with a 250w during first weeks of veg (they're still stuck in tiny plastic cups under some flours and not too happy about it). I'm thinking I'll easily keep general house temps with that. The other fan was less than half of this, and when I tried it with the 250HPS for half an hour with the door shut, it only reached 23C.
During that time I'll prepare the 400w with a cooltube, and add that after a few weeks as needed, and especially for flowering.
I'm hoping that will work.
I also plastered, sandpapered and painted the room with a whole new coat of matte white after making those whacking great holes in the wall, and did the hallway at the same time

Heh, this new fan is a pretty hefty toy, though ;) VROOOOOOOOOOOM!!!!!!!

good luck, i hope it all works out as planned, you seem to have done your homework.