** Will this work?? Come quick, order on the way! **

[InTheTrees]

Im growing in a homebox xs (2x2x4) and im growing buddha white dwarfs (From ) they will be under a 250w hps with a cooltube (from htpsupply?).. Well what im asking is would 1x intake 6'' inline fan pushing 250 CFM (cubic feet per minute), and i have 1x of the same 6'' fans on the cooltube.. Will another 6'' fan of the same one work?? Or would i need more?? Here is the specs of the fan.. And will i need 2x fans for my cooltube (One sucking in and out) or what??

PLEASE HELP ME!

Heres specs of fan:


250 CFM (cubic feet per minute)
Fluted for easy installation
Powerful enough for 1 Reflector or Long Runs
Comes Completely Wired Ready To Go
Fits all 6" A/C Fittings & Ducts
Keeps your bulbs cooler
Reduces Bulb Fade & Extends Bulb Life
Remove the #1 Heat Source from your grow area
1 YEAR FACTORY WARRANTY

The SunCourt Duct Booster Fan can be used for Ventilation or Reflector Cooling. Keeping your grow room when ventilated and temperature controlled is very important. Removing the heat from you reflector hood is also important. By adding a fan, Bulb Life is Extended, Bulb Fade is Reduced and reflectors can be placed closer to your plants. Comes with a 1yr Warranty Sun Light Supply.

[stinkyattic]

That's a nice big fan that will still serve you well in a larger room.
You only need one, and it should be set up at the exhaust end to suck air throuhg the whole thing.
Now remember, unless you are running 2 fans (one light cooling system and one room cooling system, totally seperate ducts), you leave one end of the hood open to the room so that the exhaust goes out through the cooltube.

[InTheTrees]

Thanks for the reply, i see you in alot of posts and you are really helpful!

So i should have a total of 3x Fans? (One for Cooltube at ehaust, A room exahust, and an intake fan) I will also have a fan in the room running.

So I leave the intake part of the exhaust open and put the fan at the very end of the exhaust?

And also, i got a T shape 6'' Duct can i use that instead of running 2x ducts? If so how should i do it running it out of the top.

[stinkyattic]

just seriously run the one fan and one exhaust, thoruhg your cooltube in the order:
open-cooltube-duct-exhaust fan pointing OUT- carbon filter. you got it right.

don't worry about getting fancy; just run the exhaust 24/0 and use it for not only cooling, but also fresh air.

The homeboxes have a little intake-flappy thingy down at the bottom that works fine for passive intake.

[killerweed420]

I use a 6" 250cfm fan on my enclosed hood and seems to work good. I have mine set to blow cool intake air on the lights. Then I use a fan for blowing cool fresh air into the room. Should be fine without an exhaust vent unless heat becomes an issue.

[InTheTrees]

So 2 fans (One for intake, and one Exhaust/cooltube) will be all i'll need? I won't need another exhaust unless heat becomes more of a problem right? And i can use the fan for both intake and exhaust?

Thanks for your advice guys!! I can't explain how much your help is appreciated!

[joedirte]

nicely done. thats a 250? ina 2x2x4? anyway, looks clean.

[killerweed420]

So 2 fans (One for intake, and one Exhaust/cooltube) will be all i'll need? I won't need another exhaust unless heat becomes more of a problem right? And i can use the fan for both intake and exhaust?

Thanks for your advice guys!! I can't explain how much your help is appreciated!
Yeah you should be good. Walmart has a handy little digital humidity and temp meter that records the last 24hrs of humidity and temp. Its only like 8 bucks. That way you can tell what kind of a range your getting.

[joedirte]

i use 4 inch CPU fans for intake. theyre rated anywhere form 70, 100 cfm. i you use one of these, your intake inlet can be just as big or smaller that your exhaust (dosent have to be 2-3x as big like with a passive intake.) you can find pre wired ones at buyextras.com and they cost about $20

you want to exhaust more air than you bring in to create a littel negative air pressure. this way, the stink stays inside.:rastasmoke:

[joedirte]

oh. get a good inline fan (vortex) that can take the heat and long hours so you can place if after your hood (sucking hot air out rather than pushing cool air in.) this creates more negative air pressure and draws out more heat.

[ledsled96]

I'm a total noob but here is what I have, 36?x20?x64? grow tent with an htg 250w hps with cool tube hood. I have one 6" high output fan for intake into the tent, One 4" inline fan sucking air through the cool tube and one 4" inline for overall exhaust and both of these t'd into a filter. I run between 76 and 79 degrees all day long with the room temp at 69-70 degrees. I have seen excellerated growth since switching to hps and the exhaust upgrade as compared to my 2ft 6 lamp 3veg and 3 growth bulbs and just the 4" inline fans. I hope this helps.

[InTheTrees]

oh. get a good inline fan (vortex) that can take the heat and long hours so you can place if after your hood (sucking hot air out rather than pushing cool air in.) this creates more negative air pressure and draws out more heat.

So my 2 fans won't cut it? I'd hate to spend more money if mine will work. Or do i only need 1 fan?

But anyways, man you guys are awesome! :thumbsup: I love this site, and i have posted on another board, and got no where near the ammount of results as this thread. As soon as my seeds/fans get here, you all will hopefully be helping me out on my very first grow!:rastasmoke: (Just so you know you guys are doing a good job, i got most of my information from here, rather then other sites.. Maybe thats the reason i registered here first :thumbsup:)

@ledsled96:
Where do you have your fans placed in your T?

[joedirte]

no no. i think your 250 cfm fan would work fine for probably 2 hoods ( but no filter,) or 1 hood and 1 filter. then you could just use a smaller inline fan (like a muffin/cpu fan) or even a passive intake (as long as you have negative air pressure). a passive intake is with no fan, just a big hole to draw in air.

[InTheTrees]

no no. i think your 250 cfm fan would work fine for probably 2 hoods ( but no filter,) or 1 hood and 1 filter. then you could just use a smaller inline fan (like a muffin/cpu fan) or even a passive intake (as long as you have negative air pressure). a passive intake is with no fan, just a big hole to draw in air.

Oh ok!! but i've already ordered 2x of those fans, so i waisted my money on 1? I absolutely can't use both of those fans for in/out/cooltube, even if some smell does escape? Thanks for the help Joe, i really am grateful! :rastasmoke:

[joedirte]

honestly, with my 400 watt (in a 2x5x5 closet) i can get away with using a 4" 170 cfm fan for ventilating my hood, and it creates enough air exchange to keep the plants happy. i think you'll be fine with one. and if you find that you dont need the other fan, you can always expand (get more lights, bigger space,) or return it. itll work out. btw, where do you order your fans from? i usually get everything from hydroponics.net

[InTheTrees]

Ok, and you use a passive intake?

And i got my fans from a ebay store.

Heres link to fan i got
6" INLINE AIR COOL REFLECTOR DUCT BOOSTER FAN VENT HEAT - eBay (item 200239804017 end time Jul-24-08 10:15:37 PDT) (http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWAX:IT&item=200239804017)

Thanks for the help, hopefully you'll see my grow log starting soon!

[joedirte]

your 250 cfm fan should be more than enough (a good thing when cooling lights.)

i use a 4" 100 cfm fan(s) for intake. theyre pretty weak but i notice my temps go down.

[InTheTrees]

your 250 cfm fan should be more than enough (a good thing when cooling lights.)

i use a 4" 100 cfm fan(s) for intake. theyre pretty weak but i notice my temps go down.

Oh, so i could get away with a passive intake?? Man im excited!!

[InTheTrees]

How do you like my new avator? and i put some words in my sig.. Jim Morrison is the man!:thumbsup:

[stinkyattic]

Unless your intake and exhaust fans are EXACTLY matched, and you have a cOMPELLING reason to run both- whic you don't have- Waste of $$$$.

You're running a 250 in a very small space. One good quality 200+cfm fan is all you should need, with an air coolable hood and a passive intake.

[khronik]

I have a 400 watt light in my attic, and I use a 50 cfm bathroom exhaust fan. I know most people here will say that's terribly inadequate, but I've had three successful grows, so it can't be too bad. Granted, it does get pretty hot in there, but the light is off during the day when it's really hot. I could probably get better yields if I controlled the temperature better, but I'm content with the yields I get.

[anbesol]

I grow with a homebox XS now as well. I have a 4" small duct going to the bottom for intake and then i vent out with with the back wall carbonfilter 4" to a reducer of 3" out to the 4" fan exhaust. no need to have 2 fans! putting fans in will cancel them selves out and you wont have a negative air effect in your tent which helps with airflow. Good Luck! check out some of my old posts. you can see the tent.

[InTheTrees]

Man you guys are fucking awesome! I LOVE THIS SITE!!

I can't wait till the grow starts!

Thanks sooo much for your alls knowledge!