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

[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)

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.