400W MH/HPS Ventilation ?s

[skidthrow]

Hi All,

been lurking for around a month, absorbing and spending far too many billable hours on this forum. Thanks to everyone for this wealth of knowledge, i have so many subscribed threads its insane.

So i built my cab (growing area) 28.5"W 20"D 52.5"H (a home depot special) and i'm running some proactive tuning tests and lightproofing.

I'm running a 400W MH conv. bulb w/ a cooltube which is far too hot. high 80s - low 90's on 24/0 after a day or two.

my question is this:
i got an inductor fan 250CFM. should i leave one side of the light non ducted so it pulls some of the ambient air in? or should i pipe in outside air and out the cooltube and get some additional fans for the ambient air. i have 2 2" passive intakes on the bottom left and right.

not too much space to work w/ on the left


or the right


2" passive intake 1 of 2. w/ light leak


cab - i know i should take the ballast out. right?



is it 5 posts b4 i get images?

thanks everyone!

b

skidthrow Reviewed by skidthrow on 10-04-2007. 400W MH/HPS Ventilation ?s Hi All, been lurking for around a month, absorbing and spending far too many billable hours on this forum. Thanks to everyone for this wealth of knowledge, i have so many subscribed threads its insane. So i built my cab (growing area) 28.5"W 20"D 52.5"H (a home depot special) and i'm running some proactive tuning tests and lightproofing. I'm running a 400W MH conv. bulb w/ a cooltube which is far too hot. high 80s - low 90's on 24/0 after a day or two. my question is this: i Rating: 5

[texas grass]

paint the inside of your passive intake holes flat black and add 1 more 90 or 45 to it, and prob want atleast 2 more passive intakes

you are goin to need more than an inductor/booster fan, should get a good quality inline fan or a squirl cage fan. and to hook it up i would cut a hole in side of cab(no room to get flex tubing in there) and run the fan outside the box and on the other side of the cooltube i would leave open. put a carbon filter on fan and you should be set

[skidthrow]

excellent. thanks for the insight.

was eying the vortex, i guess i just needed to hear it.

is 2" sufficient for the other intakes, or should i go larger?
or
instead of 2 more passive should i just use my inductor to intake?

thanks,

[texas grass]

either go with 2 more 2" intakes
but since you have the inductor i would use that

[Opie Yutts]

I would make the intake and exhuast 4", and pull air out one side of your light to exhaust your closet. Definately take the ballast out if at all possible.

[rhizome]

No way I'm gonna type this out again-

http://boards.cannabis.com/indoor-gr...ml#post1634834

[Opie Yutts]

Oh I'm sure you will type it again. Maybe you should get an additional clipboard program so you can just leave it there, ready to paste at a moments notice.

I think noobs tend to look at that guide and say Holy Crap, That's so long and has so many big words, and I just don't want to put forth the effort required to understand that whole thing when my question is probably just 1 tiny part of it somewhere.

I don't want to learn, I just want my immeadiate question answered so I can get on with my next rickety-ass section of my grow.

Please people I am not pointing the finger anywhere. By the way rhizome, awsome guide.