4x4 grow tent with 600w hps, How should I ventilate?

Originally Posted by LRGenius420

I have a 4x4x6.5 grow tent, and a 600w 6"a/c XtraSun with 120v lumatek ballast,
I am trying to figure the best way to ventilate my tent efficiently. I want to keep light as cool as possible to keep as close to plants as possible. How many fans will I need, were should i place fans, etc. ??????

Im no pro so i cant promise this works as good for a 600w but it should. Everyone ive heard from says it would work just fine http://www.hydroponics-hydroponics.c...lation-kit.cfm

I have same question.. same setup in Growlab 120 same Lumatech Digital ballast mine is dimmable.. 600 watt maximum.. looking at around $150 on ebay for 4inch and $200 -250 for 6 inch.. both with carbon filter.. I wanna be cheap and get the 4 inch but my brain says get the 6 inch... 8 would pry be overkill according to the formula too.. 1/2 cfm per the total wattage... 600 watts need around 300 cfm.. but I wanna know if around 200 or so cfm would work well enough which is what you'll get outta a 4inch fan

I have an idea of the equipment i need, i just need to know the best way to ventilate the light and room together with the least amount of fans

I use a 6" fan to vent and cool my light with basically an identical setup. If you're worried about it being too big, you can always use a fan controller. I believe its always better to have too much ventilation than not enough.

And if you're going through a carbon scrubber, you definitely want the bigger fan.

good input I appreciate it, where should i put the fan? Ive seen some people put the their incline fan on the end of there can filter, or ive seen them put it outside. does the air go through the can filter than the light than out of the tent all in one line, than my intake is somewhere near the bottom correct?

or is there some way I can elimate the cost of an extra fan for intake at the bottom out take.

No need for an intake fan. You really want negative air pressure inside the tent to keep the stink contained inside. A single 6" fan will be plenty to ventilate the light and tent.

I run my ventilation like this:
Carbon Filter --> Fan --> Hood --> Exhaust

As long as you are pulling air through the carbon filter, it doesn't really matter if the fan is pulling or pushing air through the hood.

yeah im building the same setup .. 4x4 flower room possably a slightly longer veg room alongside if i can afford it ..
you realy think no intake? i was thinking of just putting a few small holes down by the floor around the walls .. just so the air can be pulle dover the leaves and up to the exit fan ...
where do you have your filtered air pumped?
i might have to build my exit fan into a box and fit that into an open window.. cant be making holes in my place..

Oh .. and how many plants do you grow in there .. with out it being crowded.. im thinking 9 - 12

Originally Posted by Day to Daze

yeah im building the same setup .. 4x4 flower room possably a slightly longer veg room alongside if i can afford it ..
you realy think no intake? i was thinking of just putting a few small holes down by the floor around the walls .. just so the air can be pulle dover the leaves and up to the exit fan ...
where do you have your filtered air pumped?
i might have to build my exit fan into a box and fit that into an open window.. cant be making holes in my place..

Oh .. and how many plants do you grow in there .. with out it being crowded.. im thinking 9 - 12

Yeah, you want a passive intake like you are thinking. An intake fan is completely unnecessary.

The vented air is pumped into my bedroom where the tent stands. I would vent it outside since the window is right next to it but it is at ground level and people walk by, so it is a security issue. At least it keeps the house toasty in the winter.

Number of plants depends on your growing style and how big you plan on letting them get.