First grow with Baby Bloomer and 250 hps in closet.

I read that blowing air out and creating negative pressure in the box is good for the plants. I think that blowing the hot air out may be more effective as well, if the closet is fairly airtight, because you'll be pulling in fresh air at close to the same rate as you're blowing it out.

On the other hand, blowing cool air in, and putting it where you want it sounds pretty good and if you're forcing the hot air out the top...the same principle in reverse.

I'm not sure if one is better than the other. I can say I've read alot about passive intakes.

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Originally Posted by gitarzan

I read that blowing air out and creating negative pressure in the box is good for the plants. I think that blowing the hot air out may be more effective as well, if the closet is fairly airtight, because you'll be pulling in fresh air at close to the same rate as you're blowing it out.

On the other hand, blowing cool air in, and putting it where you want it sounds pretty good and if you're forcing the hot air out the top...the same principle in reverse.

I'm not sure if one is better than the other. I can say I've read alot about passive intakes.

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I think it'd be best to have a fan exhausting air at a higher CFM than the fan used for the intake... if one is used.

One of the positives about having a "negative pressure" inside the grow area is, that when you're flowering, you don't have any "skunky odor smell leaks". If there is a leak in the grow cabinet/area, it will have air sucking IN.

My opinion... :)

-turtle420 :cool:
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I'm also going to try and stick one bubbler under there. I already had most of the stuff(air pumps and stones, buckets, air tubing), so I went to the hydro shop and got 6" net pots and some more hydroton. I also got some of the Hydrofarm ph up and down. Does anyone have any experience with their stuff.

For nutes I have Conucopia Plus "x" and Essential acids. I was thinking of gettin some GH floranova cuase I heard it was simple. I'd like to see if the Cornucopia is as great as the guy who sold it to me said it was.

Thanks for the advice. This place rocks! I think if my exhaust fan is nice and powerful an intake fan will be redundant.

hey sativa I see from your picture you are also using CO². Are you also bringing in fresh air and taking out the exhaust when the co² is running?

Do you run hotter temperatures when the CO² is on?

What timing cycle are you using?

Zero static air pressure is better then negative pressure.

Exhaust should be on a heat controller to only run when the temperature raises above X deg and turn off is the temperature is down.
As for air intake if you use a dryer vent pipe and a can you can make holes so the air exists the back and side of the closet to create a circle of air. The idea of air flow is to exchange the air from the underside of the leafs and gently move the stems around so they gain strength and girth. Thus improving the nutrient uptake for the whole plant.

More nutrient uptake more & larger buds.

Quote:

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Originally Posted by gitarzan

I read that blowing air out and creating negative pressure in the box is good for the plants. I think that blowing the hot air out may be more effective as well, if the closet is fairly airtight, because you'll be pulling in fresh air at close to the same rate as you're blowing it out.

On the other hand, blowing cool air in, and putting it where you want it sounds pretty good and if you're forcing the hot air out the top...the same principle in reverse.

I'm not sure if one is better than the other. I can say I've read alot about passive intakes.

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That's the first time I've heard that, but again it makes sense to me. Negative pressure seems unnatural. I'm definately going to run the exhaust off of a timer. I am going to throw an oscillating fan in there, blowing up at the canopy all the time to give the plants some resistance and promote sturdy stems.

I started clearing out all the stuff from the closet today. I'm a slob. I think this hobby will give me some incentive to be neat and clean. Now here's my new question.

In the room with the closet I sometimes get small moths,beetles and the like(through the front door of my house I think). Should I bomb the room and closet and if so, with what? Or can I just do a good ol fashioned clean up,vacuum and wash the walls of the closet with Mr Clean?

Again, thanks for all the helpful info.

I have some 4 4" airstones,8 1' airstones, a bunch of airhose, 5 5gallon buckets with lids,4 dual airpumps from wallmart pet section, 4 6" netpots and hydroton. Could anyone give me a decent set up idea. I was going to make four seperate bubblers with four seperate airpumps and have an extra bucket for changing stuff.

Am I on the right track?

I'm only going to use two of these as a test against ebb and flow.

Ideas?

Or you can make a DWC setup with those air stones.

Nothing wrong with a good bug bomb if your plants are not in the room. If they are then you need to have the proper bug bomb one that will not harm your plants.

After you bug bomb the room you need to wash down the walls, floor everything. The problem is eggs most cycles are 3-5 day's or more depending on what you are trying to kill. They can come back if you don't deal with eggs.
Just something to think about.