venting in sunhut help anyone

[esc0bar]

my friend has a 4x8 sun hut with two 1000k hps in it. he's got 2 6" vortex's one bringing cold air from outside threw the two sealed reflectors then out into another room. doing that, temps are still around 95. the vortex is first in line and pushes the cold air threw the two reflectors. should it be at the end pulling the air? he doesnt want to have to run a/c but the only way he can get the room cool is to have the vortex sucking hot air from the top of the hut and pushing threw the two lights and out and also having another vortex bringing in cold air from outside (35deg) right into the hut also.

the problem with this is that thewhole point of getting the hut was to have optimal ppm of co2 but since he cant get the hut cooled without bringing out hot air and bringing in new cold air its driving him crazzzyy does anyone have a solution to this? what is he doing wrong any suggestions please help he wants to just have the hut sealed with cool temps and make sure the ppm's of the co2 can get as high as they need to be like the hut is supposed to be able to do with no prob!

esc0bar Reviewed by esc0bar on 10-24-2008. venting in sunhut help anyone my friend has a 4x8 sun hut with two 1000k hps in it. he's got 2 6" vortex's one bringing cold air from outside threw the two sealed reflectors then out into another room. doing that, temps are still around 95. the vortex is first in line and pushes the cold air threw the two reflectors. should it be at the end pulling the air? he doesnt want to have to run a/c but the only way he can get the room cool is to have the vortex sucking hot air from the top of the hut and pushing threw the two Rating: 5

[esc0bar]

anyone there?

[SpaceNeedle]

Well, I will try to answer you. I've owned an heating, ventilating and air conditioning company for about 10 yrs.

First off, if the ambient air that is drawn INTO your tent is 90F, there is no way to do this without using A/C. However, if it is normal room temperature, say 70F, then you should be able to get your inside temp within about 10 degrees of that (around 80F). You have 2 1000W lights that are putting out 6,000 BTUs. A lot of gas fireplace put out 15,000 BTUs, trying to heat a house, and now you have almost half of that in a little tent 4ft by 8ft. I'm just trying to show you what you are up against.

Without using A/C, and assuming your 'cool' air you are bringing in is about 70F, you will need vented lamps. If it was me, I would hook both lights up in tandem, bring in cool fresh air from where ever you can get it, and PUSH it through the lights, and then directly out. By vented lamps, I mean the ones that have the glass pane under the bulb so the hot air is instantly blown out with constant fresh cool air rushing thru it. Then I would put my second fan up as high as I could inside the tent pushing the air up there OUT, since hot air rises.

Then I would put a passive (no fan) air intake near the floor to let fresh air (cool) into your tent. Since its passive, it will need to be about 3x bigger than the size of the hole for your fan. Since you are constantly pushing air OUT of your tent, the passive inlet will just replace the warm air being pushed out. Then place a fan or two inside your tent to move the air around.

None of this, however will do anything to scrub the air. So, depending on your situation, you might want to consider installing a charcoal filter (or scrubber) on your exhaust fan that changes the air inside your tent.

IF you do this, your tent should be about 10 degrees warmer than the air coming in. Good luck!

[esc0bar]

thanks that answered my question almost fully. im going to try exactly what you said. i can bring it cold air from outside (and its winter almost) and push it threw the lights . the reflectors i have are sealed with glass and are made for air ventilation. thats the whole point of the whole system. trying to get co2 levels to the highest. want to get a small in line fan to bring in cold fresh on a timer when teh co2 is off and also i was thinking about putting the vortex that is just sucking the hot air from the top on a timer also to have it shut off when the co2 comes on. what do you think about that? the air im bringing in for the fresh air and also the air to push threw the lights is cold. its nighttime air that ranges from 39 to 49 on average right now and will get colder through the winter. let me knwo what you think. right now there is two vortex's and im decidign which type of cheap fan to get to bring in the cold fresh at the bottom

[SpaceNeedle]

Yea, I think that should work, although I don't have any experience with CO2.

The main thing you should worry about is the difference between lights on and lights off. The most ideal is 75F on and 65F off. In your case you want to watch that there is not too much difference between the two. I would say it should not be more than 10 or 15 degrees difference, or your plants will suffer - they really tend to stretch if there is too much of a difference. And when they put their efforts into stretching they are not producing what we want

sn