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So when you build vents, whether it's for a grow room, or a whole building, theres a whole scientific theory behind whether the intake or the exhaust should be more powerful, vacuum and all that stuff.
I seem to remember that the exhaust should be more powerful than the intake, can anyone confirm or refute please? I've googled like mad, but I just can't find any good answers and it's time to get building a proper space...
I'd be really greateful for any help. Thanks! :pimp:
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...ideally..you want it about the same...good air in ..bad air out...as close to neutral as possible..it's not a wind tunnel...LOL...
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Heh, well perhaps not a wind tunnel, but if I'm going to stick 1 000 w in a wardrobe, I suspect I need to put quite a bit of work into getting the vent right.
I bought a restaurant 2 years ago and had it rebuilt. We fought a daily battle with the ventilation system because the air pressure was wrongly balanced, either the exhaust or the inlet was disproportionate, can't remember which, which made the whole system innefficient, not because one or the other was too weak, but because the balance was out of whack. So I suspect i should be learning from that lesson for this closet?
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i think its supposed to be slightly negative, so your sucking out more than your pumping in.
i guess the best way to do it would be to use adjustable fans, so you could turn them up/down and experiment
found this site...dunno if its any help
http://www.engineeringtoolbox.com/de...ems-d_121.html
also,
a friend of mine is actually doing an HND in air-con/refrigeration engineering....is surprising how much complex maths is involved in this kind of stuff....if i see him soon ill ask if he knows any easey to understand online resorces, as im sure a lot will be benificial to growers.
...I used a 400HPS light in my closet....cool air from the A/C..blowing in from the bottom...exhaust..going out the top....with a digtal temperature/humidity gauge...somewhere between the lights and top of the plants (not directly in the light)...I hear 1000HPS ..gets seriously hot....test everything....before you pop the seeds...
well if you want all the air to go through a filter you would need a negetive pressure (exaust stronger)
If there is a positive pressure then air will leak out any holes. this will allow smell to escape. It's not a problem for me, but maybe for you.
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Thanks, yes, I suspected the exhaust needs to be stronger. The smell isn't the main concern, it's moving the hot air out that I want to concentrate on.
I learned during our rebuilding that there is a whole complicated architectural science behind it, so that would be great babystarbud, if you meet him ;)
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a great option is a cool tube. They work amazingly well.
a buddy of mine has a 1000W hps. He has a 165cfm fan going though a cool tube, which removes a hell of a lot of heat (its the only exhaust). and then a small 90cfm fan as intake. and his temps are fine.
without a cool tube your going to need to buy a bigger fan, which can cost a lot. as well, cool tubes still work well when the intake air is at a higher temp. So if the room your wardrobe is in gets warm, in summer or w/e, a normal set up wont do you much good. it'll get hot inside the grow room. (happens to me). With the cool tube it will remove practically the same amount of heat no matter what the intake temp is.
This is because the bulb is like 1500 degrees F. so a change from 70 to 85 F dosn't make too much difference.
i agree w/ harris 7 that a cool tube is your best bet. 1000w in that kind of space demands serious heat control, and a cool tube can give you that