Ventilation question

You need the carbon filter for smell. Put it inside the tent, and SUCK air into it. That gets ducted to your light hood, then to the fan, then pushed out into the attic.

I would recommend at least 250 cfm for this job.

Fresh air can come from the house. This isn't optimum, but it will work well enough. The 400 watt bulb shouldn't be too much of a problem, I would go with 600 if you can. Digital Ballasts are much cooler than magnetic.

You need BOTH a carbon filter (Can66) and an air-cooled hood (Cool Sun). Run them both through 1 large inline fan. If you have to cool the room, use a window AC or get a 55gal barrel and a small chiller to run an Ice Box. The Ice Box will be cheaper on the power bill than the AC.

If you add Co2, you could split the light/exhaust lines into two and run a closed loop system. This adds a good 1k to the setup cost, but 30% bigger buds.

Originally Posted by smokingrubber

You need the carbon filter for smell. Put it inside the tent, and SUCK air into it. That gets ducted to your light hood, then to the fan, then pushed out into the attic.

I would recommend at least 250 cfm for this job.

Fresh air can come from the house. This isn't optimum, but it will work well enough. The 400 watt bulb shouldn't be too much of a problem, I would go with 600 if you can. Digital Ballasts are much cooler than magnetic.

You need BOTH a carbon filter (Can66) and an air-cooled hood (Cool Sun). Run them both through 1 large inline fan. If you have to cool the room, use a window AC or get a 55gal barrel and a small chiller to run an Ice Box. The Ice Box will be cheaper on the power bill than the AC.

If you add Co2, you could split the light/exhaust lines into two and run a closed loop system. This adds a good 1k to the setup cost, but 30% bigger buds.

So if i get this right this is what i will do according to you:

Cooltube >> FAN >> tent outlet >> Carbon filter (like a chimney on the tent or ducted top right as far as i can get in the room where the T-vent opens to the house ventilation.

Then buy a second fan to mount on the T-vent opening to suck it all out of the house.

Sounds good to me if thats your idea.

my plan was to keep it cheap and only the essentials included. So preferably ill stick with the 400w idea to avoid any unpleasant suprices. Last time i grew we went in a much smaller room without any good ventilation and 600w hps..ended up with peaking 36 celcius/96,8f at first, had to rent a car and go pick up a 300$ used AC unit which at best kept heat somewhat around 27-30 at bud lvl :P.

I am not risking it again and i rather play it safe and learn to be a better grower then i was before and increase yield by that...oh wait i was a learning noob so it wont be too hard. Then i used soil without proper nutes, had heat problems so i'm pretty sure doing it better with proper nutes, hydro, premium heat conditions and fresher air will be a huge step forward even though i got 200w less...and that crop was done with a sonlight AGRO (mix) bulb. This i will do with with MH and HPS.

OFC i will use digital ballasts, the stuff i have to buy i won't go über budget on.

I dont have anything of the old stuff left left bcuz i payed the 2000w power bill by giving my grow partner my share of the ownership of all the stuff so im starting from scratch. was lamp, humidifier, 1000w ac, table fan, pc power supply, 2x120mm fans.

i know i didnt plan it out like u said, but if i have carbon filtering in the tent just rotating air and at the same time sucking it out through a second system, won't it filter it less than if i have the only outlet on the tent filtered before blowing it out into the room and then sucking it out of the room ? or dou think your 50/50 idea will filter it enough while just circulating it and blow all the concentrated hot tent air right into the outdoor ducting like u said. I'm pretty sure im not sharing the duct with anyone else since i live alone top floor but it might blow back a litle into my shower ventilation but that not a problem as long as its filtered from smell more or less i can just open the bathroom door after taking a shower ^^

Both ideas sounds neat to me and i have to buy the same stuff using either venting design, i guess the decision come down to smell vs. heat and if my idea can handle the heat and if yours can handle the smell.

Hopefully both would work but i'd like to make sure instead of doing allot of setup work in vein and being forced to redo it stressed as hell while growing.

Originally Posted by 420 swede

So if i get this right this is what i will do according to you:

Cooltube >> FAN >> tent outlet >> Carbon filter (like a chimney on the tent or ducted top right as far as i can get in the room where the T-vent opens to the house ventilation.

Then buy a second fan to mount on the T-vent opening to suck it all out of the house.

NO

Carbon Filter --> Cool Hood (not tube cuz they suk) ---> tent outlet ---> fan ---> Attic or outside the house.

Basically, you'll have 1 fan sucking air from inside the tent, through the filter and the hood, and exhausting it outside of the house.

If you don't exhaust to fresh air then the used air will get pulled straight back to the tent. Unless you're suppling extra Co2 that would be all bad. Exhausting it outside forces fresh air to be drawn in, naturally replenishing your Co2 for you.

Originally Posted by smokingrubber

NO

Carbon Filter --> Cool Hood (not tube cuz they suk) ---> tent outlet ---> fan ---> Attic or outside the house.

Basically, you'll have 1 fan sucking air from inside the tent, through the filter and the hood, and exhausting it outside of the house.

If you don't exhaust to fresh air then the used air will get pulled straight back to the tent. Unless you're suppling extra Co2 that would be all bad. Exhausting it outside forces fresh air to be drawn in, naturally replenishing your Co2 for you.

Aaaah lol, thats fucking brilliant i got so cought up in my own thinking i became retarded ^^...thats the way to go man =)..thank god there is other ppl with a working brain or i'd be fucked

Thanks allot mate.


Any idea about how much air u can push through a tight duct such as 10cm (4 inches) before making too much noice? i'd have no problem going 12,5cm(4,92 inches) on the entire system and then convert it to 10cm at the T-duct outlet as long as it doesnt end up in some messy whistling contest in the ventilation system.

edit: are these (http://hydroponics.eu/cat.asp?catego...Extractor+Fans) fans overpriced crap or is it pretty much what u where thinking of, its the only good site i know that i made purcheses from before.

Originally Posted by 420 swede

Aaaah lol, thats fucking brilliant i got so cought up in my own thinking i became retarded ^^...thats the way to go man =)..thank god there is other ppl with a working brain or i'd be fucked

Thanks allot mate.


Any idea about how much air u can push through a tight duct such as 10cm (4 inches) before making too much noice? i'd have no problem going 12,5cm(4,92 inches) on the entire system and then convert it to 10cm at the T-duct outlet as long as it doesnt end up in some messy whistling contest in the ventilation system.

edit: are these (http://hydroponics.eu/cat.asp?catego...Extractor+Fans) fans overpriced crap or is it pretty much what u where thinking of, its the only good site i know that i made purcheses from before.

4" vent hose kinda sucks because it colapses a bit and 4" ID is really 3" ID. You gotta do what you gotta do, but it would be better if you could exhaust UP into the attic.

Originally Posted by smokingrubber

4" vent hose kinda sucks because it colapses a bit and 4" ID is really 3" ID. You gotta do what you gotta do, but it would be better if you could exhaust UP into the attic.

I know but the 4ID allrdy is built into the house right now, would save me from allot of trouble + im renting 2 hand from my dad right now so i'd rather not have a gigantic duct right up into the middle of nowhere, allso i have no idea how the roof is up there, i live in a apartment as stated earlier, at worst i'd end up into a sea of insulation, cut some kind of cables and cause ireversable damage to property of a family member of mine, at best i'll have bought in 50/50 into this rather expensive apartment when i have bought my stuff and started growing. maybe ill do it when i come up with the rest of the money :P..like another 25000-30000$ in swedish currancy ^_^

Anyway, thanks for setting my mind straight about what order to do the ventilation in, hopefully it will turn out acceptable in the end with the stuff i got to work with.

Anyone here know a good sealed reflector for around max 100€ which has somewhat between 10-15cm air in and outlet.
Been looking at the cooltube and i see only a sure opening from one side and i guess its just slotted on the side the E40 socket sits on. Need a goodie that i can travel air straight through and not one that just makes the air blow free after cooling the lamp.