The 4x4 Grow Tent Club

yeah exactly.

[Passive Intakes] -> Tent -> {Scrubber -> Fan + Cooltube -> Exhaust} -> [Room]

i have a 6" line coming in from the window to cool things down 5-6F

I figure the vents on the side will pull in fresh air from the suction the exhaust makes.
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yeah, this is how i've seen most tents run so far.

I COULD rig an intake fan to get more cool air into the tent too but I'm afraid it will just make the hot air blow out the sides of the tent instead of through my exhaust to the chimney.
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I don't think active intake would be necessary, but if you put an intake fan, I'm pretty sure that as long as your exhaust CFM is greater than the combined tent volume AND your input CFM (i.e., 100cu/ft + 20CFM input = 120CFM) then you should retain negative pressure.. more air out than in.

someone feel free to correct me if thats not accurate; just speculating :)
 
My tent has a weird set of intakes. From the top left corner, an angled vent sleeve comes in from the ceiling near the back wall, and another vent sleeve comes in from the back wall just behind this. Then on the left wall near the front there is a vent sleeve on the bottom.

I planned to do...

Filter>Ducting>Cool tube>Ducting out of tent>Fan>Ducting to Furnace vent>Chimney

I will hang the filter off the left hand side of the tent, length going front to back, and have the cool tube mounted in the center, thus the ducting needed between. Then the fan I wanted to sit outside the tent between it and the furnace vent.

That way my heated air goes up through the chimney and outside rather than heating my room, and scrubbed of scent just for discretionary sake--dunno if the scent would leak through the crawl space or whatever.

The furnace vent is probably four or five feet away from the tent so if I put the fan somewhere in between I hope to get the right amount of exhaust out of the tent, and then let physics handle the heated air and direct it up through the chimney.

I had been thinking about sealing the vent flaps down and running an intake fan at the bottom with a hepa filter or something to help keep dust/dirt/cat hair/bugs out of the grow area too.
 
oh yeah that does sound kinda odd.. mainly you want your cool intake at the bottom and your exhaust at the top to pull the cool air up as the hot air is removed.

may depend on what kind of fan you're using.

lots of people use external fans, so its definitely feasible, but i've only seen it done with the vortex style fans with high CFM (~400)

my fan is only 160CFM in my 104cu/ft tent so theres a few reasons i put my fan between the filter and the light: to make sure it was pulling as hard as possible through the carbon filter, to make sure it was blowing as hard as possible over the light, and to make sure it was pulling through as little ducting as possible; To maximize the effectiveness of exchange, scrubbing and cooling functions.

dunno if the scent would leak through the crawl space or whatever.
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totally depends on how much skunk you got and if the whole run is sealed.

I had been thinking about sealing the vent flaps down and running an intake fan at the bottom with a hepa filter or something to help keep dust/dirt/cat hair/bugs out of the grow area too.
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yeah for sure, i taped a chunk of heater filter onto my outdoor intake for that same purpose.
 
Thought I would show you guys my 4x4 grow tent set up.
4x4 mars hydro tent
6in grow one inline fan
6 in Thunder sun max air cooled hood
600 watt solistek ballast
600 watt Hortilux super HPS
6in x 16in BlackOps Carbon

12x 3 gallon pots (happy frog/ coco coir)

Strains
6x Gorilla Glue #4
6x Fire OG

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I just joined this site I don't have one up yet but gonna start making them for each run starting with this one even though I'm already 12 days in flower and gonna start another journal from cutting clones all the way till harvest.
 
Gillettfusion said:
I also have a 18 in oscillating fan inside the tent and I use Blue Planets Farmers Pride full line up along with advance nutrients overdrive
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Nice set up you have there, and great looking greenery! :thumb:

One question... Where do you put the fan? That's a pretty big fan, and the tent looks pretty full as it it.
 
Here's some better pis of the oscillating fan I do lower it abit just to get good air movement in and threw the top part of the canopy especially when they all start to dense up.
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In my experience the only way I have success growing a thick dense canopy from corner to corner in the tent without having any problems is good air flow so I do go a little over kill. I use the grow one 6 in 435 cfm inline duct fan to cool my hood but also pull cool fresh air threw the bottom two 6 in duct port of the tent up and threw the canopy while the 18in oscillating fan blows threw the top part of the canopy
 
Are those inline fans very heavy? Haven't thought about how to hang mine yet.

I am really wanting to try a no mercy grow from seed. 12/12 all the way through. If I can get close to an ounce a plant that would be good since I have a plant and weight limits.

Sucks waiting, I have 500 watts of CFL right now. Just no ventilation, and only bagseed.I am saving up for proper lights and vents and then maybe I'll experiment with bag seed before ordering pricey genetics.
 
My 6in Grow one inline fan weighs about 12lbs. most inline fans do come with mounting brackets but from my experiments if you use straps and a heavy duty ceiling hook instead of the brackets it comes with it is quieter and no vibration in the ceiling or walls. Keep in mind I do run it at full speed (435cfm) I don't have a speed controller to slow it down.

I would say that most the time if you run a seed 12/12 from the start your probably not gonna have a good yield unless you pack a bunch in the space cause it will basically stretch straight up and be a 1 cola plant. Also CFL's will work fine for veg just try and get ones in the 6500k range but for flower that's not really the lights you want to be using you can its just not optimal. I would check Amazon or growace they have cheaper hps bundle deals
 
Gillettfusion said:
My 6in Grow one inline fan weighs about 12lbs. most inline fans do come with mounting brackets but from my experiments if you use straps and a heavy duty ceiling hook instead of the brackets it comes with it is quieter and no vibration in the ceiling or walls. Keep in mind I do run it at full speed (435cfm) I don't have a speed controller to slow it down.

I would say that most the time if you run a seed 12/12 from the start your probably not gonna have a good yield unless you pack a bunch in the space cause it will basically stretch straight up and be a 1 cola plant. Also CFL's will work fine for veg just try and get ones in the 6500k range but for flower that's not really the lights you want to be using you can its just not optimal. I would check Amazon or growace they have cheaper hps bundle deals
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Yeah I have followed a couple journals that did it and they got decent yield, and usually much faster than normal times. I was thinking about autoflowers for the same reason, I don't want to wait too long between harvests. Plus I like the idea of only running 12 hours of light a day.

I have these lights for now... They say 105 watt but I've seen others like them rated for 85, but they are 6500k. I did my last grow with 3 of them and got a weak yield off three plants. Had a lot of issues with the room, suboptimal light, mites, and climate control though so hopefully with a nice Mh/HPS kit and a cool tube I can get those issues nailed down. Otherwise I wound up with pretty dank stuff.

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5 lights in new tent versus 3 in my old 5x5x7 DIY panda film room...

Really excited to use this tent with everything "optimized" so all I gotta worry about is the plants. I already tested the temperature rise... My room stays like 65 f in the winter and these lights raised the tent temperature to 10 degreed higher than room, without any ventilation, and it seemed awfully stuffy. I could get away with a cheap fan for now and do something in these late winter/early spring months while the temperatures are still down but I think If rather just save toward a nice cool tube and 400 watt light kit with all the hangers and such.

Anyway blah blah I am rambling, I am just itching to go but wanna wait to make things better. Still have plenty if time to decide my strategy that way too.
 
Here's my first grow setup. Just finished it tonight. I'm planning on adding another 300 watt LED that'll make 600 watts which for my area is 200 watts more than I need (25 watts per square foot). It's a 4 x 2 tent and I'm doing 5 white rhino plants with a SCROG. I got foxfarm, seaweed extract, some Mykos, a germination greenhouse to start my clones. I have a charcoal filter with a 6" inline centrifugal fan, reduced to 4" with the pipe going out the top. I got my smart pots for when the transfer is ready and I'm super F'ing excited. Am I missing anything? Any help or suggestions are welcome and appreciated!


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First time grower, I've been following along and was hoping for some input. I'm going 4 skywalker from seed in FF ocean forest. I've been reading and watching videos for about 2 months and believe I'm ready. Any advice, input are greatly appreciated. 4x4 Apollo tent 1000w cool tube. I got everything setup today, seeds germinating. I have pictures but can't figure out how to post atm.
 
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