Air flow,

[succotash]

Hi - first, thank you to everyone for helping me get to where I am. It's been awesome to see the inspired ideas that you all have come up with. I'd appreciate some help with the cab I've come up with:

I'm growing in a 20.25 x 48 x 80" wardrobe type cab (from OSH; Home Depot stocks one almost identical), split into two 24" halves. One half will be a 250w flower chamber, sucking through a mother/rooting chamber on the bottom, through a cool tube and out a carbon filtered. The cure section will be separately vented and filtered, unless I can combine them?

I've found that 4 waterfarms will fit almost exactly, and should be easy to set up for scrog (clotheshangers and string, or something better). T12 fluoros (4 2' tubes) should be enough to support mothers and seeds - especially since I'm only flowering a 2x2. I've got enough clearance for a 250w hps, and I hope that the cool tube will be wide enough (3.75" diameter) to cool about 20 cubic feet. I was going to get a 4" Vortex with a speed controller, but I was recommended a 6" big computer fan for stealth (which I have not heard yet); is it possible to get a 4" inline fan

I'm pretty clueless about the ventilation though. I know I want to exchange the air about 3 times per minute (so 60 real cfm, including ducting and carbon filter loss), and that passive intakes should be double the area of the fan exhausting.

-What size should I make the intake to my mother chamber? The mother exhaust/flower intake?
-What happens when the exhaust and intake fans are the same size: will there be any negative pressure?
-How much air is too much?
-Is a digital 250w much better than a 250w hps for scrog? Much quieter?

That's all I can think of for now; peace

 

[george j warner]

when you do a picture of a set up just do the air flow in arrows ... thats air brush looks like you've spilt something on it


i'll modify your plant to make some sense brb

 

[george j warner]

here you go a picture you can understand

oh a few things the 2ft flo tubes wont fit in the mum room as the depth is to short and so is the width there for i have put a enviro light in the mum room as it only comes to 46cm including E40 socket (width is 50cm.... a 2ft tube would be 60cm ).

computer fans are a bad idea if you got air you really need to shift ..

also the cooltube you thought you would be able to have will not fit as they are all 5" or more and between 40 and 60 cm long ... most are 50cm so if a 5" x50cm long cool tube is beinhg used the area you actually need is 50cm plus 2 times 5" (12.5cm) so thats 50cm +25cm = 75cm is needed ... you got 50cm


a standard HPS can be used as you got the height .... so a proper fan is required .. a 4" vortex will do the job fine

and in a wodding box it will be muffled also the fan speed controller is needed
. i have also linked it up in the picture with a thermostat (STAT) IN THE FLOWERING ROOM
this means if the temperature rises above lets say 23degrees C (75 degrees F) the fans will come on at the speed the controller is on .... but it will also come on through the timer if its a cold day .... so means you got total temperature control with and without a timer : )


just link the output of the stat to a junction box (2 wire go to 1 ...and can be bought in any DIY shop)and the timered plug (before the speed controller)to the same side... then the output of the junction box goes to the FSC then on to the fan... if you dont under stand i'll draw a simple picture for you ?

think thats it heres the design:





hope this helps

 

[george j warner]

link to a muffled box for the fan :

http://boards.marihemp.com/boards/thd11x17195.shtml

scroll down to the hole box .... the muffle box removes 80% of the noise... the fan speed controller does the rest

 

[george j warner]

thermostat rig:

 

[Guest]

George holy shit! Some nice photoshop work... you did that shit like its your job! Are you working for icmag or something?

 

[famous]

damn george...youre PS work is very helpful.
I'm trying to figure out my setup a little bit, you think you could help?
ill send you a PM now

 

[george j warner]

yer send whatever you want and i'll ps it up , not my job yet but working on it ... no dont work for ic lol : ) , im just good a building grow rooms .. in my mind and in practical ..

i wont be able to do anymore ps work tonight as im at mates house ...

laterz

 

[succotash]

Holy crap, what an impressive response. George - thanks for the ideas; there were a few mis-communications (the cab is 48" across and 20.25" deep), but I'm still plagiarizing your cabinet. The fan box is brilliant - I could probably make the walls out of green glue + soundboard "sandwiches" to make it even quieter. I have some ?s about your diagram though:
-what kind of fans should I use? It looks like the vortex fan takes care of the moms and flowering, with some computer fans or small oscillating fans to circulate. Then I should use 2 4" holes or one 6" hole for passive intake in the mother chamber. Will equal sized holes get the air into the flower chamber efficiently? I really want to do this in the most efficient way.

-Do the bold red arrows show air going through light traps/louvers? Wouldn't a separate fan be better for a slow cure, instead of having it drying next to a vortex?

Cheers.

 

[george j warner]

oh ok 48 wide ... well that means the cooltube or the 2' flos up to you ...you cant have both ..

personally i wouldnt have the dry box in there at all .. there are plenty of ways to dry weed ...like instead build a box next to it so the intake vent attatches to it .then though the dry box the intake vent is a larger hole on the other side. so this means there will be no light leeks then just have a black clothes above the dry box out take (mother intake) so the dry box doesnt get light ..

if you have a 4" vortex sucking air out when the HPS is on the fans will have to be on pritty much 75% of the time just to get rid of the heat ... if you want get a 5" but the 4 will do

so the movement fans will not be needed but have them in place on a timer just because .... you dont need any fans blowing air through the boxes/chambers as the vortex is sufficiant enough to create a good vacum sucking air in .... hense the name "vortex"

to will be no heat build up if you design it like this .... the red arrows shows hot air and the blue cold ... there will be a slight raise in temp where the electronics are but as thats next to the carbon filter and out take so it doesnt matter .

think thats it yer the extra space a cool tube or a 2' flo ...
as the whole grow is now 122cm wide instead of 101cm there is extra room but you would need 135cm to get a cool tube and a 2' flo


if you decide to get the cool tube it means either you will need another 5" fan OR the speed controller will have to be on above 80% ... just because you have soundproofed the fan doesnt meant there isnt powerful air flow noise ....the less the rpm of the fan the less air noise is made ..

for the computer fans link them all up to 1 mobile phone charger as its normally only 6volts its half the speed and thats quieter !!!

i can design it so there is 2 intakes both in taking the same amount of airbut it meants the dry chamber will not be able to be there .... at the bottom fine but not half way up ?

laterz

 

[succotash]

well, I'd like the drying to be in the same box, but it can be at the bottom too. I could have it at bottom, exhaust through a separate 4" tube with small scrubber and adjustable comp fan, sucking its air separately. Then your box would work great: the fan would take care of the flower and mother chambers together.

I'm actually leaning towards a Panasonic whisper fan with the diy scrubber, all shown in this thread... a 6" ceiling 150cfm fan only makes 0.6 sones (1 sone = 40 db!), and should take care of 20 cubic feet no problem. Stealth is my #1 priority, and it's an easier setup too. Maybe even the 4" 80cfm?

 

[george j warner]

well here you go this is what i did before you updated

 

[famous]

It's not letting me PM you George because of my post count, so i'll just post in here:


I'll be growing in an 8x8x8 room, using a 600W Digitial Fusion Hood/Ballast, 6" ducting exhausting through the left wall(exhaust hole is already in the wall), 6" Ecoplus Inline Fan, and Carbonair filter. To draw air, i'll have a 4" hole drilled into the floor(the cab is about 6" above the ground) and using a 4" Ecoplus duct fan.

The original plan since the room is larger than the plants, is to set the carbon filter opposite the intake hole, on the ground, then have the inline above that, to ducting, through light, and out the exhaust.

The only problem i see wth that is that my exhaust will be on the same side as my intake, but one is drawn through the wall, and one drawn through the floor.

I dont have a fan speed controller, is that necessary? cant i just run it full throttle? Noise/smell really arnt a problem, since hte hut is located about 50 meters away from my house, and the house is secluded.


Thanks again so much for the help, i REALLY appreciate it.

 

[guest5703]

man you guys this helps me a lot too, I just built my box, but already I notice I should have probably secured the fan more noise friendly and smell isn't much of a problem for me either but I did want to run my fan 15 every 30 minutes thought that would be smart...But anyway great images guys, PEACE

 

[george j warner]

famous can you do a really quick stetch of room with dimensions (measurments)
where everything is and such .. then i'll get my brain working lol

 

[george j warner]

this includes doors, windows, sinks, if the walls are slanted at a certain point,
measurments between intake and end of a wall ,out take etc,, where the you want to light to be ish , have you grown in soil or hydro ....

go in there with a tape measure and measure it up ... down to the last detail

laterz

 

[famous]

thanks george, but i already got the equipment, and set it up.
Check out my thraed in this forum: My First Setup: What do you think?
I'd still appreciate your input on my growbox!