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LayYouIn
Taurus


Registered: 09/28/06
Posts: 4,402
Loc: Organ
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i wont be able to vent into the attic...this'll be an apartment grow.
in line ducting fan is what i was looking at. i found this one...

...on the home depot website...it says "The fan runs on 110 volt household current and efficiently uses 30 watts of electricity" and "4 In. fan has free air CFM of 40 and max boosted CFM of 80".
im not sure about using the light in the picture you posted. it seems like it might be a hassle moving the light up and down, as im planning on having the light adjustable so that i can always keep it 6-12" from the plants.
could i just place a carbon scrubber on the exhaust of the 4" duct fan without problems? how much resistance do these carbon scrubbers cause?
with a 400 watt HPS, that would be 100 watts per sq foot, isn't that a bit high?
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Teragon
Noddy

Registered: 02/20/01
Posts: 36,253
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Re: Marijuana Stealth Grow Box #2 [Re: LayYouIn]
#8028507 - 02/15/08 06:12 PM (15 years, 11 months ago) |
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that fan isn't gonna cut it. for carbon scrubbers- you need an inline centrifugal fan.
inline axial fans like that one you posted are just too weak to force air through a carbon filter efficiently. that's what i've been told recently and i've been doing a LOT of research into this same topic.
edit: btw- for a small cabinet like you are planning, you are going to NEED a cool tube or air coolable reflector like the one that guy just posted, especially if you think you're gonna be keeping that light anywhere near 6-12in from the plants. those bulbs generate a fuckload of heat- inline cooling for the bulb is basically a necessity for any small cabinet.
-------------------- need that cash to feed them jones.
Edited by Teragon (02/15/08 06:20 PM)
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LayYouIn
Taurus


Registered: 09/28/06
Posts: 4,402
Loc: Organ
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Re: Marijuana Stealth Grow Box #2 [Re: Teragon]
#8028664 - 02/15/08 06:48 PM (15 years, 11 months ago) |
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Quote:
Teragon said: that fan isn't gonna cut it. for carbon scrubbers- you need an inline centrifugal fan.
inline axial fans like that one you posted are just too weak to force air through a carbon filter efficiently. that's what i've been told recently and i've been doing a LOT of research into this same topic.
edit: btw- for a small cabinet like you are planning, you are going to NEED a cool tube or air coolable reflector like the one that guy just posted, especially if you think you're gonna be keeping that light anywhere near 6-12in from the plants. those bulbs generate a fuckload of heat- inline cooling for the bulb is basically a necessity for any small cabinet.
THANK YOU. that's exactly what i needed to know.
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ApJunkie
part-time Ninja



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Re: Marijuana Stealth Grow Box #2 [Re: Teragon]
#8029663 - 02/15/08 11:35 PM (15 years, 11 months ago) |
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Sorry, a bit off topic, but what are the advantages of Squirrel-cage blowers? I see a fair number of people with those, is there much of a difference?
Edited by ApJunkie (02/15/08 11:39 PM)
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LayYouIn
Taurus


Registered: 09/28/06
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Re: Marijuana Stealth Grow Box #2 [Re: LayYouIn]
#8030054 - 02/16/08 03:04 AM (15 years, 11 months ago) |
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so would it work well if i had two different holes with 4" duct pipe for passive intake and a 400 watt HPS with air coolable reflector with 4" duct pipe going from it to an Inline Centrifugal Fan(135 CFM) that sends air through 4" duct pipes to a carbon filter?
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LayYouIn
Taurus


Registered: 09/28/06
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Re: Marijuana Stealth Grow Box #2 [Re: Teragon]
#8030928 - 02/16/08 11:38 AM (15 years, 11 months ago) |
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Quote:
Teragon said: you are going to NEED a cool tube or air coolable reflector
is there a big difference between these two? how much cooler would the cool tube be that the air coolable reflector?
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Zinglons Acolyte
Wizard Ninja



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Re: Marijuana Stealth Grow Box #2 [Re: LayYouIn]
#8032213 - 02/16/08 06:48 PM (15 years, 11 months ago) |
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the cool tube removes the heated air from the cabinet, rather than an air cooled one which is cooled BY the air in the cabinet
-------------------- And they wandered off.. nine ways till bedfast. ----- "And lets pray that there's intelligent life somewhere up in space 'cause theres bugger-all down here on earth!" -Monty Python's "The Universe Song" from The Meaning of Life "In the beginning, the universe was created. This has made a lot of people very angry and has been widely considered as a bad move." -Douglas Adams "The Hitchhikers Guide to the Galaxy" "If the words 'life, liberty and the pursuit of happiness' don't include the right to experiment with your own consciousness, then the Declaration of Independence isn't worth the hemp it was written on." -Terence McKenna
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LayYouIn
Taurus


Registered: 09/28/06
Posts: 4,402
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Quote:
Zinglons Acolyte said: the cool tube removes the heated air from the cabinet, rather than an air cooled one which is cooled BY the air in the cabinet
isn't a cool tube when the light has a glass tube around it and the pump sucks air through that glass tube?
but i figured an air coolable reflector is a reflector with a hole in it, piping attached to the hole, and a pump sucking air through it. basically the same as a cool tube but with out the glass tube. is this right?
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Zinglons Acolyte
Wizard Ninja



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Re: Marijuana Stealth Grow Box #2 [Re: LayYouIn]
#8032548 - 02/16/08 08:15 PM (15 years, 11 months ago) |
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oh my mistake
theyre pretty much the same then as far as i know
-------------------- And they wandered off.. nine ways till bedfast. ----- "And lets pray that there's intelligent life somewhere up in space 'cause theres bugger-all down here on earth!" -Monty Python's "The Universe Song" from The Meaning of Life "In the beginning, the universe was created. This has made a lot of people very angry and has been widely considered as a bad move." -Douglas Adams "The Hitchhikers Guide to the Galaxy" "If the words 'life, liberty and the pursuit of happiness' don't include the right to experiment with your own consciousness, then the Declaration of Independence isn't worth the hemp it was written on." -Terence McKenna
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LayYouIn
Taurus


Registered: 09/28/06
Posts: 4,402
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Re: Marijuana Stealth Grow Box #2 [Re: LayYouIn]
#8034566 - 02/17/08 12:41 PM (15 years, 11 months ago) |
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here's what i've come up with...

i cant post links to the items...but i have them listed in this thread...
MOD EDIT: no non sponsor links please thank you.
will it work?
Edited by royer9864 (02/18/08 05:41 AM)
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Lawrence
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Registered: 08/24/03
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Re: Marijuana Stealth Grow Box #2 [Re: LayYouIn]
#8036979 - 02/18/08 08:24 AM (15 years, 11 months ago) |
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Very very nice setup. AWESOME
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Lawrence
member



Registered: 08/24/03
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Re: Marijuana Stealth Grow Box #2 [Re: LayYouIn]
#8037050 - 02/18/08 08:46 AM (15 years, 11 months ago) |
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Very very nice setup. AWESOME
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LayYouIn
Taurus


Registered: 09/28/06
Posts: 4,402
Loc: Organ
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Re: Marijuana Stealth Grow Box #2 [Re: Lawrence]
#8039613 - 02/18/08 07:11 PM (15 years, 11 months ago) |
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Quote:
Lawrence said: Very very nice setup. AWESOME
thank you.
but i just learned that it's better to have the inline fan suck air through the carbon filter, then push the air through piping that leads to the cool tube and have piping on the other end out the cool tube that leads out of the box. so ill be redesigning the top ventilation area completely. thank god i learned that before building the box.
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ApJunkie
part-time Ninja



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Re: Marijuana Stealth Grow Box #2 [Re: LayYouIn]
#8039880 - 02/18/08 08:08 PM (15 years, 11 months ago) |
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How is that better? It seems as though the fan would be more efficient with an uninhibited intake. If it can take in air freely it can combat the resistant force of the carbon filter, but if the carbon filter is restricting the flow into the fan it seems (to my drunk mind) that it would be less efficient at creating an effective vacuum inside the filter to adequately ventilate the box.
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LayYouIn
Taurus


Registered: 09/28/06
Posts: 4,402
Loc: Organ
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Re: Marijuana Stealth Grow Box #2 [Re: ApJunkie]
#8040735 - 02/18/08 10:52 PM (15 years, 11 months ago) |
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Quote:
ApJunkie said: How is that better? It seems as though the fan would be more efficient with an uninhibited intake. If it can take in air freely it can combat the resistant force of the carbon filter, but if the carbon filter is restricting the flow into the fan it seems (to my drunk mind) that it would be less efficient at creating an effective vacuum inside the filter to adequately ventilate the box.
Quote:
This setup will work just fine it meets the max recommended light before it's just excess. but I would change the airflow to prevent heat buildup in the filter. You should be sucking air from the carbon filter, blowing it into the cool tube, then directly out of the box. This prevents any heat buildup and keeps your bulb and the glass cleaner, gives just that little bit more light without dust buildup.
i did read, that a carbon scrubber will cause resistance up to 30%(but im not sure which way this is referring to). i also read that for a grow box, i'll want 3-5 times more cubic feet per minute output than the cubic feet in the box.
so my mathematics...
the inline fan = 170 cubic feet per minute - 30% = 119 cubic feet per minute
the space in the box = 30 cubic feet
30 x 3 = 90 30 x 5 = 150
so that puts me just over 4x output. but, without the top ventilation area, ill have a couple more cubic feet. and on top of that, the fan might be over rated. so i may just need to buy a more powerful fan.
to be honest, i think i like this idea better than having a separate ventilation area. it'll allow me to change the bottom ventilation pipes to 6", simply have them come in, go up, go over, go down, and enter the box, and ill be able to make it 3' high rather than 2' high. im just wondering if that'll keep light from coming out...since the pipes will be bigger.
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ApJunkie
part-time Ninja



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Re: Marijuana Stealth Grow Box #2 [Re: LayYouIn]
#8045595 - 02/19/08 11:28 PM (15 years, 11 months ago) |
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Finished the box today! 
250W HPS light with 3" ducting running down to the fan (110 CFM). We decided it would be best if the carbon filter was in an attached unit to the side (didn't want to sacrific half of our growing area to keep it inside). Oh yeah, and on the bottom we've got a 10 gallon DWC hydroponic setup 
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LayYouIn
Taurus


Registered: 09/28/06
Posts: 4,402
Loc: Organ
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Re: Marijuana Stealth Grow Box #2 [Re: ApJunkie]
#8048844 - 02/20/08 07:37 PM (15 years, 11 months ago) |
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Quote:
ApJunkie said: Finished the box today! 
250W HPS light with 3" ducting running down to the fan (110 CFM). We decided it would be best if the carbon filter was in an attached unit to the side (didn't want to sacrific half of our growing area to keep it inside). Oh yeah, and on the bottom we've got a 10 gallon DWC hydroponic setup 
damn, that looks pretty good. what are the temps running at with a 110 CFM? does light leak out? more pictures?
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ApJunkie
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Re: Marijuana Stealth Grow Box #2 [Re: LayYouIn]
#8051833 - 02/21/08 01:12 PM (15 years, 11 months ago) |
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Thank ya kindly 
Right now the temps are hovering around 75-78f, but I'm a little worried they might get higher than that once the carbon filter is installed. I'm planning on buying a cooltube farther down the line though, so it shouldn't be too much of a problem hopefully.
I haven't really decided what to do about the light issue quite yet. I could make it light proof, but then I'm scared about having adequate air intake which could raise the temps even more.
Any suggestions?
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LayYouIn
Taurus


Registered: 09/28/06
Posts: 4,402
Loc: Organ
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Re: Marijuana Stealth Grow Box #2 [Re: ApJunkie]
#8053188 - 02/21/08 06:41 PM (15 years, 11 months ago) |
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Quote:
ApJunkie said: Thank ya kindly 
Right now the temps are hovering around 75-78f, but I'm a little worried they might get higher than that once the carbon filter is installed. I'm planning on buying a cooltube farther down the line though, so it shouldn't be too much of a problem hopefully.
I haven't really decided what to do about the light issue quite yet. I could make it light proof, but then I'm scared about having adequate air intake which could raise the temps even more.
Any suggestions?
how long did you let it run before taking the temp?
how does air get into the box?
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ApJunkie
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Re: Marijuana Stealth Grow Box #2 [Re: LayYouIn]
#8053328 - 02/21/08 07:12 PM (15 years, 11 months ago) |
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Quote:
LayYouIn said:
how long did you let it run before taking the temp?
Over night, about 18 hours.
Quote:
LayYouIn said:
how does air get into the box? ?
Exactly
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