Venting

hi legally flying, i have 4-6'x9'x10' rooms. in venting the rooms they would have a filter and a passive vent the same size as the exhaust pipe. can i get 245 cfm for each line after splitting the 980 cfm blower 4 ways? i am using flexable vent pipe and all of the lengths will be the same.

legallyflying said:

Jesus Christ LOL. Someone has some weird interests outside of growing weed Ok, so that sounds like a pretty cool, albeit pretty god damn elaborate system that is going to be expensive to set up as you still need all the environmental sensors. So,another route is to buy this thing.. http://www.zorotools.com/g/00029713/k-G0413971?utm_source=google_shopping&utm_medium=organic&utm_campaign=Google_Shopping_Feed


and just stick it in the room. When you want to see the temp, humidity, and co2 data, just pull the SD card out and put it in your computer. BOOM.. all data right into an excell file. It's actually pretty damn pimp. I have a similar model without CO2 monitoring, it was $70 and is made by hobo.

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Not to clutter this ops thread with more randomness , but what happened to the water cooled burner setup? I basically fashioned my new room based on yours.

Jelly Pepper said:

hi legally flying, i have 4-6'x9'x10' rooms. in venting the rooms they would have a filter and a passive vent the same size as the exhaust pipe. can i get 245 cfm for each line after splitting the 980 cfm blower 4 ways? i am using flexable vent pipe and all of the lengths will be the same.

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In regard to rated CFMs on those inline fans, I have to say I think the numbers are rough estimates at best. I actually own 4 8" inline fans of greatly varying prices, and slightly different cfm ratings and no 2 blow remotely similar to each other. I pull out a calculator all the time when doing electric set up, but never once did I for ventilation, it was pointless. I basically guessed at it, and if it wasnt enough I added another fan. In my experience however, I did always seem to end up with more fan than I needed in each situation based on what the hydro store was telling mei needed ;/.

He is what I can tell u from my current set up and u can interpolate as needed. 13x13x10 room. I have 4x 1000w hoods. Ambient room temp approx 68f. I cool all 4 xxxl 8" hoods with 8" flexible ducting with a wye at the beginning to a filtered passive intake, to a wye at the end to a 8" 675cfm maxx fan pulling air through the hoods. The air is being pulled from the same room it is being vented into. It is however a pretty big room with an ambient In The same area 65-68f. My room maintains a temp of 80-82f, this is with magnetic ballasts in the room, as well as a water cooled co2 burner. For climate control I do have a 1500w space heater that comes on now and then. I have accidentally let the heat get up to high 80s when ambients bumped to low/mid 70s 1 day.

Hey. Roid rage, yeah the co2 burner is still cranking along I kind of think that something is clogged in there as it has allot of resistance to flow but maybe that is just the setting I have on it. I do tend to burn out brushes on my motor though..I think that is because there is soo much back pressure.

Hmmm, maybe I need to change the settings on it.

legallyflying said:

Hey. Roid rage, yeah the co2 burner is still cranking along I kind of think that something is clogged in there as it has allot of resistance to flow but maybe that is just the setting I have on it. I do tend to burn out brushes on my motor though..I think that is because there is soo much back pressure.

Hmmm, maybe I need to change the settings on it.

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Water conservation aside, I've been running drain to waste with the heat all the way up, and flow all the way down. I don't think there is a cheaper or easier set up considering having to maintain pumps and solenoids, pay electricty to run them, and then possibly need to cool a rez. I did however find a cheap solenoid solution. A rainbird Sprinkler controller $15 at Lowes, plus 2x $2 brass garden hose adapters. In the summer I'll run waste to an outdoor rez to feed our veggie garden and lawn.

FootClan said:

Well i dont know what kinda plants you got but in my sealed room is dosent take hours for my plants to use up all the available Co2 in the room..... And my system is exact My Co2 censor talks directly to my computer proccesor and it quickly uses up available Co2 in my sealed room....When you say it takes hours for plants to use up the Co2 even when tightly packed in a space i would have to strongley disagree based on my findings and what my Co2 censor suggests...

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You added the word "sealed", twice in fact. I never said tightly packed plants wouldn't drop c02 levels in a sealed room, quite obviously they would. I don't know about anyone else but i use a carbon filter,.. meaning i pump air out of my grow room,.. and even in my 11x12x10'ft grow room, using only a little 84CFM PC fan i recirculate the whole volume of air in the room every 15 min,.. which means c02 is replaced 24/7, 365 for free,.. and this is why even tightly packed plants in a room wont drop c02 levels even 100ppm. So why anyone would seal there grow room and force themselves to even think about needing to give the plants c02 is beyond me, but whatever floats your boats

DIYer said:

So why anyone would seal there grow room and force themselves to even think about needing to give the plants c02 is beyond me, but whatever floats your boats

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Yeah, you can keep on singing that tune until spider mites, mold spores, aphids, etc get sucked into your room and your harvest goes to shit. Your co2 doesn't get replaced for free...you have to run that carbon filter 24/7 which costs $ plus the carbon will be spent faster. On the other hand, I spend maybe..$8 a month to maintain 1500 PPM of co2 in my room, have no pathway for pests to enter and have COMPLETE control of daytime and night time temperatures and humidity.

So I'm achieving around 30% more harvest weight, higher overall quality and density, and less chance for disease and bug outbreaks for $8 a month. And that Floats my boat...big time

hey roidrage, + rep for the sprinkler controller usage. great idea!! I know that regular inline solenoids are around $60-70.

legallyflying said:

Yeah, you can keep on singing that tune until spider mites, mold spores, aphids, etc get sucked into your room and your harvest goes to shit. Your co2 doesn't get replaced for free...you have to run that carbon filter 24/7 which costs $ plus the carbon will be spent faster. On the other hand, I spend maybe..$8 a month to maintain 1500 PPM of co2 in my room, have no pathway for pests to enter and have COMPLETE control of daytime and night time temperatures and humidity.

So I'm achieving around 30% more harvest weight, higher overall quality and density, and less chance for disease and bug outbreaks for $8 a month. And that Floats my boat...big time

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I know the benefits of sealed for keeping out pests and such, and I have not been managing my own grow for very long and already run into a couple problems with bugs. I've been able to deal with it thus far, but my sealed basement grow still gets roly polys and spiders. When I see that shit, it makes me wonder how effective my treatments for my actually hurtful pests are. I don't know how you could ever really FULLY seal. I do those 6 month perimeter sprays outside the building and such.

On that same note I agree with fully sealed as being beneficial if you are going to suppliment CO2. I actually run a filter 24/7 in the room recirculating to clean smelly air that might leak. If I do run that air out of my room, its venting to my Veg to suppliment CO2 there. If for whatever reason you don't run sealed, and most people don't, you want filters on the intake. HEPA grade if you can afford it.

It is hard to keep every single pest out of your room, but not THAT hard. If you have rolly pollies though.... dude you have some pretty big leaks in there.

The biggest rules that I follow for the flower room:

Grow room sandles only. No outside shoes (except for post harvest clean up)
Always change clothes when coming from outside gardening or from another persons garden.
Any visiting MJ grower has to wear my cheap ass tyvek suit. ALWAYS.
HEPA filters on ALL vents.
Post harvest clean up = physian 20 all surfaces, then set off a bug bomb.


I used to be willy nilly about flower room control.. until I got mites..BAD I suspect from my gro-bro that also had mites and came over to help me in the garden. Strange that the mites showed up about a week after he was here.
not wearing your outside shoes and changing at least your shirt is a big one.

Legal, do you use a split ac?

yep. right now however I am only running it on heat mode during lights off to keep DIF low. I am just using my back up temp exhaust and inlet fan setup to control temps

legallyflying said:

Yeah, you can keep on singing that tune until spider mites, mold spores, aphids, etc get sucked into your room and your harvest goes to shit. Your co2 doesn't get replaced for free...you have to run that carbon filter 24/7 which costs $ plus the carbon will be spent faster. On the other hand, I spend maybe..$8 a month to maintain 1500 PPM of co2 in my room, have no pathway for pests to enter and have COMPLETE control of daytime and night time temperatures and humidity.

So I'm achieving around 30% more harvest weight, higher overall quality and density, and less chance for disease and bug outbreaks for $8 a month. And that Floats my boat...big time

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Cant argue with logic like that......

legallyflying said:

Yeah, you can keep on singing that tune until spider mites, mold spores, aphids, etc get sucked into your room and your harvest goes to shit. Your co2 doesn't get replaced for free...you have to run that carbon filter 24/7 which costs $ plus the carbon will be spent faster. On the other hand, I spend maybe..$8 a month to maintain 1500 PPM of co2 in my room, have no pathway for pests to enter and have COMPLETE control of daytime and night time temperatures and humidity.

So I'm achieving around 30% more harvest weight, higher overall quality and density, and less chance for disease and bug outbreaks for $8 a month. And that Floats my boat...big time

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Dude,.. you ASSume too much. We don't have those problems in the climate i live,.. and if ANY part of you're rational for adding c02 comes from the cost to run a fan through a carbon filter, you might want to invest in a kill-a-watt meter and get an idea of what things really cost you.

legallyflying said:

I used to be willy nilly about flower room control.. until I got mites..BAD

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and you didn't over reaction at all

DIYer said:

Dude,.. you ASSume too much. We don't have those problems in the climate i live,.. and if ANY part of you're rational for adding c02 comes from the cost to run a fan through a carbon filter, you might want to invest in a kill-a-watt meter and get an idea of what things really cost you.

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Your the toolbox who cant understand "why anyone would seal there (sic) grow room and force themselves to even think about needing to give the plants co2 "

I spelled it out for you, and you still don't get it.

Kind of funny, how you nailed it in your earlier post. It IS "beyond you".

I hope I am not over reaction. LMAO

In my 11'x12' grow room, 14 plants, half of which are 4-5ft tall, i have 750 ppm c02 levels, with ZERO c02 being added. Only thing you "NEED" in such a room or smaller is a 100 CFM fan blowing through a carbon filter 24/7 365, which as i pointed out cost $10 a month to do, total, including electric. A fog test on the floor by the doors to my grow room show clearly the room has a negative vacuum, as fog gets sucked under the doors very small crack. I wont speak for other climates, but if you live in the SW, low humidity, no pests, that's all you have to do.

the minimum equipment for ventilation imo is 2 filters and 3 centrifugal fans. one for scrub an lower wattage light cooling. one for high wattage cooling,intake and exhaust separate from environment. and another fan with filter for exhaust. my c02 in a packed room only takes 3 hours to deplete i replenish every 2 1/2 hours. Manually tested this no sensor

all cfm based on size of room and ability to recirculate air 2x in 5 min minimum. filter cfm is half the rated cfm of fan.

alphawolf.hack said:

my c02 in a packed room only takes 3 hours to deplete i replenish every 2 1/2 hours. Manually tested this no sensor

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ummm,. How in fuck would you manually test c02 levels?..
I use a c02 ppm meter, if you're not seeing actual c02 levels update every few seconds i would really question if you have any idea what you have for actual c02 ppm levels.