Ventilation setup for DIY grow cabinet

E

extremophile420

Member
I am planning to build a 2x4 grow cabinet split into two 2x2 rooms for a perpetual grow, height 6.5 feet. I will run quantum boards, qb96v2 in the flower room, qb65 in the veg room, and some t5s in the clone room.

My question is, how do i go about ventilation? I want a carbon filter in the flower room for sure, but i am a beginner to growing and i dont know how to go about ventilation even though i did my research, but it confused me a little since i am building a 2 in 1 cabinet not just one room for a complete grow.

Where should i set holes in the cabinet for proper ventilation and environment in both veg and flower rooms and what else do i need to take into consideration relating ventilation.Screenshot_20200106_222734.jpg
 
coreywebster

coreywebster

Well-Known Member
You want a filter at the top of the flower space and the veg space.
You could set the fan/s outside the cab and just cut holes for ducting close to where the filters will be in a direct line.

You may be able to use one fan and a Y duct to suck through both filters, though having different size spaces would mean the temps will differ.
(edit, if you do that you need to use same size filter each side and keep duct length close to identical)
Its likely you wont need to vent the clone section if you don't have a lot of wattage but if you needed to you could reverse your plan and have the clone section under the veg and use a PC fan to move air from clone to veg.

For all the air you extract it needs to be replaced, so if your going passive intake you need 4 times the hole size , you also need to think about light baffles to stop the room glowing up , unless you use active intakes.

Does this set up need to be stealth?
 
E

extremophile420

Member
coreywebster said:
You want a filter at the top of the flower space and the veg space.
You could set the fan/s outside the cab and just cut holes for ducting close to where the filters will be in a direct line.

You may be able to use one fan and a Y duct to suck through both filters, though having different size spaces would mean the temps will differ.
(edit, if you do that you need to use same size filter each side and keep duct length close to identical)
Its likely you wont need to vent the clone section if you don't have a lot of wattage but if you needed to you could reverse your plan and have the clone section under the veg and use a PC fan to move air from clone to veg.

For all the air you extract it needs to be replaced, so if your going passive intake you need 4 times the hole size , you also need to think about light baffles to stop the room glowing up , unless you use active intakes.

Does this set up need to be stealth?
Click to expand...
This setup is meant to be stealth or else i wouldve gone bigger than 2x4.
Do i need a carbon filter in the veg section?
I was thinking of a carbon filter on top of the flower section, with venting holes at the bottom of flower, veg, and clones with fans running inside each section. But what confuses me the most is extraction, exhaust, etc. Because i need to decide now on the design since i cannot afford to do wood mistakes.
 
coreywebster

coreywebster

Well-Known Member
extremophile420 said:
This setup is meant to be stealth or else i wouldve gone bigger than 2x4.
Do i need a carbon filter in the veg section?
I was thinking of a carbon filter on top of the flower section, with venting holes at the bottom of flower, veg, and clones with fans running inside each section. But what confuses me the most is extraction, exhaust, etc. Because i need to decide now on the design since i cannot afford to do wood mistakes.
Click to expand...
Personally I would always run a filter in veg, some plants stink.

Best thing for stealth ventilation is a bigger fan turned down with a speed controller, a variac stops fan hum and gives you control, or a temp speed controller for more consistency. You wont need much air movement if your rooms already not too warm.
I can run a 4" 180m3h , I have it turned right down so guessing at 50% , that takes care of 315 cmh.
I also have a 6" version at 370m3h , again running around 50% which takes care of two tents with 300 ish watts in each.

It really depends on your climate as to how much airflow you need. The ambient temp in your room is the starting point. Then its about the wattage which will increase the temp by an amount defined by the air exchange.
Things get more complicated if you don't vent the heat out of the room since it recycles and warms up.

Unless your in a really warm climate its likely with such low wattage a 4" fan will be enough, but remember a bigger fan run softer will always be quieter than a small one running harder, same goes for ducting.

End of the day stealth is very hard, fans are noisy, ducting is difficult to hide, but you need these things if you intend on not stinking out the whole neighbourhood.

If you give me a clue on your wattage and your ambient temp I can tell you what airflow you need.
 
coreywebster

coreywebster

Well-Known Member
Also, if you haven't already seen it there is a stealth and microcab sub forum in indoor growing, might get some ideas there
 
E

extremophile420

Member
coreywebster said:
Also, if you haven't already seen it there is a stealth and microcab sub forum in indoor growing, might get some ideas there
Click to expand...
Where i live in the winter its very cold and in the summer its very hot.
Im not really worried about the smell of vegging plants as long as flowering plants are taken care of, but i want to create the best environment for my plants in every stage in their life. Do i need extraction in veg and clone chamber?
 
coreywebster

coreywebster

Well-Known Member
extremophile420 said:
. Do i need extraction in veg and clone chamber?
Click to expand...
Technically yeah to remove the heat and keep RH stable, I have had water dripping off tent walls when I tried to not vent my veg space a long time ago.
The clone chambers the same, but since you don't need hardly any light/wattage to clone theres a lot better chance you can run without venting, with the occasional opening the cab once a day.


Always best to do thing properly, but with a stealth cab its a case of bending the rules and seeing if you can get awy with it.
A lot of people start off with a stealth cab idea but making it work and still been stealth is very difficult.
 
E

extremophile420

Member
coreywebster said:
Technically yeah to remove the heat and keep RH stable, I have had water dripping off tent walls when I tried to not vent my veg space a long time ago.
The clone chambers the same, but since you don't need hardly any light/wattage to clone theres a lot better chance you can run without venting, with the occasional opening the cab once a day.


Always best to do thing properly, but with a stealth cab its a case of bending the rules and seeing if you can get awy with it.
A lot of people start off with a stealth cab idea but making it work and still been stealth is very difficult.
Click to expand...
Ive been brainstorming ideas for nights now.. I cannot come up with a design to fit everything in a 2x4 multi chamber grow cabinet..
 
coreywebster

coreywebster

Well-Known Member
extremophile420 said:
Ive been brainstorming ideas for nights now.. I cannot come up with a design to fit everything in a 2x4 multi chamber grow cabinet..
Click to expand...
TBH 6.5ft of height is enough to be able to fit a filter and fan in the flower chamber.

Provided you build a good light trap or baffle you could vent veg chamber into the flower with a couple of pc fans, but you have to be sure light isn't getting through.

I would suggest an extra layer to this pic but to give you a rough idea..

Image result for light baffle
 
E

extremophile420

Member
coreywebster said:
TBH 6.5ft of height is enough to be able to fit a filter and fan in the flower chamber.

Provided you build a good light trap or baffle you could vent veg chamber into the flower with a couple of pc fans, but you have to be sure light isn't getting through.

I would suggest an extra layer to this pic but to give you a rough idea..

Image result for light baffle
Click to expand...
I prefer to ventilate both areas separately since im planning on building one big plant in veg and i dont want to run with humidity problems.
Or maybe exhaust the two areas using one inline fan and a y duct splitter?
 
coreywebster

coreywebster

Well-Known Member
extremophile420 said:
Or maybe exhaust the two areas using one inline fan and a y duct splitter?
Click to expand...
Yeah you can do that, but you do need filters on both sides, if you run a filter on one side and not the other it will just pull 90% of the air from the unfiltered side because there is much less resistance on that side.
Both filters same size and cfm rating, both lengths of duct roughly equal.
 
M

mikerob

Well-Known Member
extremophile420 said:
I am planning to build a 2x4 grow cabinet split into two 2x2 rooms for a perpetual grow, height 6.5 feet. I will run quantum boards, qb96v2 in the flower room, qb65 in the veg room, and some t5s in the clone room.

My question is, how do i go about ventilation? I want a carbon filter in the flower room for sure, but i am a beginner to growing and i dont know how to go about ventilation even though i did my research, but it confused me a little since i am building a 2 in 1 cabinet not just one room for a complete grow.

Where should i set holes in the cabinet for proper ventilation and environment in both veg and flower rooms and what else do i need to take into consideration relating ventilation.View attachment 4451104
Click to expand...
 

Attachments

M

mikerob

Well-Known Member
Verry similar to what ur talking about I'm working on one myself ima start a grow journal maybe u should check it out
 
You must log in or register to reply here.
Top