Optimum Ventilation setup

I'm putting plans together for a new grow room. What I'm trying to figure out is what would be the optimum setup? I want to keep temps between 70 and 85. I want to only cut one intake and one exhaust hole if possible. Please see specs below.

Outdoor shed located in CO 8'W x 12'L x 8'H

Heavily insulated, drywalled, floor insulated with 1 inch pink stuff foam board, walls have additional half inch mylar

want to use turbine exhaust vent 8 or 10 inch with charcoal scrubber of some sort no smell to escape

two thirds of room will be flower with 3 1000s or 600s and one third will be veg with two 600s or 400s

I will be using a co2 burner

I'm looking for the most effecient way to run ducting for cooling and trying to optimize the co2.

Thanks for input

use an inline fan and cooltubes hooked to the exhaust vent in the pic

idk why that pic looks so horrible the original didnt look like that

busted suby said:

I'm putting plans together for a new grow room. What I'm trying to figure out is what would be the optimum setup? I want to keep temps between 70 and 85. I want to only cut one intake and one exhaust hole if possible. Please see specs below.

Outdoor shed located in CO 8'W x 12'L x 8'H

Heavily insulated, drywalled, floor insulated with 1 inch pink stuff foam board, walls have additional half inch mylar

want to use turbine exhaust vent 8 or 10 inch with charcoal scrubber of some sort no smell to escape

two thirds of room will be flower with 3 1000s or 600s and one third will be veg with two 600s or 400s

I will be using a co2 burner

I'm looking for the most effecient way to run ducting for cooling and trying to optimize the co2.

Thanks for input

Click to expand...

Wow, thats sounds like a dream operation for most people. The first thing I would advise is that your ventellation system will have to be VERY adjustable. You are living in an area (Colarado?) where outside temperatures fluctuate from one extreme to another, therefore, when working with a grow space that is located outdoors as well as intaking (is that a word?) outdoor air (which is fine) you will have to be able to moderate what is going on inside with different measures such as speed controls, thermostats, humidistats, c02 meters, possibly heaters and/or a/c units and a dehumidifier. This sounds like a lot to deal with but you can make life easier by taking some key steps now to avoid a headache later....
Let's start with the intake..
Intake
If you would only like to have one intake a good idea is to ensure that the air enters the room on the oppiste end from which it exhausts which will force it to travel across the entire growing space. I would reccommend that you use an intake fan slightly larger than what you think you need and install a speed control to that allowing you to adjust the airflow which will be key (along with the exhaust) in controlling the temperature and humidity inside based on the temperature and humidity outside. Usually you only need a speed control on the exhaust fan, but when you bring in non moderated air from outside you need one. Also make sure your intake is protected from bugs and other pests entering.
Exhaust
Once again you will want to go big here the largest filter and fan you can afford and also install a speed control. I would focus your exhuast more on the flower side of the room and have as short and direct of an exit as possible to help make it work as efficiently as possible. You could possibly on your veg side have a separate small fan and filter combo and "T" that to your main exhaust line as long as you put a baffle in the smaller exhuast line so that it only opens into the main exhaust when venting. You will have a lot of heat generating from all of those lights + co2 burner and you will need to be able to turn it up when the lights are on. and if it happens to be really warm/cold outside and you are piping in hot/cold air plus the shed itself being heated/cooled by nature you are going to possibly need the back up of a thermostat controlled air conditioner and heater, that way your system can somewhat automate itself with out you standing in there all the time adjusting speed controls. Add in a dehumidifier and you have good environmental control indoors despite having no control outside.

Good luck and let me know if you get started

If you are using CO2 the room should be sealed except for the light intake and exhause.

Below is an example as to how the light vent should be hooked up. Be sure to use insulated ducting to avoid condensation

JediSmoker said:

If you are using CO2 the room should be sealed except for the light intake and exhause.

Below is an example as to how the light vent should be hooked up. Be sure to use insulated ducting to avoid condensation

Click to expand...

I like the setup. What exactly is the air damper ? Would I run air through the lights and out through a scrubber of some sort? How would I keep smell from escaping?

busted suby said:

I like the setup. What exactly is the air damper ? Would I run air through the lights and out through a scrubber of some sort? How would I keep smell from escaping?

Click to expand...

The damper closes to prevent outside air from coming into the system during lights out. This will help with temp control and condensation.

Here is a link to an awesome electronic damper:

http://www.bghydro.com/BGH/Itemdesc.asp?ic=AFASCD06C&eq=&Tp=

As you can see in the pic on my previous post the air comes from the outside, goes through SEALED reflectors, and back outside. All the air is doing is cooling the lights. Technically you dont need a carbon filter on the end because the light cooling system should be sealed as to not let the grow room air transfer out.

When injecting CO2 you do not need to have an intake and exhause to cycle the air inside the room. The room should be sealed as well as possible so you dont have CO2 leaking.

What you will need to worry about is humidity and tempture control. In this situation it's very common to have a dehumidifier to keep the room 45%-60% humid and an AC to keep the room 78F-85F.

If you are not going to use CO2 and you want to exchange the air inside your grow room check this pic.