10'x10' Grow Room. 2 600W HPS. 1 400W MH. Venting Question

I converting my extra bedroom into a grow area. It is a 10'x10' Grow Room. 2 600W HPS. 1 400W MH in the closet for vegging. Need to keep heat down.

My questions are:
Can I vent the Lights only?
Ducting from the attic through the lights, Fan, and back into the attic?
Is the Room big enough to NOT need to vent the room as well?

Thanks

i think you need some sort of air flow in the plant chamber so it can breath the c02



but if u have your lights ducted separately u can utilize C02 in teh grow chamber


similarly i for 1 600watter in a 5'x5'

Big P said:

i think you need some sort of air flow in the plant chamber so it can breath the c02

but if u have your lights ducted separately u can utilize C02 in teh grow chamber

similarly i for 1 600watter in a 5'x5'

Click to expand...

Thanks for the reply....
If I use CO2 then no need to vent the room?
Its a bedroom...Any need to vent it if the heat is controlled?

Bizzler said:

Thanks for the reply....
If I use CO2 then no need to vent the room?
Its a bedroom...Any need to vent it if the heat is controlled?

Click to expand...

There are 3 parts to the air handling system for your grow room, one you mentioned, air cooling for the lights. It would be possible to vent all 3 of the ones you mention with one system if it doesn't have to many bends in it. It would be better to pull air from lower and exhaust it higher, do not just dump it in the attic, vent ot to the outside , it will be more efficient.
The second part of your air handling system is your intake ane exhaust. The reason is your plants are going to need 'fresh air'. Our air does contain CO2, not enough for a room full of CO2 eating monster plants, so every 3-5 minutes you need to replace the 'stale' CO2 depleted air with ' fresh air'. You would size your exhaust fan based on the cubic feet of the room, if you have 8' ceilings you have about 800 cuft. Keep in mind that the fans rating is based on not haviong any flow restrictions, no bends, no 'T's, they are flow restrictors, and if you intend to use carbon filtering oversize your fan, get the good one for that system, usually a CanFan. Your intake can be passive unless smell is a concern. If you do use a carboin filter, you will need an intake fan slighly smaller than the exhaust fans capacity, creating a slight negative pressure.
The third part is the easy part, an ocsillating fan or two to keep the air moving around, keep the air under the canopy 'fresh', and strengthens the plants stems.
What you need to do is put yourself in the place of your plants. If you are baking in the hot sun, with no breeze........and you have an attic to work with....no excuses, do it right. VV

Thanks VV

Yes room is 10'x10'x8'= 800sqft

Can I set it up like this?

Carbon Filter--600W HPS--600W HPS--6" 424cfm Can Fan--Attic run to the outside vent. Then have a small 4" passive intake in the ceiling/Attic.
Also. Dose the AC/Heater Bring in Fresh Air as well?

Bizzler said:

Thanks VV

Yes room is 10'x10'x8'= 800sqft

Can I set it up like this?

Carbon Filter--600W HPS--600W HPS--6" 424cfm Can Fan--Attic run to the outside vent. Then have a small 4" passive intake in the ceiling/Attic.
Also. Dose the AC/Heater Bring in Fresh Air as well?

Click to expand...

You can set it up any way you want and it may work, it may not be the most efficient. When I was deciding how to vent my room, I looked at the information that was available and the size of my room and tried to decide what i should spend my limited resources on. The exhaust and fresh air system was necessary, the carbon filter and can fan was not. Plants won't put out that much smell until they are in the later stages of flowering any way, up until that time an Ona Block (about $10.00) would mask any odor. So I put in 8" ducting, which has almost 2 times the capacity of the 6" and bought a cheap inline Duct Booster for less that $30.00, knowing that if I did find I needed a Carbon Filter I would have to buy a better fan. It's been a little over 2 years now, I am still using that cheap fan. It's routed to one of the roof hats so the exhaust air exits at the peak of my roof, not many folks are up there to smell it.
When I installed the furnace lights, I put in a system just for them. That way I don't add or subtract any of the air from the room, my air conditioning and heat saving will pay for the system in a year. Every fitting and bend you put in your system is a flow restriction and putting 2 lights and sockets in the exhaust system will definitely affect the efficiency of your fan, twelve hours a day your separate light air cooling system doesn't even have to be running?? unless you only have one leg of what should be a three legged stool.
And no, your air conditioner/ heater does not bring in 'fresh air', they recirculate the existing air, estimates are the air in a well insulated home is 3 exchanges per hour, you want about 20 air exchanges per hour.
and it is 800 cubic feet. VV

All Right VV!!
This is what I'm like 98% sure I'm gonna do.

My light came. 1 to start. Room stays a good temp when Light is on. So I will get a 6" inline duct fan 250cfm. Use that in my set up.
I need a passive intake some where. there is a 1" gap under my door. Will that work as a passsive intake?

You might, I said might get away with just venting the lights. I'm guessing you have A/C in the room. With the addition of Co2 your temps can run higher. You still have to address odor control. If you just vent the lights with no other intake/exhaust, add Co2, you could get a can filter , set it in the room and attach a fan. Allowing it to just scrub the odor with no exhaust.

Here's what I did.....

424cfm inline fan....vent to the attic
passive intake.....
can easily add carbon filter, Lots of airflow

Nice.

Have you started a grow journal for your room?

Very nice setup. I read your posts and I think I understand what your saying but I just want to make sure. You have your exhaust sucking out the air of the room through your light cool tubes and it exhausts into the attic right? Then you have a passive intake sucking air from outside?

I have been thinking about how I am still going to set mine up and I was planning on doing this same thing. Have the exhaust go straight into the attic and get a passive intake blowing fresh air into the room from outside.

TheOrangeJuicer said:

Very nice setup. I read your posts and I think I understand what your saying but I just want to make sure. You have your exhaust sucking out the air of the room through your light cool tubes and it exhausts into the attic right? Then you have a passive intake sucking air from outside?

I have been thinking about how I am still going to set mine up and I was planning on doing this same thing. Have the exhaust go straight into the attic and get a passive intake blowing fresh air into the room from outside.

Click to expand...

Actually the passive intake is just the space under the door...
Working great....Room stays same temp as house....

TheOrangeJuicer said:

Very nice setup. I read your posts and I think I understand what your saying but I just want to make sure. You have your exhaust sucking out the air of the room through your light cool tubes and it exhausts into the attic right? Then you have a passive intake sucking air from outside?

I have been thinking about how I am still going to set mine up and I was planning on doing this same thing. Have the exhaust go straight into the attic and get a passive intake blowing fresh air into the room from outside.

Click to expand...

you sed passive air intake blowing fresh air in... i thouht pasive ment not blowing... but being sucked in due to negitave pressure in the room.

dynamitejack said:

Have you started a grow journal for your room?

Click to expand...

Not yet...I was gonna make thins my journal...but maybe I'll start a new one.....