[Greenthumber]

How's it going everyone? About to begin construction of 12x8 flower room along side a 5x6 veg room in a basement and looking for advice on passive ventilation compared to both rooms having separate exhausts I'm worried if I do passive ventilation that I'll dump positive pressure into one room From the other? Or make it harder to control temp wise from room to room? What do you recommend from your experience with either? Thanks in advance

[Greenthumber]

Originally Posted by Greenthumber

How's it going everyone? About to begin construction of 12x8 flower room along side a 5x6 veg room in a basement and looking for advice on passive ventilation compared to both rooms having separate exhausts I'm worried if I do passive ventilation that I'll dump positive pressure into one room From the other? Or make it harder to control temp wise from room to room? What do you recommend from your experience with either? Thanks in advance

Here is a rough draft

[LifeLess]

Good Luck. Hard to get help around here anymore. I'm also resetting up a room but couldn't get anyone to even say hi. Must be a trade secret.

[Greenthumber]

Originally Posted by LifeLess

Good Luck. Hard to get help around here anymore. I'm also resetting up a room but couldn't get anyone to even say hi. Must be a trade secret.

For the most part I have it figured out just trying to get opinions from people that have experienced both, I can be patient lol I was referred to this site from a friend and from browsing and word of mouth a lot of the people in here can be quite helpful

[Mikell]

Passive intakes should be double the size of the active outtake.

Why run an AC? It will cycle constantly, running up the power bill for minimal result. If outdoor temperature is too high I would be looking at a closed room

It would be preferable to separate, in my opinion. If something fails the issue is isolated.

[Greenthumber]

Originally Posted by Mikell

Passive intakes should be double the size of the active outtake.

Why run an AC? It will cycle constantly, running up the power bill for minimal result. If outdoor temperature is too high I would be looking at a closed room

It would be preferable to separate, in my opinion. If something fails the issue is isolated.

That's part of why I was considering doing separate was the whole isolation issue,

As for the Ac I'm not totally positive I'll need it yet but have it in the plans incase I do. I plan on eventually getting to a closer room set up but it will be a little bit before I can get to that,, The basment i will be in stays about 67-72 degrees year round but I know once I get some lights going that will increase quite a bit

[Dislexus]

Originally Posted by Greenthumber

How's it going everyone? About to begin construction of 12x8 flower room along side a 5x6 veg room in a basement and looking for advice on passive ventilation compared to both rooms having separate exhausts I'm worried if I do passive ventilation that I'll dump positive pressure into one room From the other? Or make it harder to control temp wise from room to room? What do you recommend from your experience with either? Thanks in advance

You could just have your intake hole be in one room, an exchange hole between both rooms, and your scrubber and output in the other room. Air comes in one room, flows to the other, and is scrubbed out, all the same negative pressure if everything is balanced.

My main worry is your vented lights system sucking/pushing smelly air out, I've seen threads about it in the past. Plus all that cleaning of the glass and reflectors or you lose light efficiency.

[Dislexus]

Originally Posted by LifeLess

Good Luck. Hard to get help around here anymore. I'm also resetting up a room but couldn't get anyone to even say hi. Must be a trade secret.

Fix your post Lifeless, all you posted was "I": https://www.icmag.com/ic/showthread.php?t=345038

[Greenthumber]

Originally Posted by Dislexus

You could just have your intake hole be in one room, an exchange hole between both rooms, and your scrubber and output in the other room. Air comes in one room, flows to the other, and is scrubbed out, all the same negative pressure.

I actually just ventured into a friend of the family's grow room today he had a Similiar setup as to what you're describing with a passive intake between the two rooms only difference is he has a mini split head unit in each room with two passive intakes between both rooms one going from the veg to flower room and one from the flower to veg room for extra air circulation and also had a cf scrubber in each room but kind of through me for a loop when he had a stand alone Ac unit exhausting air throug a carbon box to outside the house.. doesn't a mini split cover for the need to exhaust outside?

My main worry is your vented lights system sucking/pushing smelly air out, I've seen threads about it in the past. Plus all that cleaning of the glass and reflectors or you lose light efficiency.

!

As for the vented light system I plan on running that on its own intake and exhaust to not have the extra heat in the room, will they still pull out the dank smell?

[Dislexus]

Usually reflectors aren't perfectly sealed so by your sketch above it would be sucking some smell out of the veg room. Then, as you are pulling from veg light and pushing to flower lights, any leakage from your higher CFM aircooled lights in your flower room could offset the negative pressure being created by your lower CFM scrubbed flower room exhaust.

I am biased on the subject but you're going to have AC you may not even need to aircool the lights, making your setup simpler and less work to maintain. Also with AC you have the option of CO2 later on and that doesn't usually work well with the aircooled lights. You could have your AC and CO2 in your flower room, scrubbing but not exhausting, or you could exhaust into the remaining basement space, which is then drawn in passively through your veg room back into your flower room to be scrubbed and recirculated.

OR to maximize your space available in your flower room use the rest of the basement outside the rooms as the "lung" by moving the AC, DH, and CO2 outside of your flower room, and drawing in passively to the flower room, through it to veg, and scrubbing out of the veg back into the lung, all without air-cooled lights.

Really its all about what you prefer and who knows it may change. It would suck to buy too much equipment and be stuck with it, better to start with the least equipment option then buy more if you need it. Maybe order the lights first and slap them up temporarily just to see how much they bump your temps up?