unique ventelation problem with my two room SOG setup...

I have three fans connected separately to the same 6" ducting. I have two rooms, two fans in one room and another fan in the other. This ducting provides them the cool fresh air they need from yet another room. However, since they are connected to the same line when the fans run separately they pull air from the opposite room which contains hotter air. So my room temp in my veg cabinet hoovers around 82-85 degrees.

The only thing i figure i can do is make a flap that drops down to cover the opening when the fans are off. But can't quite think of how to do it. Any thoughts or other ideas?

I've found that when it comes to ventillation setup, the more simple the better.

It sounds like you have a lot going on, and probably a whole lot of ductwork. There's static resistance in the ducting that creates problems, so the shorter the lines the better.

I have 6 600W lights with one exhaust fan that pulls air out of the grow room through the hoods, I just have an ambient intake.

If you can simplify everything it'll probably work out fine.

show me a pic

I hear that, about the simpler the better. But i have a 1k hps and and a 400 mh. Each room just gets really hot. So i gotta have the vent system the way it is. But i figured it out. I'm ordered some vent dampers, they are like shutters to put at the end of the 6" ducting and will close when the fans are off. Thereby eliminating the problem of pulling hot air from the opposite room. I hope this gets the temperature down.

it is a simple matter of pi-r-square. IF you insist on trying to run these lines together, just use the formula to find the capacity of the three seperate 6" lines, and make your exit line that size. a 12" diameter exit might do it. Or you could drop to 4" lines, in that case you could probably do it with an 8" exit. Backdraft dmpers will not solve the pi-r-square problem you have. VV

It's a little early to be doing geometry and algebra... Isn't it VV?



--You're having problems overheating a 1000W and a 400W?

Post # 1 is like a word problem...

I think I can solve it...

I believe you have one duct that travels through each light, through two rooms, and into a third...

Simplify it by eliminating the hassle.

I think if you just run one vent from each hood to your third room, and pull/push air from the hood into the third room it'll work out.

You'll be sucking air out of the growroom, and blowing it into the third room, so you might need a passive intake for the grow room, but there's probably enough gaps in the walls, under the door, etc so it wont be an issue.

On the other hand, you could run your vents 24/7 so you won't have a damper problem, but I think if you simplify it you wont have any issues.

On the hood, one end is open, the other end has a vent sucking ambient air through the hood... That's my solution.

get a sledge hamer and bust down the wall and make it all one room

that would work too, but make sure it's not a load bearing wall...

Tada! I drew it for you guys to see. the room with the 400watt is my veg room that will host my mothers. The 1000 watt room is my bloom room where i'm doing SOG. The two rooms are in a closet next to a bedroom.

I'm not sure a closet qualifies as two rooms... I'm thinking it's one of those sliding door ones, 8ft x 4ft...

That's a tight enclosed area to house that much wattage...

And your vents are definately complicated as hell.

Try pulling air out of both rooms, through the hoods, and make the "cold air from bathroom" be your vacume line, make that bathroom a sauna, pull hot air into it, passive intake from the bedroom will work fine.

I'm willing to bet you this will work, make yourself a sauna in that bathroom, I know at least 7 growers that do this personally, not on here, I always have a room like that where all the hot air goes...

If it's hot where you are you could always scrub it and exhaust it from the house instead of the bathroom, but it's cold as hell here, and that will save you some cash on the heating bill.

Yeah it is pretty complicated. I custom built the closet. Its 9' L x 4'W x 8'H. I also had a breaker setup and ran the electrical into the room so its on its own switch. The veg room is a separate enclosed cabinet within that closet. Its laid out like the pic here. I'm hestitant to think the passive intake would do it because when i leave the closet door open (regular swinging door) the room stays hot. My hot air goes into my huge attic which has plenty of vents. I think the dampers will help because the room the air is pulled from is rather chilly. I'll keep you guys posted. Appreciate it.

Alright... Simpliar the better.

livesoul said:

Yeah it is pretty complicated. I custom built the closet. Its 9' L x 4'W x 8'H. I also had a breaker setup and ran the electrical into the room so its on its own switch. The veg room is a separate enclosed cabinet within that closet. Its laid out like the pic here. I'm hestitant to think the passive intake would do it because when i leave the closet door open (regular swinging door) the room stays hot. My hot air goes into my huge attic which has plenty of vents. I think the dampers will help because the room the air is pulled from is rather chilly. I'll keep you guys posted. Appreciate it.

Click to expand...

"EMPTY SPACE FOR KICKIN IT"

He he he! That made me giggle.

livesoul said:

Yeah it is pretty complicated. I custom built the closet. Its 9' L x 4'W x 8'H. I also had a breaker setup and ran the electrical into the room so its on its own switch. The veg room is a separate enclosed cabinet within that closet. Its laid out like the pic here. I'm hestitant to think the passive intake would do it because when i leave the closet door open (regular swinging door) the room stays hot. My hot air goes into my huge attic which has plenty of vents. I think the dampers will help because the room the air is pulled from is rather chilly. I'll keep you guys posted. Appreciate it.

Click to expand...

Let me know when it starts raining into your house and I'll tell you what you will have to do to fix it. The hot humid air being dumped in the attic is not a good idea. VV

VictorVIcious said:

Let me know when it starts raining into your house and I'll tell you what you will have to do to fix it. The hot humid air being dumped in the attic is not a good idea. VV

Click to expand...

haha, thankfully it rarely rains where i live! But also the exhaust vents point towards vents. The attic is usually never warm. Its also well vented and huge, it has two of those spinning vent things on the roof for air circulation. Thanks for the warning though, I didn't think about that really. I'll keep an eye on it, for now its not a concern.

Really, if it's winter there, reversing the vents to the bathroom will save you money on the heating bill, and it might just work... A bunch of people I know do it.

What I'd do...

Take the vents off that lead towards the attic...

Attach duct to one end of hood, other end of duct goes to bathroom, attached to fan sucking air through hood and duct... Air from room is being removed.

Do this seperately for each hood.

In the bathroom, sit your carbon scrubber to clean the stanky air.

Hot air from the grow closet will be removed, cool air will find it's way in through a passive intake, or a cracked door...

If you want to save the co2 in the bloom area, you could leave the intake on the other end of the hood pulling air from the attic...



This will work, i'm pretty much positive.

Your setup it way to complicated, and you're thinking of adding dampers...

I'm currently running 6 x 600W hoods, one fan is pulling air through all of them, my room is consistantly 78-79 degrees.

MrHowardMarks said:

Really, if it's winter there, reversing the vents to the bathroom will save you money on the heating bill, and it might just work... A bunch of people I know do it.

Click to expand...

I heat my basement with my lights. Works like a hot dam!!

Yo whatsup fellas, just wanted to update you and let you know the Dampers worked. Its approx 75-82 degrees in the veg room. So its all looking good. I expect the flower room to be as cool as well when i start up the 1000watt light. We'll see and i'll let you know. And yeah, the plants are looking great!

cool! good job man!