Running extraction and intake fans through one wall vent with Yconnector?

[KezuSajai]

I am in the process of designing my first grow room, which is around 80 square feet. I have a single wall vent which is a square hole in the wall that allows fresh air into the room. I would prefer not to have to vent ad duct by cutting holes in the ceiling. I am looking to get a 12mm extraction kit with a 1350 m3h power and an intake fan 25% less at around 1015 m3h.

Can I simply buy a Y connector and intake and exhaust through one hole in the wall?

 

[Mak'er Grow]

Short answer is no.
The intake will just suck the exhaust back in...not much will exhausted...and not much fresh air will be drawn in.
Thats more of just recirculating the air.
I would think anyways.

 

[sandman83]

just use a single exhaust, using it the way you describe you will be sucking in the exhausted air. Use a fan for exhaust and passive intake holes.

 

[KezuSajai]

just use a single exhaust, using it the way you describe you will be sucking in the exhausted air. Use a fan for exhaust and passive intake holes.

Did you read the OP sandman? I am using a room, no tent. I have a single vent hole in the wall. Passive intake isn't an option.

 

[KezuSajai]

Short answer is no.
The intake will just suck the exhaust back in...not much will exhausted...and not much fresh air will be drawn in.
Thats more of just recirculating the air.
I would think anyways.

Thats what I thought, however if I had the intake fan connected to the Y connector and the extraction fan at the other end connected to the carbon filter, wouldn't the draw from the closer intake fan mean more is being pulled from outside because the intake fan is closer?

 

[sandman83]

Did you read the OP sandman? I am using a room, no tent. I have a single vent hole in the wall. Passive intake isn't an option.

Sorry I missed that, but you still have a way to get IN the room right? so there's a door....

There is no directional air in that Y connector, it will just flow to path of least resistance.

 

[Mak'er Grow]

I think which ever is moving the most air volume will be the "winner" and length also will determine it too...so either way only 1 will work half ass'd.
Maybe if you put 2 end to end and a divider down the middle (red line) it 'may' work.
Excuse the windows paint drawing.,..lol

But it may also reduce the volume of air able to go through.

 

[KezuSajai]

Sorry I missed that, but you still have a way to get IN the room right? so there's a door....

There is no directional air in that Y connector, it will just flow to path of least resistance.

Yeah but I am not in the position where I can just leave the door open unfortunately. What if I added an inner seperation between the Y connector, so each side has a seperating inner wall ? Would that remedy the issue in your opinion?

 

[KezuSajai]

I think which ever is moving the most air volume will be the "winner" and length also will determine it too...so either way only 1 will work half ass'd.
Maybe if you put 2 end to end and a divider down the middle (red line) it 'may' work.
Excuse the windows paint drawing.,..lol
View attachment 4458910

Yeah that seems to be the issue. Would a divider in the Y connector, creating two seperate channels, remedy the problem?

 

[Mak'er Grow]

Yeah that seems to be the issue. Would a divider in the Y connector, creating two seperate channels, remedy the problem?

I think it would divide the flow volume in half.
So a 6" would now be a 3"...I think...like a bottle neck.
I never did much vent work in my day, but I think there are guys on here that know all about them and would be able to give you better understanding or ideas.

 

[sandman83]

Yeah but I am not in the position where I can just leave the door open unfortunately. What if I added an inner seperation between the Y connector, so each side has a seperating inner wall ? Would that remedy the issue in your opinion?

My point being, if there is a door, there is a gap under the door for air flow to come in. Perhaps take a 1/2" off the bottom of the door won't really look that much different but will allow air exchange and you can keep the door closed. Intake and exhaust need to be separate IMHO, you might get away with it for awhile though. Sounds like you will need to modify the ceiling or wall slightly, drywall is pretty easy to patch if you are handy.

 

[coreywebster]

I am in the process of designing my first grow room, which is around 80 square feet. I have a single wall vent which is a square hole in the wall that allows fresh air into the room. I would prefer not to have to vent ad duct by cutting holes in the ceiling. I am looking to get a 12mm extraction kit with a 1350 m3h power and an intake fan 25% less at around 1015 m3h.

Can I simply buy a Y connector and intake and exhaust through one hole in the wall?

View attachment 4458884

Like the others said it will just circulate, the air going out will be pulled back in.
Unless you deliberately seal the room its surprizing how much air flow there is with gaps under the door, cracks under the skirtings ect but still 1300m3/h is a fair amount. You might be able to get away with a series of floor vents to allow air from under the floor cavity, most likely there are good gaps from the plumber, electrician. Sometimes there is no gap between rooms under the floor but it depends on the age and construction of the house.

If its a chimney vent (doesn't sound like it) then you can tap into the other chimney cavities which run next to each other providing they are not active. But if its just a wall vent then I would put another in a few meters away from the one you have. Its not a big job if there is room to do it.