Exhaust into Wall??

[royaltyofrezin]

This is the plan:
I have about 5 feet vertical, and 2x3 feet floorspace
I do not have direct access to any open ventillation.


First Set of General Ventillation Questions:

1. how many CFM are necessary?? - i was thinking of running a 200 cfm

2. How loud will it be?? - including the fact that its in the closet in a corner room, with no adjacent rooms hearing the noise. I will try to mask the noise with music so visitors don't figure it out. Also there'll be a carbon scrubber.


This area is inside a closet, inside my room, which is at the end of the hall at the corner of the house adjacent to the brick wall exterior.

I was hoping to exhaust my cleaned air directly into the wall, not worrying where it goes. I know this is not a completely thought out idea, but I wanted to see if it might work.

The questions:
1. Can I exhaust into a wall generally? - Will the air flow through the wallspace and end up somewhere else?

2. Will there be a problem with backpressure?

3. How Loud will it be?? - this is for others not just for me. As in will the sound travel inside the walls??

Thanks a lot..

Pce n Best wishes..

-ROR

 

[Guest]

you forgot to mention how big the light is that you want to run. maybe a 250w or a 400w?
since its a closet and you're worried about noise id keep it to a 250w.
exhausting into a shared wall would be a horrible idea IMHO. walls are like giant speakers if you have a big fan ducting straigh into one. unless you know your wall vents somewhere, it probably doesn't, which will result in massive backpressure after about the first 5 minutes of running the fan.

 

[Guest]

Hey Royalty!

Sounds like ya got a good flower chamber on your hands! Perfect for 3-4 plants.

I'm going to assume you live in a house and not an apartment. I'm also going to assume you live with parents, or some other persons who can not know that you grow. If the above 2 items are wrong then I'm guessing you're only concerned about when you have guests come over.

My experience is if you run a 400w with an inline fan (200cfm is fine) the noise will be extremely minimal...unless ya do something dumb like mount the fan on your wall. Just don't go for the cheaper squirrel cage ones as they're much louder.

Next, to help in keeping the noise level down, use soil. Hydro will always make more noise as you have water and air pumps going 24/7.

Yes you can exhaust into a wall - it's the only way to exhaust in a closet that I know of. No back pressure (since your walls are not air tight) and yes the air will go somewhere, up in to the attic. The only time I can think of where this wont work is if you are using a load bearing wall (one that is adjacent to the outside of the house). These are usually packed with insulation and will not allow much air to pass through.


What I'm surprised you're not concerned about is the smell!

Most think a carbon scrubber will remove all the smell... absolutely it does, but are you going to run your fan/scrubber 24/7 even in flower? I never did since it was a waste of electricity.... welp, once those buds sit in that closet, in the dark, without exhausting for 12 hours... chances are good that any room adjacent to that closet will reek. To combat this I began to exhaust (during dark period) for 15mins each hour...problem solved.

 

[royaltyofrezin]

irish: im thinking 400W, maybe 600,.. i have cfls that add up to about 380, so I will be subbing for an HID as money becomes available... Although i expect soundlevel to be pretty low, I wont be sure until i implement the plan.. but good point about the wall being like a speaker.. Sidenote: there are speakers that mount to any surface, glass, wood, etc... check em out..

klutter: well i'm not building it until I make sure I can do it without major issues. And the only unresolved ones are heat, noise and fresh air. If i dont exhaust into the wall, then all these become a problem. If i can find some other way to exhaust it out of the room, that would be ideal. I plan to run this fan all day every day, just to make sure fresh air is always available, box is always under negative pressure, and no humidity/heat/cold spikes occur.

Also, as far as noise goes, there's always music running in my room, so noise as long as it's pc fan level from outside the closet, things will be fine. I just don't want to get into the situation I was in earlier. I had a 30 cfm pc fan running by itself, making a decent amount of noise. Then to compound this, my box wasn't completely closed, and didnt have any structural integrity, so hanging the light assembly had to be done from outside.. can you say ghetto... ..

without music, the fan was audible, so the solution must be quieter. Also, I was looking to add some more noise pollution to my room, without being too obvious about it.. any ideas??



Thanks a lot..

Any more input??



-RoR

 

[Benny]

As somebody growing in a closet with 3 loud fans and a loud sketchy 475 MH, I would suggest investing in extremly quiet fans, and a powerfull, but quiet fan to suck out alll the air into the hole you make in the wall ( P.s reffering to air going into the walls, its going to be smelly and will probaly give your house an essence of weed and hippie love, good for you, not for others) make sure you close off the area so nobody can spot leaking light, and i would suggest a 400 watt MH/HPS, and you will want so me sort of odor control or in flowering your room will reek. Noise wise, my last suggestion, if you have some money, is Sonic Boom, I read about it in the Cannabible, A man sells specialty nutrients and a CD of bird noises that is supposd to raise your crops yeild Alottt. You should google it? hope all this helps.!

 

[ThereIsHope]

You can not exhaust into a wall. There will "generally" be fire blocking which will restrict air movement. This is to prevent flame spread up a wall by blocking the vertical studs every so often.

You need to have it ducted or make sure you have a clear shot up any wall otherwise - backpressure and burned out fans.

 

[Maj.PotHead]

exhaust into attick or backpressure will build up venting into the wall itself i found this out and had to cut another hole from hallway closet so no backpressure would build up. i use a stanely blower fan modded for our use http://www.icmag.com/ic/showthread.php?t=29341 my lighting is 400w hps and aircooled hood inside a cab

 

[karl420]

dont vent in your house .. vent outside your growing weed and mushroom now... good luck.. that my 2cent

 

[royaltyofrezin]

Wassup All:

Benny: Good advice. I am pretty sure I can build a carbon scrubber before I get started, so smell will be good. Noise and heat is really the big problem. As soon as i figure a way to solve these two problems, I am good to grow...

TIH/Major: Now, I remember a while ago when they built the houses in this community, I accompanied my friend during the building process. They told us about "breather holes". These are supposed to allow there to be no real chances for pressure buildups. I am not sure if that works only for brick, but the side adjacent to the closet is siding and not a brick wall - my mistake...

Karl: Mushrooms?? im not getting something here..


So, we're back to square one.. Only other way i can think of is AC and co2, and that's not in my budget.

Ideas::

1. I could put a fan that connects my closet to the attic, that could vent whatever exhaust coming out of the box. The problem would be that I cannot have a pipe leading from the box to the ceiling.. I need to put my clothing somewhere.. For this reason the venting would have to be indirect, which means heat/fresh air are still issues..

2. Im out.. no more ideas.. please help me people..


Thanks again...

Pce out..

Stay safe..



-ROR

 

[karl420]

humidity = MUSHrooMMMM ..blow this air out man.. not in your living area

 

[Guvnor]

This wall you was going to vent into, does it have a cavity or is it a internal wall(solid)?

If it's got a cavity, the only thing i can think of doing is:
Vent into the wall with circular ducting, then in your cavity have rectangular ducting which will have a adapter either end to connect circular ducting. Still with me?

This ducting is small enough to fit in a standard 50mil cavity. At the top of your wall which will end in your attic, connect back to circular ducting and to where-ever you wish. Or you could just let the air vent out the rectangular ducting into your attic space.
Hope you got that?!?!

All The Best
Guv'nor


Also, why not build alittle stud wall, then throw your ducting in there, and sit your growbox against this new stud wall?

 

[royaltyofrezin]

whoa..

@ Karl: Got it. .. lol .. imagine that mistake.. landlords would kick my ass..

@ Guvnor: I kinda understood what you mean. Question is.. i would have to somehow open the interface between the attic and the cavity right?? because if i dont do anything, at least from what these guys above told me, there would be tremendous backpressure, meaning the air is going nowhere.. also.. any major construction like that.. landlords would kick my ass.. LOL

 

[Maj.PotHead]

humidity = MUSHrooMMMM ..blow this air out man.. not in your living area

honestly speakn where i live my RH is average below 20% so venting into my attick is n/p summers get ohhh 115+ july and aug.