Vent into Attic

scragelynugz

scragelynugz

Well-Known Member
I think I have heard of people venting their grow room air into an attic instead of directly outside. In my new space this would be easy to do. Is this a bad idea? Mold problems? Causing a major dust movement in the attic?

The attic has a couple of those spinning vent things on the roof and screened windows on the side. Thank you.
 
jhershner11

jhershner11

Active Member
i too am wondering the same thing. I think the only issue would be mold growing in the attic from the moisture being exausted out of the room
 
G

GreenGrin

Active Member
I'm growing in a 2' x 4' closet and venting straight up into the attic. I'm using a small 4", 105 cfm fan mounted in a dryer vent--the kind you see going out the side of your house. The air intake is just the gap under the closet door.

I have no sign of humidity issues and the temp of my flowering (upper section) under a 250w hps never gets above 85 degrees F. As long as the fan is running, I have no odor problems and you can't smell anything outside of my house. I don't use any kind of carbon filter.
 
OregonMeds

OregonMeds

Well-Known Member
It is a very bad idea because it will cause not only mold but dry rot. All the vents in any house, bathrooms etc etc are always run all the way out. You can go through the attic and straight out the roof or sidewall though a vent though but don't just vent into the attic itself.

Even a small grow which doesn't put out enough humidity to really matter much will still suck the humidity from the rest of the house anyway so the grow size is irrelevant.

You will get away with it for a while though, problems won't show up immediately and if this is a rental and you don't like the owner...
 
apasunee

apasunee

Well-Known Member
Im goin to vent to the crawlspace above my closet growroom and I will let you know how it goes but Im guessing that it would depend on where you live(dry or humid climate) to see about mold or dryrot issues..good luck..:weed:
 
apasunee

apasunee

Well-Known Member
So, do you think that would be a problem if there is just a few plants and living in the mojave desert, like pheonix az.
 
OregonMeds

OregonMeds

Well-Known Member
It's the moisture from you, your shower, cooking on the stove, etc. Even in arizona you shouldn't do it, but yes you probably actually could get away with it there if the attic is ventilated enough.
 
VictorVIcious

VictorVIcious

Well-Known Member
scragelynugz said:
Thanks for the response guys - I appreciate it. I'll just vent directly to the vents in the attic.
Click to expand...
....I vented mine directly to the roof too. You could get away with it in Arizona with the attic ventilation you have, the turbines move a lot of air. You could not get away with it in Michigan. lol VV
 
visine

visine

Well-Known Member
I mounted my fan in my attic directly under a whirly bird. The ducting runs from the grow room, into the attic, up to the fan, then the exhaust pumps out of the fan into the whirly bird, and out the roof. NO issues what so ever. The work was done by a licensed general contractor. He later recommended adding another peace of ducting tot he exhaust side of the fan to ensure it vented as close to the whirly bird as possible.
 
S

Secret Grower

Active Member
OregonMeds said:
It is a very bad idea because it will cause not only mold but dry rot. All the vents in any house, bathrooms etc etc are always run all the way out. You can go through the attic and straight out the roof or sidewall though a vent though but don't just vent into the attic itself.

Even a small grow which doesn't put out enough humidity to really matter much will still suck the humidity from the rest of the house anyway so the grow size is irrelevant.

You will get away with it for a while though, problems won't show up immediately and if this is a rental and you don't like the owner...
Click to expand...
Right on the money!!!!

BAD IDEA! In my other life I deal with this scenario on a daily basis, can you say mold is gold!
 
Serapis

Serapis

Well-Known Member
OregonMeds said:
It is a very bad idea because it will cause not only mold but dry rot. All the vents in any house, bathrooms etc etc are always run all the way out. You can go through the attic and straight out the roof or sidewall though a vent though but don't just vent into the attic itself.

Even a small grow which doesn't put out enough humidity to really matter much will still suck the humidity from the rest of the house anyway so the grow size is irrelevant.

You will get away with it for a while though, problems won't show up immediately and if this is a rental and you don't like the owner...
Click to expand...
Attics are usually well ventilated with heat exhaust, gable vents and soffit vents. Just run the exhaust ducting to a soffit screen or gable vent and you are fine. The shorter the run, the better.
 
S

Secret Grower

Active Member
Yeah! OK...:wall:

Don't listen too people who don't know what they are talking about...

I am a Industrial Hygienist with 2 different building science degrees. This is what you will get, if your in a colder climate or one that at least sees frost.

Soffits are under a positive pressure bringing air into the attic not expelling it. :wall:

Here is a good example of why not to vent your anything into your attic.
 

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juniorbud313

juniorbud313

Active Member
well im doin the same thing myself man i have quite literally just cut a hole in the cupboard through to the attic, as i have a 400watt HPS and it is one hot motherfucker. but mould and rot sprang to mind 4 me so im gonna ge some ventin tube and vent the air through this to avoid it. but for the meantime i have a circulatin fan doing the business! its just temperory though! hope it works out for ya!


ITS ALL:leaf:HERBAL!
 
S

SlikWiLL13

Well-Known Member
im not saying nobody has had problems with this, hell youve got pics of folks having problems. but i myself have vented into my attic for about 5 yrs with no ill effects. a properly vented attic is made to breathe. but its also quite easy and inexpensive to run the ductwork an extra several feet
 
S

Secret Grower

Active Member
LOL, I have 1000's and 1000's of these pictures...


Spend the $20 and a little time and do it right... Either vent it out of the gable end with a dryer vent cover that has a draft blocker on it or at the roof line with a dedicated roof vent. If you have to be extremely cheap at least run the ducting to either a roof vent at the ridge or into the ridge vent. Do not vent it to the soffit! That is the worst place for you to run your vent line. Note the pictures, see the pattern of mold growth that went up the roof sheathing as a direct result of the stack effect which is what happens with soffit vents. Not much more work but a whole hell of a difference to your homes structure.

Keep on puffin!
 
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