Venting thru the attic

[messn'n'gommin']

I have never personally vented into an attic, but i wouldnt reccomend it unless you wanna have no snow on your roof in winter when everyone else does! It can also get humid and condensate up there with the cold roof and warm attic, leading to mold. Have you ever been in an attic in the summer...? Hot as ballz!!! Imagine routing growroom heat to those existing temps! Pff talk bout an easy FLIR target! Anyway i always route through the attic AND then thru the roof. Its easy, if you wanna know how to do it the right way without any leaks, just pm me. Heres a pic from up in the attic of a place i did. The rigid duct goes thru the roof and connects to an umbrella cap. I sealed it using a 4" modded to 6" roof pipe flashing. I then sealed flashing with roofing cement and silicon. I sealed the inside with silicone just as a precautionary measure.

I agree, to a certain extent. If one's grow has any size to it at all, exhausting your room atmosphere into the attic would definitely increase humidity levels considerably, not to mention one's electric/gas bills (trust me on that one!). Even then a thermostatically controlled attic fan would go a long way to solving that problem. However, if one had air-cooled hoods drawing air from outside the house with vent tubes and then exhausting into the attic in a closed loop system, one would not be adding any more humidity to the attic than what is already at outside levels. As for the extra heat, again a thermostatically controlled attic fan or even a wind-turbine type roof vent would eliminate most, if not all, additional heat, but isn't really necessary. To prove it, take a drive around your town, especially sections with older homes, after the first light snowfall or hard frost. It is easy to see which houses have well insulated attics and which ones don't. For grows of your's and Badugi's size, I would think exhausting the growroom's atmosphere into a separate part of the house and a dehumidifier in the growroom (and possibly, one in the room being exhausted to) would be SOP. It will alleviate any heat signature and save a lot of money spent on energy bills!

Namaste, mess

 

[badugi]

Never thought venting to the attic would have so many side effects.

Site #1 uses two 8" Vortex's, each fan pulls through a 8"-to-6" reducer and three 6" ported hoods (1000w each). I'm drawing from the ceiling of the basement growroom, through the space in between the basement ceiling and first floor, pulling constant cool air from a different part of the basement and exhausting out the window. I don't think there's any real flaws one this one, but time will tell.

Site #2 uses an 8" Vortex at the window intake, feeding into a 12" pipe with 6" taps that feeds two rows of three 6" hoods. At the other end of the room is another 12" pipe with 6" taps, with a 12" Vortex blowing into the attic. The portable A/C's exhaust is also ducted into that system. I'm not positive but I am pretty sure there is no attic fan. (I really dislike this single-hose A/C unit. Need either a dual-hose, which will still probably suck, or a window unit + box. I was at first a little concerned about the 8" intake fan, instead of a 12", but it works out great.)

All of the air being pulled in and exhausted is used in a closed circuit duct system used for air-cooling lights only, as both rooms are sealed.

 

[messn'n'gommin']

Never thought venting to the attic would have so many side effects.

lol...Cause and effect! Ain't it a biatch?

Namaste, mess

 

[smurfin'herb]

Also, winter time has many benefits for us. Just pull cold outdoor air thru your lights and thru your room intake, and whalah, free a/c. You can aslo vent the hot growroom air that is exhausted (via carbon scrubber) into your house to reduce heating costs. You can also do this with the heat from your lights (if aircooled), and portable a/c's if u use them. But remember, when summertime comes back around, you better have some type of roof/window connections ready to exhaust all of that hot air out of the house, or else your central air will end up using as much electricity as your grow! And if you dont even have central air, then your really F'ed!