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Venting into attic or roof vent?
- Thread starter Lubricus
- Start date
Id also like the 8'' fans to be connected to scrubbers will that work? (I'm still learning about scrubbers) I just picked up a used one for free before I connected any ductwork i put my 6'' vortex on top of the scrubber and Wow with in an hour no more stinky house! not bad for free a one!!
Roof vents are either passive or powered. Passive units use the heats natural tendency to rise (e.g. 130F air in the attic will be at a higher gradient than 120F air) and are placed towards the apex of the roof if it not a ridge vent itself. Also, the turbine type vents use the wind, to serve as a sort of fan, to aid that tendency and draw the hot air out of the attic.
Powered vents most often have an on/off switch and/or are connected to a thermostat and kick on at a predetermined temperature, much like growers use to cool a co2 charged, sealed room. They can be mounted towards the apex of the roof or installed in either of the gables at each end of the house.
With a larger grow, such as yours, you would probably be better served if you used the powered type to avoid humidity buildup and lessen impact of the room fan forced to overcome the added resistance of the extra ducting, if run to the vent itself, reducing it's effective CFM.
I would suggest a powered fan in the gable vents, as they are usually bigger and more powerful than the ones installed on the roof itself. This is just my take on it, and a rather simplified one at that, but someone else may have better idea's.
Namaste, mess
Powered vents most often have an on/off switch and/or are connected to a thermostat and kick on at a predetermined temperature, much like growers use to cool a co2 charged, sealed room. They can be mounted towards the apex of the roof or installed in either of the gables at each end of the house.
With a larger grow, such as yours, you would probably be better served if you used the powered type to avoid humidity buildup and lessen impact of the room fan forced to overcome the added resistance of the extra ducting, if run to the vent itself, reducing it's effective CFM.
I would suggest a powered fan in the gable vents, as they are usually bigger and more powerful than the ones installed on the roof itself. This is just my take on it, and a rather simplified one at that, but someone else may have better idea's.
Namaste, mess
Two 8" fans is pushing lots of air into the attic. You need to make certain that the attic has enough exhaust area to handle the air you are putting in. Many times there will be venting in the soffet and in the ridge cap, but it may not be near enough area to provide escape for the air you will be pushing in.
I agree with mng that a gable fan would probably be the best way to go. If there is no gable opening, it is something that can be done pretty easy, and cable vent covers can be found at HomedePot. Many homes have them, but no bent holes behind them. Yours may also...cut a hole there and put a gable fan behind it in the attic. Gable fans can be had fairly cheap, and are easy to hang.
Without enough exhaust vent for the air to escape, you hamper the grows air system and efficiency.
I agree with mng that a gable fan would probably be the best way to go. If there is no gable opening, it is something that can be done pretty easy, and cable vent covers can be found at HomedePot. Many homes have them, but no bent holes behind them. Yours may also...cut a hole there and put a gable fan behind it in the attic. Gable fans can be had fairly cheap, and are easy to hang.
Without enough exhaust vent for the air to escape, you hamper the grows air system and efficiency.
I'll take another look but I think there is four roof vents, and I believe there's venting in the soffit.
M
moses224
You could use a smaller 4" in attic to move air out soffits so it doesn't all build up over grow room....as long as airs moving it will get exhausted just make sure its filters...just my 2cents
What HoosierDaddy said, but if you install a powered vent (leeward side), you really should put a passive vent in the other end (windward side) as well, for cross-ventilation. They are fairly simple to install, but if you don't realy want to do it yourself have a buddy or relative that is fairly handy do it for a bit of "compensation." Other than that, Moses224 has a good idea too.
Just run the duct up towards the top of the attic and use zip-ties, or whatever you have on hand, to hold in place to draw the warmer air and exhaust out the soffit.
Just run the duct up towards the top of the attic and use zip-ties, or whatever you have on hand, to hold in place to draw the warmer air and exhaust out the soffit.
fishheadbob
Member
I like your idea about connecting to a roof vent and exhausting it directly to the outside, especially a roof vent at the top of the roof, not a vented soffit. You avoid the potential humidity buildup that could cost you a premature and expensive roof job . Doing it directly to a vent would require a little surfing on your part to figure out the details like length of run, size of ducting, turns and curves, etc . If you're in a cold climate. you also will look almost like you are on fire at times, maybe lots of steam.
I don't think it takes much to mount up a roof vent, fishhead. Just locate it above the grow on the roof, and after mounting it, run flex duct to the grow.
Venting out the soffet would be fine too, as it is direct to outside. Person could even fashion an incognito soffet vent for more flow.
Venting out the soffet would be fine too, as it is direct to outside. Person could even fashion an incognito soffet vent for more flow.
A
Amstel Light
i recently installed a solar powered roof exhaust fan on a neighbors house... dont know if it would provide enough movement? my question is and i hope this is not considered jacking? and i know it's not admissible but wont a flir image show a hot roof/attic if not properly vented?
maybe in the winter it would, but in the summer most attics are extremely hot! if i was pumping 800-900 CFM into my attic I would think the temps would be the same as my grow room 70-80F.
KlagDragon
Member
Unless you live at the approach to the same airport in major metropolitan city that the police choppers are operated out of. I can literally see the FLIR unit on the front of the chopper when they fly over on approach. I'd be really nervous if I was putting out a significant amount of heat.
Another thing to consider, I did some research a while back, and you can rent a handheld FLIR camera for fairly cheap. I found one on the internet that was $75/day. Not only good for verifying the stealth of your operation, but good for identifying inefficiencies in your home insulation that could save you lots on energy bills (unless you spend more on lights than heating and AC...).
In the case of my house we never use our fireplace and I've often thought that it would be very convenient to just duct heat out of there. Nothing suspicious about warm/hot air coming out of your chimney. Also, it's just a shit ass sheet metal pipe within a pipe, so it would be very easy to tap into.
fishheadbob
Member
Its a rental so making visible changes to the outside is something id like to avoid. I do have some roofing experience so changing a vent is nothing new to me, its just something id like to avoid if possible. I checked today I have five roof vents I was thinking about running the two 8'' into the attic and mounting a 6'' in the attic to one of the five vents or (T-ing it off) not sure if that's going to do the job or not?
I really wish I could use the chimney, but that could be dangerous
I really wish I could use the chimney, but that could be dangerous
SKUNK420
Member
i've done it before and it sounds like your house has a real attic so you should be fine.if you are still concerned about too much heat in the attic or back pressure then you'll have to run an extra fan like the others said. yes rentals do suck. i paid out my own pocket to replace central a/c condensor to avoid talking to landlord. i figured if they were about to spend over a grand on the a/c they might want to check out the rest of the house. which was not happening. i'm glad my rental days are in the past.
