venting to the same room

[alrightok]

Hello there, I am a long time lurker looking for a little advice input on a new project. From what I have read this community seems very respectful and nice . With that out of the way here is the situation.

In a new location i am goign to be running a cab, but there is no feasible way to vent the hot air outside of the room. What possible ambient room temperature increases can i expect with a 400 watt light run at night, with the windows open? How about a 600 watt? will there be much difference? What other ways can i keep the room temperatures down without the use of an electricity hungry ac? A fan in the room with the window open will help but i just want to get some input before I create a sauna or something horrible like that. Thanks

 

[hazeywonder]

Are you planning on air cooling the hood? If so with a 400 in a cab you should have to many problems just do skimp on passive air circulation in the cad.

 

[HappyHemphog]

If you have access to an open window, why can you not vent via said window?

 

[alrightok]

circulation in the cab will be good with a vortex 6in, so that is not a problem.

due to the posiitioning of the room, i dont want to have ducting hanging out the window, or building a frame and making the window unusable for just a 400 or 600 watt setup

 

[wickedpete66]

well unfortunately if you plan on growing during mid summer you will need an ac. If you can hold off till mid September then an open window will be fine. your best bet is to just vent out the window if possible especially if you aren't planning to put an ac in it any way/ All you need to do is just rest the ducting on the sill. The screen will hide it from outside. I grew for 3 years this way when my apt was on the third floor

 

[cobo]

circulation in the cab will be good with a vortex 6in, so that is not a problem.

due to the posiitioning of the room, i dont want to have ducting hanging out the window, or building a frame and making the window unusable for just a 400 or 600 watt setup

Just run the ducting above window or under it so as cant be seen from out side and with window open it will be blowing out .

 

[alrightok]

thanks guys, great input.... im thinking ill just have an exhaust quite close to the window.... also : If i had a fan by my door blowing air into my room that would create negative air pressure forcing air to enter from the hall way... thus always making air exit the window and not enter? (under regular conditions not super windy lol)

 

[70s_PotHead]

Cut a hole in the ceiling and dump it into the addit....

70s

 

[Guest]

I'm running a 400 Watt HPS system right now as we speak. My spare room is 9x11ft. I partitioned one wall off so grow is 9 feetx3ftx8ft, big area, but only using a portion of it for actual grow, see pics.

I vent into the same room. I have to since it is an apartment and the only window is on a common porch. Fan noise as well as possible odor makes the window not an option.

Your ambient temperature is the key. If it's cool enough outside(and it is here) and you can vent the rooms comnnecting to your grow room( I can), you'll be OK. I began my grow March 15th. I haven't had temps over 80 unless I wanted them there. Nights my grow goes to high 60's. My plants are doing pretty good IMO. I have a carbon scrubber exhausting in to same room. Fresh air duct(see in pics at bottom) blowing 250cfm into grow...and there is passive air available through a walkin closet I am using as an air plenum. Lots of fresh air in my system.

This being my first grow like this...I'm bummed that Summers here can be brutally hot and dry. I don't think I can have a grow in here in July August. Too fucking hot. A/C is a possible option, but window isnt good for that here. So I am sprouting seeds for an outside grow.

Good luck

Obli


Walkin closet is behind plants. It runs from about midway in the grow there to about 4 feet outside the grow(towards right as viewed below). I used cardboard for light baffles, plastic draping, etc. inside the closet. Air moves good through the closet, light doesnt. My grow isn't 100% light tight (That's a myth it needs to be 100%...along with plants won't grow in clear pots hehehehe). There are no big leaks and those that are there like staple holes, celing/wall junction, don't shine directly on plants or near them. Don't be sloppy though, try for 100% Duct with forced air comes out at floor level. Air can enter passively behind the plants through the slit in plastic. The scrubber is on this side of the light just out of view above the light. It exhausts to the right into the remainder of the room at about 5 1/2 foot level. The left wall is an unheated wall. That combined with heater in the nongrow part of the room allows me to have some degree of control over the heat. Relative humidity has remained between 30%-50%....staying around 40% 90% of the time. I am lucky on that score.


Plants are doing OK so far. Here is Ice#4 at 31 days of 12/12. I let them veg too long(33 days) really for this light and setup, etc. Ice#2 in left background is over 4 feet tall as is Aurora Indica#2 directly behind the Ice#4 in foreground.

 

[alrightok]

thanks alot for the feedback, im also living on the westcoast just a little north of usa so it doesnt get to incredibling hot here. I am definately going to be running the lights at night as well as having the exhaust as close to the window as possible... it will be coming out of a steath tupperware DIY muffler. I hope i can sleep in the room and its not upper 80s

 

[Maj.PotHead]

thanks alot for the feedback, im also living on the westcoast just a little north of usa so it doesnt get to incredibling hot here. I am definately going to be running the lights at night as well as having the exhaust as close to the window as possible... it will be coming out of a steath tupperware DIY muffler. I hope i can sleep in the room and its not upper 80s

as 70's suggested vent the exhaust into your attick it's only a hole to patch with wall spackling when your done, your temps will never be a problem in the same room ya sleep in. if you vent the heat into the same room that supplys the grows fresh air your kinda defeating the porpuse of venting the heat your cab will suck the heat back in through the air intakes . i run a 400w hps in a cab c25 style i have a aircooled hood i draw fresh sir from outside cab through ducting and hood and vent the lights heat into attick. my other fan hooked upto my carbon scrubber takes care of any ambient heat from the bulb being on. my scrubber is also vented into attick my hood has 6inch ducting outlets i used 4x6 reducer and 4inch ducting so i have 2 celing holes 4inch to patch when im done n/p. where i live it gets very very hot during summer i run my house a/c @78 degrees my cab stays 82-83 lights on @ 115+ outside

 

[Guest]

MajorPothead said in part
" if you vent the heat into the same room that supplys the grows fresh air your kinda defeating the porpuse of venting the heat your cab will suck the heat back in through the air intakes "

That is not always true. It isn't true for my grow which I described above. My 250cfm blower picks up air at floor level which is quite a bit cooler than air at the 5 1/2 foot level where my scrubber is exhausting. There is virtually no "recirculating" of warmer exhaust air.

Temp in my grow is 77.7F inside and outside in same room is 76.3F at the moment and it doesn't vary too much from that during the day. At night my grow goes down to mid to high 60's

Obli

 

[Guest]

thanks guys, great input.... im thinking ill just have an exhaust quite close to the window.... also : If i had a fan by my door blowing air into my room that would create negative air pressure forcing air to enter from the hall way... thus always making air exit the window and not enter? (under regular conditions not super windy lol)

If you cannot exhaust into an attic space( I cannot. I have an apt. above me), then you can put a fan on the floor blowing fresh air into the grow room. Air along the floor will always be cooler than air higher up. Sometimes quite a bit cooler. The warmer air in your grow room will rise and exit the room higher up near the top of the door. If the rooms that connect to your grow room are well ventilated, you should do fine, especially if you are north of the border

Obli