Exhaust fan for grow room help please!

coreywebster

coreywebster

Well-Known Member
Purplehaze, you hang your extraction fan with bungies or straps to the tent poles at the top (can be outside the tent if needed), you extract through the highest hole using ducting .Your filter if you use one wants to be as high as possible. You may want to measure your outlet holes on your tent to be sure you can fit the fan you require in there first. There is no need to use an intake, use passive. If you put an intake on and you have limited vents then you will restrict the outtake to whatever the intake is. If you are not venting out of your room its going to get hot. If you use an aircooled hood you can run a separate fan for that or the same fan.
Extraction is to remove heat and smell but more importantly to exchange air. You need to exchange air to allow more Co2 into the tent. A plant needs light, food and co2 without those 3 you cant grow. Co2 is air is only at the minimal level for cannabis plant growth so without air exchange the co2 depletes quickly and plant growth will halt. Unless of cause you add Co2 by other means which would be pointless in your situation.
There is no way to know how much the extraction will bring your temps down, its all related to ambient temps and without air con its a tough one. Most of the time you will probably be fine, just in the height of summer you may struggle. Make sure you have lights on in the coldest part of the day, like 8pm-8am depending on what light schedule your running.
Good luck with the getting the set up tweaked.
 
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Purplehaze01

Member
Thank you so much for all the information! That's really helped so much! How much would a cool tube lower my light temperature by? Also how many lumens would I lose if I used a cool tube?
 
Arkitecht

Arkitecht

Well-Known Member
Hey bro! So I just went down the basement and snapped a few pics for you so you can get a visual idea about the great suggestions everyone here has been posting for you cuz most of them I use myself. I run a two tent set up and I was only able to take a pic of the inside of the veg tent cuz the lights JUST went out but not the flower, since its dark cycle at the moment. I run three ventilation lines all with variable control so I can change the fan speeds to adjust temp along with humidity as well. I have one 400 cfm filter attached to its own 6" hurricane fan for the flower tent (1000w)and then a 220 cfm filter attached to a 4" fan for veg (600wMH). Both exit the basement to the outside (installed all the duct work myself, was kind of a bitch but totally worth it). And the third 6" fan is used solely to cool the hoods. I have them all separate so that I have more control over the grow environment. I run my lights at night, it's where I get the most even temps over 24 hr period. On really hot days (90-100f outside which is a couple weeks in Oregon) my flower room does not get above 83f or so ambient with the 1000W light on, but what I have found matters the most (in my opinion) is the temperature at the canopy itself, and I use a laser thermometer for that which I got on amazon for cheap. And I keep the temp at the canopy between 74-78 and of course I have two - three fans in the tents to move air around as well. The link I posted is the one I use, works well. And I use the variable controls to adjust the fans to keep temps where I want 'em. And with my set up I originally had intake fans as well for the tents but found that I just did not need them, that the passive vents in the bottom of the tents were more than enough to get the airflow I needed. But that might be different depending on what brand tent you use since every garden is unique. There is also a post about how to keep things more quite, especially since this is gonna be in your bed room the link below has some great ways to keep your fans more quite, the first post would be a good idea for you in the link right below this sentence.

https://www.rollitup.org/t/quiet-the-neighbors-can-hear-you-sound-control-thread.122532/

Cheers and happy growing man I hope the pics help.


https://www.amazon.com/Etekcity-Lasergrip-774-Non-contact-Thermometer/dp/B00837ZGRY/ref=sr_1_2?ie=UTF8&qid=1468883174&sr=8-2&keywords=temperature+gun+infrared

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20160718_155128[1].jpg 20160718_155033[1].jpg
 
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Bubblin

Bubblin

Well-Known Member
Arkitecht said:
Hey bro! So I just went down the basement and snapped a few pics for you so you can get a visual idea about the great suggestions everyone here has been posting for you cuz most of them I use myself. I run a two tent set up and I was only able to take a pic of the inside of the veg tent cuz the lights JUST went out but not the flower, since its dark cycle at the moment. I run three ventilation lines all with variable control so I can change the fan speeds to adjust temp along with humidity as well. I have one 400 cfm filter attached to its own 6" hurricane fan for the flower tent (1000w)and then a 220 cfm filter attached to a 4" fan for veg (600wMH). Both exit the basement to the outside (installed all the duct work myself, was kind of a bitch but totally worth it). And the third 6" fan is used solely to cool the hoods. I have them all separate so that I have more control over the grow environment. I run my lights at night, it's where I get the most even temps over 24 hr period. On really hot days (90-100f outside which is a couple weeks in Oregon) my flower room does not get above 83f or so ambient with the 1000W light on, but what I have found matters the most (in my opinion) is the temperature at the canopy itself, and I use a laser thermometer for that which I got on amazon for cheap. And I keep the temp at the canopy between 74-78 and of course I have two - three fans in the tents to move air around as well. The link I posted is the one I use, works well. And I use the variable controls to adjust the fans to keep temps where I want 'em. And with my set up I originally had intake fans as well for the tents but found that I just did not need them, that the passive vents in the bottom of the tents were more than enough to get the airflow I needed. But that might be different depending on what brand tent you use since every garden is unique. There is also a post about how to keep things more quite, especially since this is gonna be in your bed room the link below has some great ways to keep your fans more quite, the first post would be a good idea for you in the link right below this sentence.

https://www.rollitup.org/t/quiet-the-neighbors-can-hear-you-sound-control-thread.122532/

Cheers and happy growing man I hope the pics help.


https://www.amazon.com/Etekcity-Lasergrip-774-Non-contact-Thermometer/dp/B00837ZGRY/ref=sr_1_2?ie=UTF8&qid=1468883174&sr=8-2&keywords=temperature+gun+infrared

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Seriously nice setup you've got there m8.
How do you like those tents? Any complaints? Been thinking about a gorilla for ages.
 
Arkitecht

Arkitecht

Well-Known Member
Bubblin said:
Seriously nice setup you've got there m8.
How do you like those tents? Any complaints? Been thinking about a gorilla for ages.
Click to expand...
Thanks for the kind words Bubblin. No complaints on Gorilla tents. I've owned my share of tents from different manufacturers over the years and to date gorilla has been the best one so far. The zippers are superior quality to every other tent I've used, they are thicker material, the poles are coated so they don't rust and built so they hold weight. But they are a good 2 to 4 times more expensive, but in my opinion for the quality and peace of mind 100% worth it.
 
Bubblin

Bubblin

Well-Known Member
Arkitecht said:
Thanks for the kind words Bubblin. No complaints on Gorilla tents. I've owned my share of tents from different manufacturers over the years and to date gorilla has been the best one so far. The zippers are superior quality to every other tent I've used, they are thicker material, the poles are coated so they don't rust and built so they hold weight. But they are a good 2 to 4 times more expensive, but in my opinion for the quality and peace of mind 100% worth it.
Click to expand...
They're not cheap that's for sure but I agree, quality is worth it. I killed one tent in 9 months or so, err well I didn't really kill it, the zipper ripped out at the seam and there was so many light leaks that 1/4 the tent was covered in duct tape. Finally just moved everything that was in it to a closet.
 
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Purplehaze01

Member
My exhaust fan is making the rest of my room (outside the tent) cooler, I have it at the top of my tent (in a hole) and pushing air outwards.. I was wondering if maybe using it as a fan pushing air inside (instead of pushing air outwards) will just cool everything down inside the tent.. Would'nt it? It doesn't seem to be doing much pointing out from the tent
 
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Purplehaze01

Member
But yeah it's like 47 degrees celsius with the fan off and 42 degrees celsius with the fan on.. hardly much difference..
So what do you think I'll need now? It really is rediculously hot where I am at the moment, it's never usually like this at all
 
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Purplehaze01

Member
How much will that lower my temp by? Would I finally be good to go after that? Also is there a way I can lower the sound of the exhaust fan? xD
 
Arkitecht

Arkitecht

Well-Known Member
About 6 posts up or so I wrote a post for you with some links, pics and all that good stuff :). Yes, air cooled hood will lower your temps.
 
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Purplehaze01

Member
I can't vent the air outside my room but I heard insulated ducting can quieten the sound.. Do you think I should get some insulated ducting just to help quieten the sound? Will that work? (I really can't vent anything out of my room) and so an air cooled hood should be all I need to get good temps right? I don't want to buy it and then it's still not enough because my only option then would probably be to vent it out of my room which I can't do
 
Arkitecht

Arkitecht

Well-Known Member
Yup air cooled hood and I posted a link on how to quiet the fan as well. Should do the trick. Happy growing bro:eyesmoke:.
 
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