Difficulty figuring out how to ventilate.

OnePrays

OnePrays

Well-Known Member
So I'm currently doing a grow of 4 plants running on 150hps lamp which is called "Hydrofarm SBM150S 150-Watt Mini Sunburst with HPS Lamp" and also using a few cfls providing 350 watts of light. Here a link to the lamp. https://www.google.com/search?client=safari&hl=en&biw=320&bih=460&tbm=isch&sa=1&ei=FMPxU_2lFs6dygTvy4CQCg&q=Hydrofarm+SBM150S+150-Watt+Mini+Sunburst+with+HPS+Lamp&oq=Hydrofarm+SBM150S+150-Watt+Mini+Sunburst+with+HPS+Lamp&gs_l=mobile-gws-serp.12...0.0.0.176667.0.0.0.0.0.0.0.0..0.0....0...1c..51.mobile-gws-serp..0.0.0.EADuj6VzaxQ

The tent I currently own is a 6.6' x 4' x 2' and have one fan inside. I'm using a Holmes Blizzard Desk Fan. Great and strong fan. So the heat is constant 73-80 degrees and humidity 50-60 . So I've seen a few tuts and noticed most inline fans are connected to the lamps and the carbon filter. So how would I do that in my case since I can connect any ducting to my hps lamp? How would I add my
VenTech model # (IF4CF412) 4" Inline Duct Fan 190 CFM w/ Carbon Filter I have? Ofcourse I also have the ducting.
 
Abiqua

Abiqua

Well-Known Member
Well the 1st problem is that it doesn't have a duct connection. Passive cooling, small dc fan inside?

I would just suck out the air of the tent from an exhaust port, with a carbon filter on the inside of the tent being pulled thru by the fan.
Temps are good, so you might not need ducting even if you had it.

Just point an internal fan at the light, in case it gets hot later on down the road.

Big tent for such a little fan :)
 
nonamedman420

nonamedman420

Well-Known Member
could even use computer fans pointed at the lights to lower bulb temps. also vent hot air from the top of the tent, and cool air going in the bottom, will cause a chimney effect since heat rises. heat/smell removal is the hardest part of indoor horticulture
 
OnePrays

OnePrays

Well-Known Member
Abiqua said:
Well the 1st problem is that it doesn't have a duct connection. Passive cooling, small dc fan inside?

I would just suck out the air of the tent from an exhaust port, with a carbon filter on the inside of the tent being pulled thru by the fan.
Temps are good, so you might not need ducting even if you had it.

Just point an internal fan at the light, in case it gets hot later on down the road.

Big tent for such a little fan :)
Click to expand...
Then fan I have inside is pretty strong I have it on one and I feel like if I place it on lv 2 it might just rip leaves off! But the temps isn't that much of a problem I just want to know if the fan will help keep te humidity low? Also you think the inline can I have is too small? I read it would be plenty for 4 plants I didn't think id need a stronger one?
 
OnePrays

OnePrays

Well-Known Member
nonamedman420 said:
could even use computer fans pointed at the lights to lower bulb temps. also vent hot air from the top of the tent, and cool air going in the bottom, will cause a chimney effect since heat rises. heat/smell removal is the hardest part of indoor horticulture
Click to expand...
I'm not concerned on the smell android sure I'll keep a fan blowing at the light I'm just slightly trying to be prepared for the flowering stages since humidity levels are 50-60
 
tip top toker

tip top toker

Well-Known Member
If you do not extract air out of the tent, then little air will get into it. Plants need to breath just like you do. You cannot simply circulate air inside the tent, you need to actively replace it. Think of it like breathing in and out of a plastic bag. It's only gonna give you oxygen for so long before the air needs replenishing or you suffocate.

You need to pull air out of the top of the tent and allow fresh air to enter from the bottom. This will also lower the temperature of your tent.
 
OnePrays

OnePrays

Well-Known Member
tip top toker said:
If you do not extract air out of the tent, then little air will get into it. Plants need to breath just like you do. You cannot simply circulate air inside the tent, you need to actively replace it. Think of it like breathing in and out of a plastic bag. It's only gonna give you oxygen for so long before the air needs replenishing or you suffocate.

You need to pull air out of the top of the tent and allow fresh air to enter from the bottom. This will also lower the temperature of your tent.
Click to expand...
Hmm you're absolutely right and how would I go about extracting the how?
 
vostok

vostok

Well-Known Member
Upgrade that light to a 400w Mh/HPS leave inlet at the bottom passive with an appropriate grunty extract fan at the top, vented to outside, the 150HPS was and will always be shit, more heat that lux otherwise why add sidelights ....lol
 
tip top toker

tip top toker

Well-Known Member
OnePrays said:
Hmm you're absolutely right and how would I go about extracting the how?
Click to expand...
Simply hang an inline fan from the tents rails (assuming it is a sturdy good quality tent) and use a huge worm or duck tape or whatever to attach the tents top ventilation holes flap around the fan, or if needed, use a bit of suitable sized ducting between two.

You have to have ventilation. Even for humans, i mean, i imagine you've had one of those moments somewhere where you just feel it's really stuffy in here. You can't put a finger on the feeling, you just know it's not quite right, and you open a window, and despite no change in temperature etc, everything feels right again. fresh air. That was the phrase i was looking for :D
 
Abiqua

Abiqua

Well-Known Member
I thought the ventech was an exhaust fan, my bad. You need to exhaust and maintaining negative air pressure [sucking in] is just standard practice.

Temps are good inside, exhaust correctly and you shouldn't need to cool your 150w any more than right now.

But you will need an exhaust fan, the inline has no back pressure for the job and I mentioned an exhaust sleeve on your tent, because they should be setup at the highest point on the tent wall and intake should be down along the bottom.

If you want your carbon filter attached, attach it to the inside of the tent on the inlet of the exhaust fan and have it pull through.

This can help with humidity, but if you are drawing in unregulated air, shit will go up or down, just part of growing, unless you throw in a dehumidifier or A/C. :peace:
 
OnePrays

OnePrays

Well-Known Member
Abiqua said:
I thought the ventech was an exhaust fan, my bad. You need to exhaust and maintaining negative air pressure [sucking in] is just standard practice.

Temps are good inside, exhaust correctly and you shouldn't need to cool your 150w any more than right now.

But you will need an exhaust fan, the inline has no back pressure for the job and I mentioned an exhaust sleeve on your tent, because they should be setup at the highest point on the tent wall and intake should be down along the bottom.

If you want your carbon filter attached, attach it to the inside of the tent on the inlet of the exhaust fan and have it pull through.

This can help with humidity, but if you are drawing in unregulated air, shit will go up or down, just part of growing, unless you throw in a dehumidifier or A/C. :peace:
Click to expand...
So the ventech i got isn't an exhaust I thought it was. Uh oh. I can still use the ventech with te filter for as far as smell and humidity? Also I also have a co2 thing set up inside for the plants I'm using a natural way of providing co2 for the plants (water+sugar+yeast) doesn't provide a leathal amount I honestly think t doesn't provide enough fornit but I didn't do it the legitanate way as it seem a bit to complicated for me. Hmm so an exhaust fan I'll need does anyone know what those fans usually go around
 
Abiqua

Abiqua

Well-Known Member
OnePrays said:
So the ventech i got isn't an exhaust I thought it was. Uh oh. I can still use the ventech with te filter for as far as smell and humidity? Also I also have a co2 thing set up inside for the plants I'm using a natural way of providing co2 for the plants (water+sugar+yeast) doesn't provide a leathal amount I honestly think t doesn't provide enough fornit but I didn't do it the legitanate way as it seem a bit to complicated for me. Hmm so an exhaust fan I'll need does anyone know what those fans usually go around
Click to expand...
My bad again, the Ventech is an exhaust fan, I just saw the "inline duct" fan and thought it was something else without looking, So I was wrong!
http://www.amazon.com/VenTech-IF4CF412-Inline-Virgin-Charcoal/dp/B004Q2ER5C

Just attach it to the highest duct opening on your tent and stab the carbon filter inside. Co2 rooms are generally sealed, the small benefits you receive from DIY co2 will probably be lost with negative pressure venting!
 
Abiqua

Abiqua

Well-Known Member
The only way you can get your humidity to drop [without a dehumidifier] is to do something like 10 room changes of air a minute, but this will mean more watering of the plants.

Your cubic footage is just over 50cf. So with the Ventech you are getting little less than 4 changes a minute in air. It could be a tad higher, but if temp is good, then your golden.

Just have to adjust for humidity last, that is the toughest part......
 
greenlikemoney

greenlikemoney

Well-Known Member
OnePrays said:
Ahh okay that eases a lot of my kind that you.
Click to expand...
Imagine a HUGE grow operation, 100's of plants using ALOT of co2 with only minimal fresh air entrainment. That;s going to need co2 enhancement.

Your setup? not needed, you can stop with that part completely, although I will give you credit for reading about that, understanding the need your plants have for co2 and incorporating it into your setup. But it's not needed for what you are doing.
 
OnePrays

OnePrays

Well-Known Member
Abiqua said:
The only way you can get your humidity to drop [without a dehumidifier] is to do something like 10 room changes of air a minute, but this will mean more watering of the plants.

Your cubic footage is just over 50cf. So with the Ventech you are getting little less than 4 changes a minute in air. It could be a tad higher, but if temp is good, then your golden.

Just have to adjust for humidity last, that is the toughest part......
Click to expand...
I'm sorry but air changes? What exactly does that mean? As far as temps I'm not worried. It's always in the low 70s or mids.
 
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