Exhaust fan

Ayokiwi717

Well-Known Member
You are going to have all sorts of issues.
Thanks for the positivity. I grew once before with even less ventilation and I still got an ounce. I just want them to produce something and stay alive. They have been doing fine. I will do it next grow. I just want to actually get something compared to just spending.
 

vitalsine

Well-Known Member
Thanks for the positivity. I grew once before with even less ventilation and I still got an ounce. I just want them to produce something and stay alive. They have been doing fine. I will do it next grow. I just want to actually get something compared to just spending.
I hear you but that logic doesn't really make sense. You're going to use the same amount of power to grow a plant wrong as you will growing it right, except that growing it right pays dividends. With the right gear, a will to learn, and a good head on your shoulders, you can turn a 2000-2500 investment into something much more. In a tent the size you're running, you could grow a few pounds pretty easily... do that 3 times a year and you've now grown like 10lbs of weed worth 10x your initial investment, even if you can only do 1lb at a time, one grow pays for everything... If you're doing it right the electricity costs are negligible. If you just half-ass it and don't approach it seriously you're going to get one ounce off a plant and spend more on electricity and gear than you will ever get back... that's why some people just don't grow weed, otherwise everyone would grow it. I have a friend who spent 2k on lights and built a make shift tent and is using box fans with no exhaust... like I just don't get the logic of some people haha. He's gonna get shit off his grow because he is cutting all these corners and trying to be a cheap ass. Make the sacrifices that are necessary to achieve your goals, or you will fail and eventually give up. Just my 2 cents.
 

NukaKola

Well-Known Member
If you want healthy plants you absolutely need an exhaust. It is essential. Plants need fresh air to replenish CO2 levels. A dehumidifier may lower your humidity but it won't supply the plants with necessary CO2. It would be like locking yourself in a room with a heater and air conditioner. Yes, you may not get hot or cold but that won't matter if you suffocate from lack of Oxygen.

I use an intake & exhaust fan to control my humidity during the day by bringing in fresh outside air when the humidity outside is low. During nighttime when humidity outside is high, I use a dehumidifier to control the humidity inside my grow space while my fans draw in fresh air occasionally to cool my grow space and replenish CO2.
 

Theghosty

Member
Thanks for the positivity. I grew once before with even less ventilation and I still got an ounce. I just want them to produce something and stay alive. They have been doing fine. I will do it next grow. I just want to actually get something compared to just spending.
Hey.. Sae this post, peeped it a little and just want to state my peace.. hope it helps..

Humidity control will always start with proper airflow.. I like 3 levels of circulation..
A small 12" or so floor fan in the tent , rotating and blowing across the floor towards the plants.. then on opposite side of tent, corner fans in each corner facing towards the floor fan, im middle of canopy but angled towards the sides of the tent.. then top layer above canopy, on same side of floor fan, blowing towards middle fans, and also towards middle of canopy..
I Prefer the exhaust duct right above the ballast for the lights high up in the tent.. on the floor, open flaps, and an optional duct booster fan pushing air into the tent, this should have a filter on it.. Google them, not hard to find.. the exhaust fan should give slight negative pressure on the tent.. it should slightly suck in..
This brings in fresh ambient filled C02 , low humidity fresh air.. you should have no problem being at 45- 50% with this setup.. if not, a cheap humidifier will work.. I would always get my airflow dialed before I got a dehumidifier.. you need fresh air and replacement ambient C02..
If you buy a dehumidifier only.. you just threw money at the problem and didn't create a long term solution to multiple challenges.
 

Ayokiwi717

Well-Known Member
I hear you but that logic doesn't really make sense. You're going to use the same amount of power to grow a plant wrong as you will growing it right, except that growing it right pays dividends. With the right gear, a will to learn, and a good head on your shoulders, you can turn a 2000-2500 investment into something much more. In a tent the size you're running, you could grow a few pounds pretty easily... do that 3 times a year and you've now grown like 10lbs of weed worth 10x your initial investment, even if you can only do 1lb at a time, one grow pays for everything... If you're doing it right the electricity costs are negligible. If you just half-ass it and don't approach it seriously you're going to get one ounce off a plant and spend more on electricity and gear than you will ever get back... that's why some people just don't grow weed, otherwise everyone would grow it. I have a friend who spent 2k on lights and built a make shift tent and is using box fans with no exhaust... like I just don't get the logic of some people haha. He's gonna get shit off his grow because he is cutting all these corners and trying to be a cheap ass. Make the sacrifices that are necessary to achieve your goals, or you will fail and eventually give up. Just my 2 cents.
I def don't want 10lbs for many reasons... only hoping mabe 2-3 oz a plant, and only 4 plants. May work up to 6. I got a big tent for the possibility to grow more as time goes on, but for now, 4 is my max. I hope want I aim to accomplish is doable. I just need to cut a corner. I paid for better lights, a grow tent, a dehumidifier, and a temp and humidity gage this time. I just got to save a little. Can I keep my tent open? Is there another way to increase airflow without spending more? Like I said, I just got to make it for this grow.
 

Ayokiwi717

Well-Known Member
Hey.. Sae this post, peeped it a little and just want to state my peace.. hope it helps..

Humidity control will always start with proper airflow.. I like 3 levels of circulation..
A small 12" or so floor fan in the tent , rotating and blowing across the floor towards the plants.. then on opposite side of tent, corner fans in each corner facing towards the floor fan, im middle of canopy but angled towards the sides of the tent.. then top layer above canopy, on same side of floor fan, blowing towards middle fans, and also towards middle of canopy..
I Prefer the exhaust duct right above the ballast for the lights high up in the tent.. on the floor, open flaps, and an optional duct booster fan pushing air into the tent, this should have a filter on it.. Google them, not hard to find.. the exhaust fan should give slight negative pressure on the tent.. it should slightly suck in..
This brings in fresh ambient filled C02 , low humidity fresh air.. you should have no problem being at 45- 50% with this setup.. if not, a cheap humidifier will work.. I would always get my airflow dialed before I got a dehumidifier.. you need fresh air and replacement ambient C02..
If you buy a dehumidifier only.. you just threw money at the problem and didn't create a long term solution to multiple challenges.
Im not seeking a ling term solution. Im seeking a quick fix to cover me to accomplish the job. Think about when you guys started. Did all you guys pay 500-1000 dollars for a grow set up? Prob not. I got most of everything except that. I will risk that, like I did before. I cant risk the humidity. My humidity outside the tent i think is in the 60% range. Like I said in previous comments, I just got to do what will keep these guys alive and producing a decent amount. I dont need 5oz plants. I live in a humid state as well. Temp has so far been not one issue. I just cant see myself spending more money at this point. I just need to work with what I got. I hope others can understand the possision im in. Its not like I went cheap ive spent plenty so far
 

vitalsine

Well-Known Member
I def don't want 10lbs for many reasons... only hoping mabe 2-3 oz a plant, and only 4 plants. May work up to 6. I got a big tent for the possibility to grow more as time goes on, but for now, 4 is my max. I hope want I aim to accomplish is doable. I just need to cut a corner. I paid for better lights, a grow tent, a dehumidifier, and a temp and humidity gage this time. I just got to save a little. Can I keep my tent open? Is there another way to increase airflow without spending more? Like I said, I just got to make it for this grow.
Well as long as humidity is in check via dehu you should make it. But yea, you can leave tent open during lights on, sure. If it feels muggy in the tent or you notice condensation build up you def need more air tho. Not as big a deal in early veg but can get problematic quickly during flower.

And trust me I hear you on the budget... everything isnt always possible. One piece at a time makes sense. But like I told my homie, instead of dumping it all into lights he should have spread it out a bit more... live and learn... just dont get too discouraged if you dont get much or you run into pm/mold issues
 

NukaKola

Well-Known Member
Im not seeking a ling term solution. Im seeking a quick fix to cover me to accomplish the job. Think about when you guys started. Did all you guys pay 500-1000 dollars for a grow set up? Prob not. I got most of everything except that. I will risk that, like I did before. I cant risk the humidity. My humidity outside the tent i think is in the 60% range. Like I said in previous comments, I just got to do what will keep these guys alive and producing a decent amount. I dont need 5oz plants. I live in a humid state as well. Temp has so far been not one issue. I just cant see myself spending more money at this point. I just need to work with what I got. I hope others can understand the possision im in. Its not like I went cheap ive spent plenty so far
That's understandable. At least get a small amount of fresh airflow though, it doesn't need to cost a ton.

Get a used Dehu to control humidity, open your intake flaps on the bottom of your tent, and stick a cheap booster fan in one of the exhaust ports on the top of your tent. It has a variable speed controller on it. When the humidity outside your tent is high, turn the fan speed down low to get a small amount of air exchange and let then dehu lower the humidity. When the humidity outside the tent is in an acceptable range, turn the fan speed controller on to medium-high for more air exchange so you can control humidity with the fan and the dehumidifier won't have to work as hard.

Dehumidifiers use a lot of electricity, so being able to control humidity at times by just using an exhaust fan and passive intake will pay for the fan in no time just by the electricity you will save.

 

Ayokiwi717

Well-Known Member
Well as long as humidity is in check via dehu you should make it. But yea, you can leave tent open during lights on, sure. If it feels muggy in the tent or you notice condensation build up you def need more air tho. Not as big a deal in early veg but can get problematic quickly during flower.

And trust me I hear you on the budget... everything isnt always possible. One piece at a time makes sense. But like I told my homie, instead of dumping it all into lights he should have spread it out a bit more... live and learn... just dont get too discouraged if you dont get much or you run into pm/mold issues
Its all a learning process. I just saw a way to make a co2 generator with using bottles of soda, fish tubing, yeast, sugar, and warm water. Mabe that could be a cheap option of hopefully getting a little more co2. If I get more than an 1oz for two plants, I beat my record . First grow got mold and only got 15 grams out of 3 plants, that was the cheapest, the second success got me to 1 for two plants, once again not the best conditions nor expensive set up. The first cost me prob under 50 bucks, the next was 300, now this time it will be around 500 I think. The time I had mold I was growing outside, like I said my state is a muggy state
 

Ayokiwi717

Well-Known Member
That's understandable. At least get a small amount of fresh airflow though, it doesn't need to cost a ton.

Get a used Dehu to control humidity, open your intake flaps on the bottom of your tent, and stick a cheap booster fan in one of the exhaust ports on the top of your tent. It has a variable speed controller on it. When the humidity outside your tent is high, turn the fan speed down low to get a small amount of air exchange and let then dehu lower the humidity. When the humidity outside the tent is in an acceptable range, turn the fan speed controller on to medium-high for more air exchange so you can control humidity with the fan and the dehumidifier won't have to work as hard.

Dehumidifiers use a lot of electricity, so being able to control humidity at times by just using an exhaust fan and passive intake will pay for the fan in no time just by the electricity you will save.

The dehumidifier im looking at appearantly has a function were I can choose were I want the humidity, so hopefully that will cut cost.
 

chronnie49

Well-Known Member
I use a dehumidifier in flower because my humidity will be around 70 while lights are off if i dont use it. I Also use an 8 inch exhaust fan running 24/7 to control smell, temp, humidity and to provide fresh air.

I'm guessing you dont care about smell since you haven't mentioned
 
Last edited:

Theghosty

Member
Thoes of us that are successful with cannabis started with a plan to reach a goal..
If that meant spending 6k-10k or 2k.. the return on investment was the number 1 priority. Were trying to help you.
You would find more success if you listened to experience.
Have a good day, night and I wish you the best.
 

Romeo7701

Well-Known Member
You said you had a Dehumidifier setting out side your tent... If you had proper air flow you would not need
another Dehumidifier... You need to spend your money on a Exhaust system,,, but its you hard earned money
buy you another Dehumidifier,,, then later when you finally get your exhaust system and only have to use the
Dehumidifier on the outside of your tent that you already have and is payed for and you don't use the one in
your tent anymore... Then you'll know... I wish you the best and hope you get the OUNCE your hoping for.:wall:
 
Last edited:

Driver733

Well-Known Member
Its all a learning process. I just saw a way to make a co2 generator with using bottles of soda, fish tubing, yeast, sugar, and warm water. Mabe that could be a cheap option of hopefully getting a little more co2. If I get more than an 1oz for two plants, I beat my record . First grow got mold and only got 15 grams out of 3 plants, that was the cheapest, the second success got me to 1 for two plants, once again not the best conditions nor expensive set up. The first cost me prob under 50 bucks, the next was 300, now this time it will be around 500 I think. The time I had mold I was growing outside, like I said my state is a muggy state
You got mold due to lack of ventilation and high humidity. I had a friend who struggled with powdery mildew growing in his basement, absolutely refused to install exhaust fans or provide fresh air intake to the room, for two years this went on and on, with terrible yields, like an ounce per plant. Finally, this summer he installed exhaust fans and guess what? No more powdery mildew and yield has doubled.

We can only give you advice based on experience. What you do or not is up to you.

I take my ventilation seriously:
20201005_095152.jpg
 
Last edited:

Ayokiwi717

Well-Known Member
You got mold due to lack of ventilation and high humidity. I had a friend who struggled with powdery mildew growing in his basement, absolutely refused to install exhaust fans or provide fresh air intake to the room, for two years this went on and on, with terrible yields, like an ounce per plant. Finally, this summer he installed exhaust fans and guess what? No more powdery mildew and yield has doubled.

We can only give you advice based on experience. What you do or not is up to you.

I take my ventilation seriously:
View attachment 4725500
An ounce per plant is good. I just need to cover the money I put in. Next grow I can get a ventilator. Just got to make it this grow
 

Ayokiwi717

Well-Known Member
I use a dehumidifier in flower because my humidity will be around 70 while lights are off if i dont use it. I Also use an 8 inch exhaust fan running 24/7 to control smell, temp, humidity and to provide fresh air.

I'm guessing you dont care about smell since you haven't mentioned
Smell is not one issue
 

Ayokiwi717

Well-Known Member
You said you had a Dehumidifier setting out side your tent... If you had proper air flow you would not need
another Dehumidifier... You need to spend your money on a Exhaust system,,, but its you hard earned money
buy you another Dehumidifier,,, then later when you finally get your exhaust system and only have to use the
Dehumidifier on the outside of your tent that you already have and is payed for and you don't use the one in
your tent anymore... Then you'll know... I wish you the best and hope you get the OUNCE your hoping for.:wall:
The humidity is 60% outside my tent. The humidifier we have is old. Who knows how well it works. It needs to cover a huge space as well
 
Top