By continuing to use the website or clicking Accept you consent to our cookies and personal data policy. For details please see Privacy Policy
Accept
Do I really need a exhaust fan ?
SneakyDogstarted grow question 3 years ago
If my 2x2 grow tent sits at 26c and 68% humidity without an exhaust fan do I actually need one ? The top of my tent, the vent is open and I’ve opened the observation window at bottom to allow air in. I’ve two fans, one at canopy level and one in top corner opposite the top vent ?
Solved
Setup. Ventilation
like
CRiSPrGrowanswered grow question 3 years ago
always have an exhaust fan and always have it on. that's because it will help with mold and contaminants. it's pretty important.
Hempy_The_Kidanswered grow question 3 years ago
As DasBoof said, you can and will get mold. I just had mine not turning on and now I'm battling WPM. You need extraction to bring in new air.
2 likes
Complain
Robertsanswered grow question 3 years ago
You current situation would allow a fan with minimal use, while
providing fresh Co2 for your plants. Allowing to control order as well if you choose to filter it as well. I have been using 2, 4 inch smart controllers fans and they have been great for temp and humidity. Is a good setup. Good luck and happy growing 🌱
2 likes
Complain
Shaunmc57answered grow question 3 years ago
Exhaust fan are still usfull even if your not using it for temps, you can add a carbon filter to control the smell and it also renews the air in the tent so the plant has fresh c02
1 like
Complain
Similar Grow Questions
Solved
hweixd
How crucial is an exhaust fan and a carbon filter?I cant find anything in my country as a kit, but would buying them piece by piece work?
Example something like in the photo connected to an air duct and then to a carbon filter?
Or if the exhaust fan is not crucial? how can i get rid of the smell in a cheaper way?
Setup. Ventilation
3 months ago
2
Solved
GodOfAnger
ventilation for a 4x8 ? basically is that too much negative pressure and if so should I get anther intake ?currently using a 200mm inline exhaust fan that has 914 m3/h(537,9 cfm) max currently using it at its medium setting of 792 m3/h(466,15 cfm) and using a 125 mm inline intake fan with only 330 m3/h (194,23 cfm). Should I get anther intake fan or should I put the exhaust to low 680Other. General questions
Other. Other
Setup. Ventilation
4 months ago
1
2
Solved
GodOfAnger
Currently using a 4x8 tent in a garage that is dusty. would getting a extra intake be better for my plants?Currently using a 200mm inline exhaust with a max cfm of 537,96 and using a intake with a max cfm of 194. currently using the exhaust on medium setting so 466 cfm. would it be better for my plants to get more air from outside with a new but small intake of about 128 cfm ?Other. General questions
Setup. Ventilation
Setup. Other
4 months ago
1
1
Solved
RedArmC3PO
Carbon filter sleeve needed?I use the carbon filter on the exhaust side. On the intake side, I have a dust screen mesh.
The tent is quite clean so that’s why I don’t see the need of the pre filter. Would also probably load the inline fan a bit too.
What’s you thought?
Setup. Ventilation
4 months ago
5
4
Solved
CornerBud
Optimizing Airflow and Humidity in Grow Tent: Balancing Intake and Exhaust FansIntake fan: 180m³/h, exhaust: 340m³/h. Tent appears sucked in—is this problematic? Is equal airflow crucial? Struggling with seedling humidity; excessively dry (50-55%) when the humidifier is off. Need advice on balancing air circulation for optimal conditions.Setup. Ventilation
5 months ago
2
2
Solved
Kratistos
Hot situation hereI have some problems to keep tent cool. I use 2 led lights, they’re always hot, I tried with ventilation out or some fans but nothing changes. The only thing that I think it could work is raise the RH to keep kPa on point. What you think?Week 5
Setup. Ventilation
5 months ago
16
Solved
nonick123
Horario para el extractor y ventilador en armario durante la floraciónFloración: ¿Cuál es el mejor horario para el extractor y ventilador en armario (60x60x160 cm)?
Sigo el horario de imagen adjunta
No sé si debería encender más horas el extractor (145 m3/h), o si debería apagar el ventilador (20W) en algún momento
La intracción es pasiva
Week 6
Setup. Ventilation
6 months ago
13
6
Solved
Kenough
What is the importance of having a fan on 24/7?I have a question about fans, and more specifically how long does the fan need to be on? And is there a difference between having the fan on for 12 hours, 18 hours, or 24/7? I know I might as well leave it on 24/7, but the cheap-ass fan is kinda loud while I watch movies.
6 months ago
11
7
Solved
einamio
Fans at NightDo you run your fans in the dark or only exhaust ventilation?Other. General questions
Setup. Ventilation
6 months ago
7
6
Solved
PlantManagerTG
How am I doing? (1st indoor dwc grow)I’m using a bubble bucket and hydro ton , 1000watt hps bulb, two inline 6” 240cfm fans sucking out of the top port next to light, adjustable air pump, 4”x2” air stone. Haven’t decided on seed/nutrients yet.
Other. General questions
Setup. Ventilation
Setup. Other
6 months ago
3
6
Solved
puffies
Clip-On FanAt what stage of growth do you guys turn on your clip-on fan in the tent? I've heard that in the seedling stage, they shouldn't be used as it can damage the delicate stems/branches, so how late or how many weeks into veg would you say to wait before starting it up?Week 2
Setup. Ventilation
6 months ago
3
3
Solved
NonameGrowDude
grow tent / lung room temps???Dialling in my tent and want to compare to others to see if more ventilation = lower temps.
What temperature and humidity difference do you have in your tent and "lung room"?
Do you exhaust your air from the tent to the outside of your lung room?Setup. Ventilation
7 months ago
1
Solved
Melacola
HumiditéHumidité varie pas mal et j ai investi humidificateur mais sa ne résout pas le souci ventilateur 2 et deux entrés passive mais je pense trop de plans et je suis dans un endroit sous sol merci bien à vous l humidité n est pas bonne pour la floraison
Week 8
Setup. Ventilation
6 months ago
4
5
Solved
DFWmd
Dehumidifier recommendationsAny recommendations about a dehumidifier for the 4x4 grow tent? I think even with vacuuming run-off more frequently, I won't be able to get humidity consistently down below 60%. Amazon has some in the 45-90 USD range...Other. General questions
Setup. Ventilation
6 months ago
2
3
Solved
TioRandy
Humidity in a small tentHow to preserve optimal humidity in a small tent? My target humidity is 70 as I am germinating. My tent is 60*60*160. The smallest vent is on the picture I have attached (310 m3/h, 180PA). I have a Xiaomi Humidifier running on the maximum 24h, but still no help
Setup. Ventilation
7 months ago
12
9
