The Grow Awards 2025 🏆

Chat

By continuing to use the website or clicking Accept you consent to our cookies and personal data policy and confirm that you are at least 18 year old. For details please see Privacy Policy and Terms

Accept

Recommended

Back to Grow Questions

Using humidistat to control fan, will this cause problems? So far fan running for 30 secs every two minutes! Plz advise if this is not a good idea??

Newbiegrower420started grow question 5 years ago

My exhaust fan is to powerful no speed control just two settings. On the lowest setting the fan is still sucking all the humidity that my humidifier creates out of the tent. So I have bought a humidity controller hooked it up with the humidifier and fan.. It’s working great!!

Solved

Setup. Ventilation

likes

The8thChevronanswered grow question 5 years ago

That will be plenty of air replacement. You should be able to buy a separate speed control for it though.

1 like

Complain

Selected By The Grower

Newbiegrower420answered grow question 5 years ago

Thanks all, I might invest in a fan speed controller anyway as I would prefer a constant flow of air extraction.. However this solution is working sweet for now.. Thanks for everyone’s support!! This website is truly awesome.. One❤️....

1 like

Complain

Chucky324answered grow question 5 years ago

Well done Newbie!

1 like

Complain

Mr_Weeds_Autosanswered grow question 5 years ago

If it's working and the humidity is staying under control then you should be fine my friend.

1 like

Complain

Similar Grow Questions

Solved

Seedling Air Circulation Im growing seedlings indoors in a window (they are only 7 days old) but ive been wondering at what point do the plants start needing circulating air? Found limited answers online, they will be going out to greenhouse once theyre big enough but for now do they need a fan?

Setup. Ventilation

5 years ago

4

5

Solved

New Light? Find a way to raise light? More Fans? Combination? (Light: 44" above ground level | Tent Height: 63" Day avg: 78.6f) Should i worry?What do you guys recommend as far as lighting for this tent? I have a 300w led light but at the height it's currently at it is producing a large amount of heat with my exhaust and two oscillating fans? I also have other plants in with my seedling so could the humidity cause it?

Other. Other

Setup. Lighting

Setup. Ventilation

5 years ago

2

Solved

RH 90% during Flowering!I have a problem with RH. I am at the 3rd week of Flowering and I'm struggling to keep my RH down. Today it was 90% when I opened the grow box. I have access only to a window. Is it better to suck air inside or blow the exhausted air out? I can't do both

Setup. Sensors

Setup. Ventilation

5 years ago

2

3

Solved

Exhaust fan/filter help!!!i installed a 6" exhaust fan and carbon filter. its trying to suck the entire tent up. i have one 4" vent hole. it isn't enough. what should i do? on a budget.

Setup. Ventilation

5 years ago

5

5

Solved

Looking for someone to look at my pics and give me advice on ventilation for mini grow room. Also if my plants look good for day 3? Any tips? Thanks!!!!Hi, wondering is you guys could look at my enclosure and give me some ideas as to when and how I should provide some air circulation to my seedlings? I plan to keep them in here for the next couple weeks like a small grow room. Also, do they look happy for day#3? Advice? Thanx

Setup. Strain - Autoflowering

Setup. Lighting

Setup. Ventilation

5 years ago

4

2

Solved

Overheat in tent? Measuring Correctly?HID lights on seedlings day 2 (25 cm dist.) I was alarmed by temperatures rising since yesterday to 35 despite exhaust & small fan inside tent. Tent doesn’t feel overly hot. moving sensor to above light it reads at a good 26-27. What’s the best way to understand tent temperature?

Setup. Ventilation

5 years ago

2

3

Solved

NEGATIVE / POSITIVE pressure Hi fellow growers.. I wont pretend to be a Pro nor an Amateur. Just willing to learn and progress.. 🙏😌 First question I have is one I've struggled with finding an answer too.. ......NEGATIVE / POSITIVE Pressure..... Which should I have? Why!

Setup. Ventilation

5 years ago

2

2

Solved

temperature i have a air problem, when my light are on my grow tent temperature reach 93F which is way to high, the humidity is perfect, what should i do to bring the temp down(how can i cool the air).... i have a carbon filter but when i start it,my humidity level drop...way to much...

Setup. Ventilation

5 years ago

9

3

Solved

4” filter upgrade help! Smell Hey guys, I’m wondering what is a good recommended 4” filter for my tent? I got one that came with a fan, ducting and the filter off eBay but the filter is the shits. I had it vented in the room but the smell was brutal. It’s vented out the window under my deck, reeks there now.

Setup. Ventilation

5 years ago

1

4

Solved

Carbon filter / ideal size for my tent.Hi all need info regarding carbon filters. My tents height 200cm , width is 120cm. Have tried to work out but no look. I have 4 plants in it. I need advice on which size to go for. I have tried to calculate myself but no joy. I am advised to get 6" but not sure ?? Thank you

Setup. Ventilation

5 years ago

2

3

Solved

BooBoosHotBoxCornGrow

AC/humidifier So I did get a humidifier/AC. Super cheap, $40. It seems to work. I’ve gotten it at 79-82 degrees and 45-50% humidity. I just have to keep filling the water part up every couple hours but I work from home in my room where it’s in my closet

Setup. Ventilation

5 years ago

1

Solved

BooBoosHotBoxCornGrow

Temp tent issue Nice! Thanks guys for the quick help! I’m also kinda sort of having a temp issue, I’m trying to make it the best I can, I’m way down south and the temp reads 86-88 a lot. If I blast the fans and humidifier it does get down but I’m worried about the electric bill going up.

Setup. Ventilation

5 years ago

3

3

Solved

So has anybody used these cordless mini dehumidifiers in their grow rooms? They’re small units that u charge over night every so often when the silica changes colour? My grow room is very small so an electric dehumidifier wouldn’t fit and I’m struggling to keep humidity down

Setup. Ventilation

5 years ago

1

2

Solved

Humidity 70%Guys, what do you think about this progress ? I tried to put humidity low but 70% is my best.. Any chances of future problems ?

Setup. Ventilation

5 years ago

2

1

Solved

What's a good dehumidifier for a small grow tent??What's a good dehumidifier? At the moment I'm only using those cheap little things but my humidity is staying at 60/65 and want it lower for flowering. My room ain't big 1.2m x1.2m

Setup. Ventilation

Setup. Other

5 years ago

2

Solved

Fan vs Fanless LEDs How effective are heatsink LEDs? I'm not sure if I should go with fanless (like Mars Hydro SP150) or with a fan (Mars Pro II Epistar 120). I struggle with heat, when the tent is closed it gets to 29-30 degrees with humidifier in full swing (HID lights) and I want to close it soon

Setup. Lighting

Setup. Ventilation

5 years ago

3

3

Solved

EthosMultipassMemberRovairok

Good [email protected]What's a good dehumidifier for around 300 or so I can't tell what's shit or what's good? Tr hat all say the same shit

Other. Other

Setup. Ventilation

Setup. Other

5 years ago

1

Solved

Temps to high....i think Hi, newbie here, I'm really struggling to keep temps below 30°C. Outside temps are not helping all, i have my extractor on full, air circulation fan on full, both flaps open, shed door even open lol and my light is turned down to 250 watts, which probably isn't high enough!

Setup. Ventilation

5 years ago

3

Solved

Smelly room, with filter should I be able to smell flowering buds?I have a 3x3 grow tent with a 4” fan and filter. The filter is in the tent and exhausts into the room. I taped the filter to the line and line to the fan so no pinhole leaks. The fan is rated for 198 cfm. I have it on low because when it’s high the smell is worse.

Setup. Ventilation

5 years ago

2

6

Solved

How to Lower Humidity The weather outside was really wet and chilly for days here and the humidity is about 60% at this point. Without a duct fan, how can I lower the humidity in the tent? I'm using several small fans right now. I plan to get a duct fan when I can, but I need something until then

Setup. Ventilation

5 years ago

3

4