Fans during night time?
- Thread starter formypleasure
- Start date
formypleasure
Member
What percentage of humidity is risky for developing mold?
jondamon
Well-Known Member
It ultimately depends where you measure your RH.
I've experienced botrytis with an ambient RH of 55%. The issue was that micro-climates developed between leaf surfaces and amongst the plants causing RH spikes upwards of 75%.
Ideally keep RH below 65% during veg and circa 40-55% during flower.
I have 2 RH gauges in my room to give me a better picture.
Good air movement and airflow is critical if you suffer with high RH due to your location etc.
J
jondamon
Well-Known Member
Intake fans don't need to be run 24/7.
Or did you have a type-o and meant exhaust?
J
colonuggs
Well-Known Member
depends on your strain and the type of buds its produces...stagnant air and 50%rh with some strain can cause bud rot
formypleasure
Member
Is it true that AF are more resistant to pest and mold?
Mr John
Active Member
Not only is air circulation vital, nobody mentioned with fans on at lights off Will help give you the much needed temperature drop your ladies need.
waterdawg
Well-Known Member
I think op said that he was going to run recirc fans just not the intake/exhaust, or did I miss something. Actually warm air holds more moisture than cold, but yes, the hygrometer will register a higher number when temps drop, the air is getting to the limit, in a percentage, that it can hold. Thats why bring in cold fresh air (even with a high humidity) is a good thing. My room is always around 60% but never gets above 75F so never had issues. As the temps drop the air can no longer hold that moisture so it condenses on plants. I do agree that humidity control is important but cost is also a great concern for myself. My issue is odour and then I need to keep room in a negative 
.
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Cobnobuler
Well-Known Member
I agree that for many, cost issues are of great concern. But there is nothing so nasty as bud rot. It ( for me ) is one aspect of growing I must address at whatever the cost to avoid it.
It usually involves running ( and emptying ) my dehumidifier 24-7. At least in flower anyway. During veg I can let the RH rise without much concern.
It usually involves running ( and emptying ) my dehumidifier 24-7. At least in flower anyway. During veg I can let the RH rise without much concern.
formypleasure
Member
Many thanks for the help, didnt think so many ppl are willing to help. 
radrolley
Well-Known Member
it's kinda hard to get away with no noise. if your going to have noise for 12-18 hours a day then i wouldnt worry about having it 24/7. plus fans are a nice constant relaxing sound. i sleep better with fan noise to cover up other annoy background noises.
you really want to have a lot of air circulation at all times or you can risk powdery mildew. the only way to prevent mildew without a lot of air circulation is keeping your temps high at all times but then you are at higher risk of hermaphrodite traits. warmer part of the year i prefer a completely sealed controlled room with a co2 generator, AC, dehumidifier. colder part of the year instead of an AC i use outside air intake then exhaust the hot air outside because it uses less electricity. this is where a water cooled co2 generator can come in handy. it may need to run a lot because of the constant air exchange. if you can convert your co2 generator to burn natural gas instead of propane. it is so much cheaper. the setup is expensive but you will make your money back in no time. besides that if your doing it legally the neighbors cant say shit.
no matter what your setup, always have oscillating fans circulating air.
you really want to have a lot of air circulation at all times or you can risk powdery mildew. the only way to prevent mildew without a lot of air circulation is keeping your temps high at all times but then you are at higher risk of hermaphrodite traits. warmer part of the year i prefer a completely sealed controlled room with a co2 generator, AC, dehumidifier. colder part of the year instead of an AC i use outside air intake then exhaust the hot air outside because it uses less electricity. this is where a water cooled co2 generator can come in handy. it may need to run a lot because of the constant air exchange. if you can convert your co2 generator to burn natural gas instead of propane. it is so much cheaper. the setup is expensive but you will make your money back in no time. besides that if your doing it legally the neighbors cant say shit.
no matter what your setup, always have oscillating fans circulating air.
bird dog
Well-Known Member
Since your grow box is 2x2x5, you might consider purchasing two small 3" or 4" inline duct fans (@$15 ea) and a couple feet of vent hose. They are super quite if you spend an bit extra. Run one fan ion the front side of the grow and the other on the back. The front pushes air in and the back one pushes air out. Good luck. PeaceHello, i have problem with noise during night.
Can i turn off fans just for 6h during night as my building is shit and i literally can hear when my neighbor farts.
Growbox is 2x2x5 feet, one autoflower in it and temperature of living room where box is oscillate from 62/77 F night/day, still havent look for humidity during nights but during day it is betwen 40/65.
blowincherrypie
Well-Known Member
When the lights turn off the humidity will almost go up exactly as the temps drop it seems... Plus, I imagine most of us would have some serious stank issues if we turned off the fans at night... Ya dig?I think op said that he was going to run recirc fans just not the intake/exhaust, or did I miss something. Actually warm air holds more moisture than cold, but yes, the hygrometer will register a higher number when temps drop, the air is getting to the limit, in a percentage, that it can hold. Thats why bring in cold fresh air (even with a high humidity) is a good thing. My room is always around 60% but never gets above 75F so never had issues. As the temps drop the air can no longer hold that moisture so it condenses on plants. I do agree that humidity control is important but cost is also a great concern for myself. My issue is odour and then I need to keep room in a negative
blowincherrypie
Well-Known Member
I have had inline fans be louder than my can fans no joke.. I hate those pieces of crap, but I feel your logic..
waterdawg
Well-Known Member
If you read my post thats what I kind of said. Moisture in air is the same. But the percentage of moisture that air can hold goes up. I never said turn off fans is a good thing, just extraction may or may not be required, air movement is a good thing.