Fresh air/fan cycle. Fresh air all the time?


#1

Hey all, not sure if this is the best section for this question, but my question is related to cycling fresh air for the plant. I will say that I have no issue with light escaping through any portion of the fan or vent tubing so that is not an issue.

I have an inline fan with carbon filter for my grow tent. My question is, does the plant, through young veg to bloom, does it need a constant flow of fresh air through it’s entire life or should I put the fan on similar to the light cycle

Currently I have the light set to 18 hours on and 6 hours off. Should I keep the fan on the same cycle or should I just have the fan on for 24 hours a day at a low speed? Currently I keep the fan off while at work, but when I get home, I turn it on for a few hours then turn it off for bed. Overall, the fan/filter cycle is about 20 hours off 4 hours on.

Thanks all


#2

@kyberky I have my fan on 24/7 higher speeds during the light cycle to reduce heat. Then back to low during lights off.
Also when the fan shuts off, and no air flow, as your girls mature, they’ll be a little smellyier. Having the fan in all of the time, keeps the smells away.
Happy growing.


#3

young seedlings need little air movement, 4 hrs a day is plenty,
during veg they need to be swaying in the breeze all day,
in the flower stage they need fresh air almost 24/7 to keep bud rot at bay.!!
this is for your circulating fan/fans, the ventilating fan/s can be run to keep an ideal environment.


#4

Yeah, I have heard the smell becomes an issue - I can already smell it in the tent when I get home haha. Just wasn’t sure if I am wasting electricity having it run all day for a plant that is roughly 4 inches in diameter and about 4 inches tall. When it gets a bit bigger and starts to really grow up I will go ahead and leave it on longer. I appreciate the info, thanks guys!


#5

i have been w/o an exhaust fan for the first 4 weeks of my plants. this is my first grow. but i’m not installing the filter for my veg tent at all. i have a humidifier and a fan blowing in the door of tent to help keep humidity up and temp down. in my flower tent i will have exhaust fan with filter. listen to @Covertgrower and @SlowOldGuy , @kyberky both are very knowledgeable and a great help!


#6

You’ll have to check this out, might be beneficial. Love mine and it’s quiet.

AC Infinity CLOUDLINE T4, Quiet 4” Inline Duct Fan with Temperature Humidity Controller - Ventilation Exhaust Fan for Heating Cooling Booster, Grow Tents, Hydroponics https://www.amazon.com/dp/B06ZXWN3BG/ref=cm_sw_r_cp_api_i_cc-ICbD2137ZD


#7

With the fan running 24/7 is serving to purposes your pulling hot stale air out also pulling fresh air in. And also creating a negative pressure inside tent so odor does not Escape. Good luck


#8

That is a sweet looking fan. I purchased an iPower fan and duct set. It is pretty dang quiet at medium-low but once you get to high it gets pretty audible. I mean, for the price, it isn’t terrible and I expect it to make a decent amount of noise. So it sounds like 24x7 won’t hurt anything and neither will 12 hours a day. Thanks all, appreciate the help.


#9

It is very, even on high I can’t hear it at all once my tents closed. I like that you can’t set a high temp and a low temp. So it’ll slow down if it’s too cold. Mines in my basement so automation is key because I live in a very cold area.


#10

I was reading more about that fan and that will definitely be my next. Question though, have you had experience with using the temperature control module and coupling it with a speed controller or does the temperature terminal have an option for speed control?

Update: NM, I am dumb, I just had to read some more hah


#11

I was wondering what type of fan to use on the fresh air that I am trying to blow into the tent. Do You blow it in from the vent at the bottom of the tent ?


#12

Do you have an inline fan hooked up to remove air from the tent?
On my set up I just use the passive vent/s on the bottom of the tent opposite of where my inline fan exhausts air so while it is running (mine runs 24/7) it forces fresh air to be drawn in from screeened vents on tent. I also hooked up a 4” piece of duct to a lower round 4” opening plus the screened vent gives me plenty of fresh air while maintaining a slight negative pressure on the tent.

Hope this helps,

HAGD