Fan timer
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- fan & filter timer
SouthCross
Well-Known Member
I keep mine on. Constant air exchange (ventilation). The fans are for circulation of the exchanged air.
Without ventilation the same air is being pushed around by the fans. It's not fresh air.
Without ventilation the same air is being pushed around by the fans. It's not fresh air.
Lola Grows
Well-Known Member
No, you need constant ventilation & humidity control . You don't want stale air, I think that could lead to mold issues.
vostok
Well-Known Member
Weed ain't no C4 plant ...turn them off safe the cash
weed is C3 she don't save no C02
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3550578/
good luck
peracho
Active Member
OldMedUser
Well-Known Member
Any serious grower will have temp and RH controls on the exhaust fan. Without the addition of CO2 a grow space full of plants will exhaust the CO2 they need in a few minutes and just stop growing so it's fans on to draw in fresh air or add CO2.
What you want is a delicate balance between the heat generated by your lighting, the needs of your plants regarding heat, light and relative humidity and their need for CO2. Not easy to do just right but if you can keep it decent you shouldn't have problems.
Ideally the room air should be replaced 3 or 4 times each hour for a bunch of plants. A tent chock full of heavily vegging plants or plants in the stretch might need more frequent changes of air to keep up the pace and reduce heat and RH. The one time I manually blasted my grow room with CO2 during stretch blew me away how fast things grew.
With hundreds of plants under my belt I still strive to better my grow room environment and get the most out of my efforts.
Keep the oscillating fan on 24/7.
Good luck and good growing!
What you want is a delicate balance between the heat generated by your lighting, the needs of your plants regarding heat, light and relative humidity and their need for CO2. Not easy to do just right but if you can keep it decent you shouldn't have problems.
Ideally the room air should be replaced 3 or 4 times each hour for a bunch of plants. A tent chock full of heavily vegging plants or plants in the stretch might need more frequent changes of air to keep up the pace and reduce heat and RH. The one time I manually blasted my grow room with CO2 during stretch blew me away how fast things grew.
With hundreds of plants under my belt I still strive to better my grow room environment and get the most out of my efforts.
Keep the oscillating fan on 24/7.
Good luck and good growing!
orangeade5
Well-Known Member
Outtake fan not only provides fresh air but also keeps the smell down if you have a carbon filter hooked up. My poor inline fan never gets a break.
OldMedUser
Well-Known Member
You don't get your RH climbing in the dark like happens to me? Just evaporation off the surface of the pots is enough to get it way up around 80% according to my High/Low temp and RH meter.
Dr. Who
Well-Known Member
Yea but at night it's not affecting the plant like during the day - No photosynthesis to be effected! It should be taken care of by the first exhaust at lights on! The worry about RH can also be PM. Constant attention to RH is overseen by a proper sized dehumidifier. In a tent situation. You simply set a timer to run all lights on and then exhaust every 2 hrs for a cpl of min during lights out if your actually getting that problem.........I run some tents in my breeding area. They all shut off at an hr after lights out, and turn on an hr after lights on. I've got no problems in that place - tent or open room.
Secondly: If your gassing, the environmental controller is still doing it's job...Just not triggering gas to hit set levels in the dark.
Lola Grows
Well-Known Member
First you said just one exhaust at lights out & now you're saying every 2 hours ( if needed) thing is no 2 environments will be the same. Running a box fan in a hot tent during lights out won't cut it for everyone, not my tent I have to run the inline ( on low speed) the entire lights out or the humidity will rise to 80 ( with 2 regular fans running) Old Meds is right about this one. I tried what you said... the humidity almost knocked me out when I opened that tent.
Dr. Who
Well-Known Member
Reset it to shut down an hr after the lights out and try it like that.... I give a 2 hr method for those who fear RH for PM reasons. The plant and the RH, have very little to do with each other at night! RH is a photosynthesis regulator that is linked to the temp, and only has impact effect during lights on or when the plant is photosynthesizing.
First you said just one exhaust at lights out & now you're saying every 2 hours ( if needed) thing is no 2 environments will be the same. Running a box fan in a hot tent during lights out won't cut it for everyone, not my tent I have to run the inline ( on low speed) the entire lights out or the humidity will rise to 80 ( with 2 regular fans running) Old Meds is right about this one. I tried what you said... the humidity almost knocked me out when I opened that tent.
I also control my RH by dehuey.....I understand tents can be great, I use them for specific use, in a specific place. Mine run as stated. hr after lights out and restart for the day, an hr after lights on. I'm doing it like nature does at night. Initial drop and a rise to a dew point in the mourning. I don't get a "dew" but you get the idea, right?
For production. Exhaust only cycles to pull Co2 into the room.....RH is controlled by dehuey - 24-7....Different place altogether.
Lola Grows
Well-Known Member
Ok , I'll try this .Reset it to shut down an hr after the lights out and try it like that.... I give a 2 hr method for those who fear RH for PM reasons. The plant and the RH, have very little to do with each other at night! RH is a photosynthesis regulator that is linked to the temp, and only has impact effect during lights on or when the plant is photosynthesizing.
I also control my RH by dehuey.....I understand tents can be great, I use them for specific use, in a specific place. Mine run as stated. hr after lights out and restart for the day, an hr after lights on. I'm doing it like nature does at night. Initial drop and a rise to a dew point in the mourning. I don't get a "dew" but you get the idea, right?
For production. Exhaust only cycles to pull Co2 into the room.....RH is controlled by dehuey - 24-7....Different place altogether.
Lola Grows
Well-Known Member
I'm here to learn new things. It's forever changing and I would like to stay updated, so I'm open to doing things different.
peracho
Active Member
Gasing ? I need all the info I can get. I love to be informed. Greatly appreciated
Dr. Who
Well-Known Member
Using Co2.