Air intake during night.

M

Mr.green75

Member
Hello all, I'm a couple weeks away from switching to flower. I'm in a 4x4 tent with 3 plants I'm scrogging.
My humidity has been pretty high, usually 65 to 70 rh with as much watering I do. I'm growing in coco.

I recently bought a dehumidifier for inside the tent, the dehumidifier can't keep up with the air exchange being it's also humid outside the tent.

I'd like to switch off the intake at night and minimize the exhaust to shut down the air exchange so to allow the dehumidifier to work at night. Temps will not be a problem. I'm curious if it's OK to turn off the air exchange during night?
 
SheeshM

SheeshM

Well-Known Member
Not sure if that will work. A DH uses heat to remove moisture so that heat is added to your tent. If you shut off air exchange, removing heat from the tent could be an issue. Whatever you do, make sure you have some air movement with fans.
 
M

Mr.green75

Member
SheeshM said:
Not sure if that will work. A DH uses heat to remove moisture so that heat is added to your tent. If you shut off air exchange, removing heat from the tent could be an issue. Whatever you do, make sure you have some air movement with fans.
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Thanks for the reply. I have 3 oscillating fans running at all times. The tent is in my bedroom that has a window ac to control the temps, any extra heat can be adjusted. I just want to make sure having no air exchange at night is not too unhealthy for the plants. At the very least less damaging than a high humidity during flowering.
 
Gond00s

Gond00s

Well-Known Member
always have my carbon filter on low thru the whole day and I have the other fan that kicks on just when the hps is on so it removes the heat better
 
M

Mr.green75

Member
Kingrow1 said:
Air exchange has the same effect as dehumidifying :-)
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Thanks for the reply. I understand the air exchange can lower humidity, however, the air outside the tent has high humidity, so it's only exchanging humid air for just slightly less humid air. I figure if I can turn off the intake and lower though not completly turn off the exhaust for the smell, the dehumidifyer can keep up with the reduced air circulation.


Gond00s said:
always have my carbon filter on low thru the whole day and I have the other fan that kicks on just when the hps is on so it removes the heat better
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Thank you, though heat is no problem for me, just humidity.
 
Kingrow1

Kingrow1

Well-Known Member
Mr.green75 said:
Thanks for the reply. I understand the air exchange can lower humidity, however, the air outside the tent has high humidity, so it's only exchanging humid air for just slightly less humid air. I figure if I can turn off the intake and lower though not completly turn off the exhaust for the smell, the dehumidifyer can keep up with the reduced air circulation.




Thank you, though heat is no problem for me, just humidity.
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No you view humidity wrongly, the plant can happily handle those humidities but without exchange it can stagnate and build and thats no bueno.

I meant both defeat this not that moving wind lowers humidity. Mj is specialized to grow in many humidities no problem so thats not really a problem :-)
 
M

Mr.green75

Member
Kingrow1 said:
No you view humidity wrongly, the plant can happily handle those humidities but without exchange it can stagnate and build and thats no bueno.

I meant both defeat this not that moving wind lowers humidity. Mj is specialized to grow in many humidities no problem so thats not really a problem :-)
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Gotcha. So it shouldn't be a problem having 65 to 75% humidity during flower as long as I have sufficient air exchange along with the fans?
 
Kingrow1

Kingrow1

Well-Known Member
Mr.green75 said:
Gotcha. So it shouldn't be a problem having 65 to 75% humidity during flower as long as I have sufficient air exchange along with the fans?
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Yes fine and a good exhaust should negate the need for fans generally although one pointed up is popular.

Ive had many tents small and big and all felt fresh and airy - no way molds getting ahold there and my humidities range from low to high.


On the opposite scale i got some water on a bud when watering and it went back under my hps in my tent - mold a few days later had to cut bud off. Dont sweat humidity so much, dehumidifiers are better placed in the room the tent is in same aa air cons and heaters not directly in tents, that makes you try to seal of fans and holes to make some microclimate and thats just plain wrong for us, great for mushrooms and stuff :-)
 
Gond00s

Gond00s

Well-Known Member
Kingrow1 said:
Yes fine and a good exhaust should negate the need for fans generally although one pointed up is popular.

Ive had many tents small and big and all felt fresh and airy - no way molds getting ahold there and my humidities range from low to high.


On the opposite scale i got some water on a bud when watering and it went back under my hps in my tent - mold a few days later had to cut bud off. Dont sweat humidity so much, dehumidifiers are better placed in the room the tent is in same aa air cons and heaters not directly in tents, that makes you try to seal of fans and holes to make some microclimate and thats just plain wrong for us, great for mushrooms and stuff :-)
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Also when growing with organic u really don't want it to be a separate climate
 
M

Mr.green75

Member
Kingrow1 said:
Yes fine and a good exhaust should negate the need for fans generally although one pointed up is popular.

Ive had many tents small and big and all felt fresh and airy - no way molds getting ahold there and my humidities range from low to high.


On the opposite scale i got some water on a bud when watering and it went back under my hps in my tent - mold a few days later had to cut bud off. Dont sweat humidity so much, dehumidifiers are better placed in the room the tent is in same aa air cons and heaters not directly in tents, that makes you try to seal of fans and holes to make some microclimate and thats just plain wrong for us, great for mushrooms and stuff :-)
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Sounds good, thank you for taking the time to answer everything. I'll keep the intake running at night.

Thanks to everyone else also.
 
Kingrow1

Kingrow1

Well-Known Member
Mr.green75 said:
Sounds good, thank you for taking the time to answer everything. I'll keep the intake running at night.

Thanks to everyone else also.
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I just hope you understand the scientific principles behind it all and see that there are exact answers to everything :-)
 
SheeshM

SheeshM

Well-Known Member
Mr.green75 said:
Sounds good, thank you for taking the time to answer everything. I'll keep the intake running at night.

Thanks to everyone else also.
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@Mr.green75, I have my dh outside the tent and I run a 4" duct using half of the dh output grill then into a low tent port. The DH lowers the rh in the whole room while sending some treated air right into the tent. It's easy to hook up, maybe something to consider.
 
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