Humidity issues.

W

willisbrow

Well-Known Member
So I’m starting my indoor grow again after a 8 year break. I have a 5.5’x5.5’ box with mars hydro fc800 and a 6” inline exhaust fan with a carbon filter. I also have a dehumidifier and some circulating fans. The box is build in my basement garage which is very humid 70%sh RH.
I’m not having issues with the lights on. Heat goes up and RH goes down. But when the lights are off my RH gets to the low 60s%.
I think what happening a that my dehumidifier is working but the exhaust fan is exhausting all the dry air that my dehumidifier made and it is sucking in the air in the garage which is very humid.
I’m not sure the size of the dehumidifier (I’m can’t remember bought it 10 years ago).
I was looking at a 50 pint dehumidifier that says it’s good up to 4500 square foot rooms
That’s what’s going on. Anybody out there growing in super humid areas have any ideas on how to get my humidity down to 35-40% during lights off?
 

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That doesn't make sense. The hotter air should make more humidity due to the air being thinner, and more room for vapor molecules. Colder air is more dense, and should lower your RH. HOWEVER!.. you lights are not on burning up some of the water vapor. This is why RH rises during lights out...especially if you just fed/watered earlier that day. They are transpiring. This is just me, but I'd try to make your whole garage a lung room.
 
DoubleAtotheRON said:
That doesn't make sense. The hotter air should make more humidity due to the air being thinner, and more room for vapor molecules. Colder air is more dense, and should lower your RH. HOWEVER!.. you lights are not on burning up some of the water vapor. This is why RH rises during lights out...especially if you just fed/watered earlier that day. They are transpiring. This is just me, but I'd try to make your whole garage a lung room.
Click to expand...
sciencing.com

How Temperature & Humidity Are Related

Temperature and humidity affect the Earth's weather and the health and comfort of its residents. Relative humidity describes the percentage of water vapor in air that changes as air temperature changes. Dew point refers to the temperature at which air reaches saturation by water molecules.
sciencing.com sciencing.com
 
MICHI-CAN said:
sciencing.com

How Temperature & Humidity Are Related

Temperature and humidity affect the Earth's weather and the health and comfort of its residents. Relative humidity describes the percentage of water vapor in air that changes as air temperature changes. Dew point refers to the temperature at which air reaches saturation by water molecules.
sciencing.com sciencing.com
Click to expand...
I suppose Relative Humidity and Humidity are 2 different things.
 
DoubleAtotheRON said:
I suppose Relative Humidity and Humidity are 2 different things.
Click to expand...
Not really. It's called RH because the water vapor in the air is dependent on temp. Warmer air holds more moisture than cold air. So if you've got a jar of 60% RH air in a Mason jar at 80 degrees and lower the temperature of the jar to 50 the RH will rise since the cold air can't hold the moisture as well. That's just my stoner explanation, :lol:
 
PadawanWarrior said:
Not really. It's called RH because the water vapor in the air is dependent on temp. Warmer air holds more moisture than cold air. So if you've got a jar of 60% RH air in a Mason jar at 80 degrees and lower the temperature of the jar to 50 the RH will rise since the cold air can't hold the moisture as well. That's just my stoner explanation, :lol:
Click to expand...
Same as relative oxygen level to sea level is displayed by you?


And I campaigned for your appointment to mod. OOPS!
 
PadawanWarrior said:
The absolute humidity can change depending on temp. That's why we go by relative humidity.

And what do you mean campaigned for me? I don't qualify anyways, :lol:.
Click to expand...
I agree. Stick your head in your freezer and breath deeply for 2 minutes. Oxygen and humidity will help clear the head.

I posted my nominees on status. Ripped down fast. Too funny. But you and bk. More fun than a few now.
 
willisbrow said:
So I’m starting my indoor grow again after a 8 year break. I have a 5.5’x5.5’ box with mars hydro fc800 and a 6” inline exhaust fan with a carbon filter. I also have a dehumidifier and some circulating fans. The box is build in my basement garage which is very humid 70%sh RH.
I’m not having issues with the lights on. Heat goes up and RH goes down. But when the lights are off my RH gets to the low 60s%.
I think what happening a that my dehumidifier is working but the exhaust fan is exhausting all the dry air that my dehumidifier made and it is sucking in the air in the garage which is very humid.
I’m not sure the size of the dehumidifier (I’m can’t remember bought it 10 years ago).
I was looking at a 50 pint dehumidifier that says it’s good up to 4500 square foot rooms
That’s what’s going on. Anybody out there growing in super humid areas have any ideas on how to get my humidity down to 35-40% during lights off?
Click to expand...
Glad you know we are fools afoot of late. I do apologize. I would suggest sealing off the room and then another smaller hallway type space to dehumidify. S maller space requires less money and electric to control. My thoughts. Again apologies.
 
MICHI-CAN said:
Gulping slurpies is the only time my brain let's my mouth catch up!

And you know better.
Click to expand...
Your sig reminded me of that mite to remember thread. Funny shit man.

a mite to remember

Folks growing organically can't just dry out the soil like using bottled nutes. So we bring in predator mites/miles/beetles ect. You want to use beer and food coloring is an ole school hack .. fuck if I care.. I still can't believe you have gnats zipping around your house .. that would drive me...
www.rollitup.org
 
PadawanWarrior said:
Your sig reminded me of that mite to remember thread. Funny shit man.

a mite to remember

Folks growing organically can't just dry out the soil like using bottled nutes. So we bring in predator mites/miles/beetles ect. You want to use beer and food coloring is an ole school hack .. fuck if I care.. I still can't believe you have gnats zipping around your house .. that would drive me...
www.rollitup.org
Click to expand...
Still have them damn orchids. And a gnat or three. Was fun trolling with lore of ole.

And that is it?
 
DoubleAtotheRON said:
That doesn't make sense. The hotter air should make more humidity due to the air being thinner, and more room for vapor molecules. Colder air is more dense, and should lower your RH. HOWEVER!.. you lights are not on burning up some of the water vapor. This is why RH rises during lights out...especially if you just fed/watered earlier that day. They are transpiring. This is just me, but I'd try to make your whole garage a lung room.
Click to expand...
I wouldn’t say my RH rises when lights go off. My garage has a RH of around 70% and so does my grow box with nothing running(lights and dehumidifier) And when the lights go ON and the RH drops to 40% or so. Then when the lights go off my box goes back to the RH of the garage it’s in.
so…. The rh drops with the lights and heat on and goes back up when the lights go off.
 
willisbrow said:
I wouldn’t say my RH rises when lights go off. My garage has a RH of around 70%. And when the lights go ON and the RH drops to 40% or so. Then when the lights go off my box goes back to the RH of the garage it’s in.
so…. The rh drops with the lights and heat on and goes back up when the lights go off.
Click to expand...
This is totally different than what you said in the first place.
 
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